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System Optimizer Archives s

System Optimizer Archives s

Use Contig to optimize individual files, or to create new files that are contiguous. Disk2vhd Disk2vhd simplifies the migration of physical. Advanced System Optimizer (formerly Advanced Vista Optimizer) is a software utility for Archived from the original on 13 February 2012. Without any optimization option, the compiler's goal is to reduce the cost of Compiling multiple files at once to a single output file mode allows the.

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System Optimizer Archives s

November, 2020, b2000

July 2021, v2107

Version 2107 is a System Optimizer Archives s release with fixes for time synchronization, System Optimizer Archives s, vTPM, remote execution, Cracked Software Links - Download Cracked Softwares with Keys Free layout at lower resolutions, programdata path, import selections and template editing. The MDT plugin can now operate when MDT isn’t installed in its default location.

June 2021, v2106

Version 2106 marks a major update in the OS Optimization Tool and its journey to becoming part of the product downloads. All code has been ported to a production development environment, reviewed, rewritten, and updated, to align with VMware standards. Version numbering has been changed to year and month (YYMM) to align with VMware Horizon.

New functionality has been added to the OS Optimization Tool along with a companion Microsoft Deployment Toolkit plugin. Optimizations have been rationalized and organized to focus on settings that can improve performance while retaining user experience.

User Interface

The System Optimizer Archives s interface has been updated to a Clarity look and feel to bring the OS Optimization Tool into alignment with other VMware products. This uses a dark theme and has a new logo.

The Optimize screen has been cleaned up with the left-hand navigation removed and functionality merged into the main pane. System Information has been improved with OS build info has been added. The Analysis Summary Graph has been redesigned to simplify what is displayed.

Optimizations

The OS Optimization Tool version 2106 ships with built-in template version 2.0 which removes many optimization entries that were present in previous versions of templates.

  • Some of these optimizations carried out actions that were not needed because they did not change the default state of Windows.
  • Other entries disabled functionality in Windows that was potentially required for certain use cases.
  • Some settings forced a specific or limited user experience, while not really contributing to a performance gain. If desired these settings are better off applied through a group policy or Dynamic Environment Manager policy.

For a complete list of template changes see: https://techzone.vmware.com/resource/vmware-operating-system-optimization-tool-guide#template-updates

Optimization entries have been renamed to better describe the function and intention of the action. They have been logically grouped to make it easier to find items and allow the selection of a group or subgroup of related entries.

The template now as has new syntax option to control the group view and whether it is expanded or not by default.

All user registry values are now written to HKCU. They are then copied to the default user profile during an Optimize (unless that action is deselected in Common Options).

Microsoft Deployment Toolkit Plugin

The OS Optimization Tool now comes with a plugin for Microsoft Deployment Toolkit (MDT), System Optimizer Archives s as a separate download. This plugin allows you to use Microsoft Deployment Toolkit to automate the creation of your golden images and adds in custom tasks that can be inserted into MDT task sequences.

These custom tasks include:

  • Install Agents - VMware Tools, Horizon Agent, Dynamic Environment Manager, App Volumes Agent.
  • Run OS Optimization Tool tasks – Optimize, Generalize, System Optimizer Archives s, Finalize.

For JoyToKey crack serial keygen detail see https://techzone.vmware.com/resource/vmware-operating-system-optimization-tool-guide#microsoft-deployment-toolkit-plugin

A separate guide is being published that covers setup and configuration of Microsoft Deployment Toolkit for use with the OSOT plugin. See Using Automation to Create Optimized Windows Images for VMware Horizon VMs.

Changes

Firewall, Antivirus and Security Center are not selected to be disabled by default, System Optimizer Archives s. They can be disabled by selecting them in Common Options before running an Optimize task.

The Public Templates feature and tab has been removed.

  • Public uploaded templates were not validated by VMware.
  • Users can still create their own templates, and then export and import them using XML files to facilitate copying between machines.

The System Optimizer Archives s Analysis feature and tab has been removed.

The need to use third party utilities NSUDO, SetAcl has been removed and replaced with native code. These utilities were previously used due to permission challenges when changing certain Windows configurations.

Bug Fixes

Changed how the default background (wallpaper) is applied to resolve issues seen on later builds of Windows 10.

Resolved issue on later builds of Windows 10 where AppXPackages would not get disk drill mac crack Archives properly causing Sysprep to fail.

Changed how Antivirus (Defender) is disabled when selected to make this more reliable on later versions of Windows 10.

April 5, b2003

  • Resolved bug where Windows Store Apps were being removed even though they were being selected to be kept. This included changing the filter condition for Remove All Windows built-in apps.

March 2021, b2002

  • Fixed issue where the theme file was being updated by a Generalize task and the previously selected optimizations including wallpaper color were being lost.
  • The administrator username used during Generalize was not getting passed through properly to the unattend answer file. This resulted in a mismatch when using some languages versions of Windows.
  • Removed legacy code GPO Policy corruption
  • Removed CMD.exe box that displayed at logon.
  • Windows Store Apps were not being removed properly on Windows 10 version 20H2. Fixed the optimizations to cope with the differences introduced in this version.

Optimizations

Changed step Block all consumer Microsoft account user authentication to be unselected by default, System Optimizer Archives s. When disabled this was causing failures to login to Edge and Windows store.

Changed the step Turn off Thumbnail Previews in File Explorer to be unselected by default, System Optimizer Archives s. This was causing no thumbnails to show for store apps in search results.

Windows Update

On Non-Enterprise editions of Windows 10, KB4023057 installs a new application called Microsoft Update Health Tools: https://support.microsoft.com/en-us/topic/kb4023057-update-for-windows-10-update-service-components-fccad0ca-dc10-2e46-9ed1-7e392450fb3a. Added logic to ensure that the Windows Update Medic Service is disabled including after re-enabling and disabling Windows Updates using the Update tab.

Templates

Windows 8 and 8.1 templates have been removed from the list of built-in templates, System Optimizer Archives s. To optimize these versions of Windows, use the separate download for version b1130.

Removed old Windows 10 templates from the Public Templates repository:

  • Windows 10 1809-2004-Server 2019
  • Windows 10 1507-1803-Server 2016

January 2021, b2001 Bug Fixes

  • All optimization entries have been added back into the main user template. This allows manual tuning and selection of all optimizations.
  • Fixed two hardware acceleration selections were not previously controlled by the Common Option for Visual Effect to disable hardware acceleration.

Optimize

  • During an Optimize, the optimization selections are automatically exported to a default json file (%ProgramData%\VMware\OSOT\OptimizedTemplateData.json).

Analyze

  • When an Analyze is run, if the default json file exists (meaning that this image has already been optimized), this is imported and used to select the optimizations and the Common Options selections with the previous choices.
  • If the default selections are required, on subsequent runs of the OS Optimization Tool, delete the default json file, relaunch the tool and run Analyze.

Command Line

  • The OptimizedTemplateData.json file can also be used from the command line with the -applyoptimization parameter.

Optimizations

  • Changed entries for Hyper-V services to not be selected by default. These services are required for VMs deployed onto Azure. Windows installation sets these to manual (trigger) so these so not cause any overhead on vSphere, System Optimizer Archives s, when left with the default setting.

Bug Fixes

  • Resolved the issue that stopped automatic logon in Server and WVD edition after Sysprep process.
  • Resolved a reboot prompt problem which displayed in process of generalizing on Win10 1607 LTSB.
  • Resolved the issue of failing to disable anti-virus feature on Windows 10 2004.
  • Fixed issue where re-enabling Windows Update would pull down feature updates by default.

Common Options

  • Common options selections are now remembered between different runs of the OSOT.
  • For all tabs, user now can apply different Common Options settings multiple times on optimized system.
  • Under Update tab, introduce a new option to switch on/off update feature of Office 365, 2016, 2019
  • Under Store Apps tab, disable checkbox for removed built-in apps

Update

  • New option to defer or directly trigger feature updates
  • New option to defer or directly trigger quality updates
  • New option to skip Office Click-to-Run updates
  • Added commands to stop and disable the App Volumes services when re-enabling Windows Update. These are then set back to automatic when Windows Update is disabled again.

Optimizations

Added the ability to export and import selected optimization items on the Optimize page (Export Selections and Import Selections).

 

Changes:

  • Default for “Touch Keyboard and Handwriting Panel Service” is now unselected by default to resolve missed language bar issue.
  • Default for “Connected Devices Platform Service” is now unselected by default.

New:

  • Turn off account privacy notifications in Office 365 and Office 2019

Command Line

  • New parameter -ApplyOptimization to import a file that contains previously selected optimization items.
  • New parameter -OfficeUpdate to switch on/off update function of Office 365, 2016 and 2019.
  • New parameters (e.g. -AntiVirus, -Bitlocker, -Firewall, -SmartScreen) to control different options in security section of Common Options.

Templates

  • Removed built-in templates and support for Windows 7 and for Server 2008-2012. A separate download of version b1130 is available for use with those OS versions.

UI

  • Theme color has been changed to light grey

August, 2020, System Optimizer Archives s, b1170 Update

Templates

New combined template for all versions of Windows 10 and Windows Server 2016 and 2019. Optimizations can have optional parameters to filter the version that a setting is applied to.

Optimizations

Turn off NCSI is no longer selected by default as this was shown to cause issues with some applications thinking they did not have internet connectivity.

New Optimizations added and some removed, For details see: https://techzone.vmware.com/resource/vmware-operating-system-optimization-tool-guide#Template_Updates

Bug Fixes

Fixed issues with re-enabling Windows Update functionality on Server 2016 and 2019.

Fixed issue that was preventing Windows Antimalware from System Optimizer Archives s disabled properly.

Common Options

Changed interface and language on the Common Options page for Windows Update to remove confusion. This option can only be used to disable Windows Update as part of an optimization task. To re-enable Windows Update functionality, use the Update button on the main menu ribbon.

Guides

Updated OSOT user guide: VMware Operating System Optimization Tool Guide.

June, 2020, b1160

Windows Update
Brand new option called Update that make it easier to re-enable Windows Update functionality on a Windows image that has previously been optimized and had this disabled.

This process has the following four steps:

  1. Enable – Changes the required registry System Optimizer Archives s, local group policy and enables the required services.
  2. Windows Update – Starts the Windows update process and open the Windows setting page. You can run the Windows Update process as often as required and reboot, if necessary, before progressing to the next step.
  3. Restore – Returns all settings to their original values. This will also disable scheduled tasks that get regenerated when a Windows Update runs.
  4. Recommendations – After updating Windows, it is recommended that you rerun an optimize and then a finalize task.

Generalize
Completely redesigned interface that makes it easier to change the settings to customize the unattend answer file. These include:

  • Time Zone.
  • Input, System Optimizer Archives s, UI, and user locales.
  • Administrator account autologon and password.
  • Copy Profile.

You still have the ability to view and edit the generated unattend answer GraphPad Prism 9.2.0.332 Full Version, if required, before execution.
Added cleanup of the local administrator profile before performing a copy profile including deleting the following registry entries:

  • HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\FileAssociationsUpdateVersion
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations

Finalize
Commands added to disable App Volumes services, if installed, System Optimizer Archives s running the Finalize steps.
Common Options

Selections are now retained between runs. This makes it easier to rerun an optimize with the same common option settings.

Command Line
Standardization for the main command line options.

  • Optimize can be System Optimizer Archives s with either -optimize or -o
  • Generalize can be run with either -generalize or -g
  • Finalize can be run as either -finalize or -f

Optimizations
Remove optimizations that, while System Optimizer Archives s selected by default, can cause issues if selected:

  • CloudExperienceHost - CreateObjectTask (Disable Scheduled Tasks)
  • CacheTask (3 items)

Guides
Updated OSOT user guide: VMware Operating System Optimization Tool Guide.

April,2020,b1151

Fixed several issues in CLI.

April, 2020, System Optimizer Archives s, b1150
.docx file of recent change log located in the hyperlink above.

Includes various bug fixes and many new optimizations that have a huge beneficial effect.

Support for Windows 10 version 2004 has been added.

Optimizations

Lots of Windows 10 and Windows Server optimizations have been added to this version. These include settings for Windows features and also for applications:

  • Office 2013/2016/2019
    • Disable start screens
    • Disable animations
    • Disable hardware acceleration
  • Internet Explorer 11 and Edge browser
    • Blank home page
    • Prevent first time wizard
    • Disable hardware acceleration
  • Adobe Reader 11 and DC
    • Disable hardware acceleration
    • Multiple additional optimizations

More optimizations have been added for Windows services and scheduled tasks to achieve a faster OS initialization and improve performance.

UI Button Renames and Reorder

Several buttons have been renamed to more closely reflect the task they perform.

  • Analyze is now called Optimize.
  • The old page that displayed the results of an optimization task used to be called Optimize. That has been renamed to Results.

Inside the Optimize page the buttons at the bottom left have been reorganized. These are now in order that you would execute them in. Analyze > Common Options > Optimize

Removed the button for Compatibility as this was a legacy item.

The top-level buttons and tabs have been reordered to better reflect the main tasks and the order you carry them out in. Analyze > Generalize > Finalize.

Common Options

New option in Visual Effect to allow the selection of disabling hardware acceleration for IE, office and Adobe Reader. The default is that this is selected but this allows this to be easily unselected if using hardware GPU.

Added Photos to the list of Windows Store apps that can be selected to be retained.

Setting the background to a solid color is now selected by System Optimizer Archives s comprehensive Sysprep answer file that helps with some optimization CyberLink PowerDirector 19.6.3126.0 Crack + Serial Key Download that were getting undone by the Sysprep process.

Finalize

New options to carry out some tasks that get undone during Generalize.

  • Disable Superfetch service. This reduces high usage of CPU and RAM.
  • Clean temporary files from the default user profile.

Automate the use of SDelete to zero empty disk space.

  • Overwrites empty disk space with zeros so that the VMDK size can be reduced when it is cloned.
  • This uses SDelete which needs to be downloaded from Microsoft Sysinternals and copied to a location in the path (Windows\System32 or current user directory).

Create Local Group Policies

  • Creates local group policies for computer and user settings that can then be viewed with tools like RSOP and GPEdit.
  • This uses LGPO.exe which can be downloaded as part of the Microsoft Security Compliance Toolkit. LGPO.exe should be copied to a location in the path (Windows\System32 or current user directory).

Command Line

Command line support added for the Generalize step.

Command line support added for the Finalize step. This also simplifies and consolidates the previous system clean tasks (NGEN, DISM, Compact, Disk Cleanup) under the new -Finalize option. These can now be run without specifying a template.

Fixed naming of Paint3D application when wanting to retain this while removing other Windows Store Applications. This had been previously been incorrectly named as MSpaint.

Templates

Windows 10 version 2004 was added to the built-in template Windows 10 1809 – XXXX-Server 2019.

Legacy templates for Horizon Cloud and App Volumes packaging have been removed. The two standard Windows 10 templates should be used instead.

LoginVSI templates are no longer built in. They are still available to download from the public templates interface.

Guides

Updated OSOT user guide: VMware Operating System Optimization Tool Guide.

Updated Creating an Optimized Windows Image for a VMware Horizon Virtual Desktop guide coming soon.

January, 2020, b1140

Includes various bug fixes.

Optimize Results

A new button has been added to the results page System Optimizer Archives s displays once an optimization job has completed. This Export button allows you to save the results page as an HTML file.

Generalize

New option and button that simplifies the task of running Sysprep using a standard answer file. You can edit the provided answer file before running Sysprep with it.

Finalize

New option and button to automate many common tasks that are typically run as a last step before you shut down Windows to use the VM in Horizon. These include the system clean up tasks (NGEN, DISM, Compact and disk clean up) that were previously provided in the Common Options dialog. This also includes clearing event logs, KMS information and releasing the IP address.

Common Options

System clean up tasks have been removed from the common options so will now not run during optimize but instead should be run as part of the Finalize process.

New tab for Security options. This allows for the quick selection of common settings that might need to be left enabled depending on the security requirements. This offers control over Bitlocker, Firewall, Windows Defender, SmartScreen, HVCI.

Command Line

Added command line parameter to allow the tool to run without applying optimizations. This is part of the -o parameter called none that then allows you to run things like the system cleanup tasks (NGEM DISM, etc.) without also having to optimize at the same time.

VMwareOSOptimizationTool.exe -o none -t template -systemcleanup 0 1 2 3

WebCache

Changed default to not disable Webcache. In testing this was shown to break Edge and IE browsers ability to download and save files. The settings are still available in the Windows 10 templates if you want to disable Webcache.

Guides

Updated OSOT user guide: VMware Operating System Optimization Tool Guide.

Updated Creating an Optimized Windows Image System Optimizer Archives s a VMware Horizon Virtual Desktop guide coming soon.

December, 2019, b1130

Command Line

  • Added command line parameters to allow the control of the common options settings. This allows for the control of visual effect, notification, windows update, store applications, background and system clean up tasks, from the command line.
  • Added list of available templates to the output when run with -h (help).
  • Fixed issues with command line options.

The VMware Operating System Optimization Tool Guide has been updated to include instruction and examples on using the command line.

Visual Effects

  • Changed balanced setting (default) to leave Show shadows under windows enabled. This was making the white on white explorer windows blend in together which did not give the best user experience.

WebCache

  • Added optimization settings to disable WebCache processes from Windows System Optimizer Archives s. The default is that these optimizations are selected. This removes approximately 40 Mb from each users’ profile on creation and improves logon times.

Horizon Cloud Templates

  • Changed the two Horizon Cloud specific templates (Windows 10 and Windows 7) by removing the item “VMware DaaS Agent Service", System Optimizer Archives s. This is no longer required in Horizon Cloud Service.

December, 2019, b1120

Templates
Changed the two existing Windows 10 templates to also cover the associated Server OS and to introduce support for Windows Server 2019.
• Windows 10 1507-1803 / Server 2016
• Windows 10 1809-1909 / Server 2019
The old Windows Server 2016 templates have been removed.

System Clean Up

Added System Clean Up options to Common Options dialog. This removed the need for these to be typed and run manually.
1. Deployment Image Servicing and Management (DISM)
Reduces the size of the WinSxS folder by uninstalling and deleting packages with components that have been replaced by other components with newer versions. Should be run after a Windows update.
2. Native Image Generator (NGEN).
Optimizes the .NET Framework. Should be run after an update of .NET Framework.
3. Compact
Compact (Windows 10/ Server 2016/2019). Enables CompactOS to compress specific Windows system files to free up space. Can take several minutes to execute.
4. Disk Cleanup.
Deletes temporary and unnecessary files.

Background/Wallpaper

New Common Options page for Background which allows the choice of color using a picker. This also allows the option to allow the user to be able to change their wallpaper.

Visual Effects options

Added a third option where all visual effects are turned off apart from smooth edges and use drop shadows. This is now the default selection.

Windows Store Apps

New page in Common Options that allows more control over removing Windows Store Apps while allowing the user to select common ones to keep. The Windows Store App and the StorePurchaseApp are retained by default.

Applications that will be able to be selected to be kept are:
• Alarms & Clock
• Camera
• Calculator
• Paint3D
• Screen Sketch
• Sound Recorder
• Sticky Notes
• Web Extensions

Defaults

The small taskbar option is now no longer Exposure X5 Bundle [6.0.8.237] With Crack (Latest 2021) Free Download by default.
In both Windows 10/ Server templates the following services are now no longer selected by default.

• Application Layering Gateway Service
• Block Level Backup Engine Service
• BranchCache
• Function Discovery Provider Host
• Function Discovery Resource Publication
• Internet Connection Sharing
• IP Helper
• Microsoft iSCSI Initiator Service
• Microsoft Software Shadow Copy Provider
• Secure Socket Tunneling Protocol Service
• SNMP Trap
• SSDP Discovery
• Store Storage Service
• Volume Shadow Copy Service
• Windows Biometric Service

Numerous New Optimizations
• Fully disable Smartscreen.
• Disable Content Delivery Manager.
• Disable User Activity History completely.
• Disable Cloud Content.
• Disable Shared Experiences.
• Disable Server Manager when Windows Server OS.
• Disable Internet Explorer Enhanced Security when Windows Server OS (not selected by default).
• Disable Storage Sense service.
• Disable Distributed Link Tracking Client Service.
• Disable Payments and NFC/SE Manager Service.
Bug and error fixes
• Fixed condition when Export Analysis Results would fail to create file.

September, 2019, b1110

  • New Common Options button - Allows you to quickly choose and set preferences to control common System Optimizer Archives s. These would normally involve configuring multiple individual settings but can now be done with a single selection through this new interface
  • Split Windows 10 into two templates to System Optimizer Archives s handle the differences between the versions; one for 1507-1803 and one for 1809-1909
  • Improved and new optimizations for Windows 10, especially for 1809 to 1909.

Updated and changed template settings for newer Windows 10 versions to cope with changes in the OS, registry keys and functionality:

  • Move items from mandatory user and current user to default user
  • Add 34 new items for group policies related to OneDrive, Microsoft Edge, privacy, Windows Update, Notification, Diagnostics
  • Add 6 items in group of Disable Services
  • Add 1 item in group of Disable Scheduled Tasks
  • Add 1 item in group of Apply HKEY_USERS\temp Settings to Registry
  • Add 2 items in group of Apply HKLM Settings
  • Removing Windows built-in apps is now simplified. Removes all built-in apps except the Windows Store.

Numerous bug and error fixes:

  • Reset view after saving customized template
  • Unavailable links in reference tab
  • Windows Store is unavailable after optimizing
  • Start menu may delay after optimizing
  • VMware Tools stops running after optimizing
  • Analysis Summary Graph is cropped

July 30, 2018, b1100

  • Issue fix: With group selection operation, un-selected optimization items are applied.
  • Issue fix: can not export analysis report

July 20, 2018, b1099

  • Template update: Windows 10 & Windows Server 2016
  • Prevent the usage of OneDrive for file storage
  • Registry changes:
    reg add "HKLM\DEFAULT\Software\Classes\CLSID{018D5C66-4533-4307-9B53-224DE2ED1FE6}" /v System.IsPinnedToNameSpaceTree /t REG_DWORD /d 0 /f * reg add "HKLM\DEFAULT\Software\Classes\Wow6432Node\CLSID{018D5C66-4533-4307-9B53-224DE2ED1FE6}" /v System.IsPinnedToNameSpaceTree /t REG_DWORD /d 0 /f reg add "HKLM\DEFAULT\System\GameConfigStore" /v GameDVR_Enabled /t REG_DWORD /d 0 /f reg add "HKLM\DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\People" /v PeopleBand /t REG_DWORD /d 0 /f reg add "HKLM\DEFAULT\Software\Microsoft\Windows\CurrentVersion\GameDVR" /v AppCaptureEnabled /t REG_DWORD System Optimizer Archives s 0 /f reg add "HKLM\DEFAULT\Software\Microsoft\Windows\CurrentVersion\Notifications\Settings\Windows.SystemToast.SecurityAndMaintenance" /v Enabled /t REG_DWORD /d 0 /f reg add "HKLM\DEFAULT\Software\Microsoft\Windows\CurrentVersion\PenWorkspace" /v PenWorkspaceButtonDesiredVisibility /t REG_DWORD /d 0 /f reg delete "HKLM\DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run" System Optimizer Archives s OneDrive /F reg delete "HKLM\DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run" /v OneDriveSetup /F

    June 14, 2018

    • Issue fix: Crash in non-English locale (e.g. French)

    March 30, 2018

    • [Template] Issue fix - DELETEVALUE actions do not do anything
    • [Template] Issue fix - DISM commands missing /NoRestart switch
    • [Tool] Issue fix - Switching to another tab loses all unsaved changes
    • [Tool] Enhancement - Simplify user interaction in Template Editor. Now System Optimizer Archives s template no longer requires repeated Update button click. Mac style editing is applied (Automatically save changes along with edit)

    December 14, 2017

    • Template update. Detailed change log for each template is in the online version of each template (accessed from Public Templates tab)

    September 20, 2017

    • Supports new mode for optimization item: display-only
    • Supports more easy information retrieval. For example, installed product version, service current status

    August 2, 2017

    • New Template: App Volumes System Optimizer Archives s Machine - This template is intended to be used by Application Packagers who are responsible for creating AppStacks and should only be used on the 'Packaging machine'.

    June 5, 2017

    • Template Update (Windows 7/8/8.1/10/2016 Desktop/2016 RDSH/ 2008-2012) : "Remove Windows Desktop Update Setup" is unselected by default
    • Template Update (Windows 10): Delete item "Remove Mail", because "Remove Communications Apps" item can remove Mail App.
    • Issue fix: mistakenly reports new version available
    • Issue fix: Export Template: xml file Sketchup pro 7 crack serial keygen no format. Now the exported XML file is formatted with indentation.

    May 16, 2017

    • OSOT binary is now digital-signed, to make sure the integrity of distribution
    • Template update: Windows 10 - Item "Use small icons on taskbar" is unselected by default.

    April 27, 2017 b1090b

    • Issue Fix: "the node to be removed is not a child of this node" when opitimize windows 10 template
    • Issue Fix: System.NullReferenceException occurs if the network can't reach any of the public template repository.
    • Template Update (Windows 7/8/8.1): Correct the System Optimizer Archives s Show Delay type to REG_SZ in item "Reduce Menu Show Delay"

    April 18, 2017

    Issue fixed
      • Some optimization items are skipped mistakenly. For example, Remote Apps in Windows 10 template. This is caused by a recent change in Conditional Check feature.

    April 17, 2017 b1088

    Feature
        • Conditional Check: you can specify on what condition an optimization should be run, System Optimizer Archives s. For example, System Optimizer Archives s, when a specific registry key match certain value.
    Template
        • "Change Explorer Default View" has been changed to unselected by default, because of conflict to UEM. Details: it causes the locations in "user files" (desktop, downloads, favorites, music, videosDocuments, Pictures) folder is to the local drive c:\Users\Username, its Should be \\server\folder_redirection\%username% when use UEM folder redirection.
    Enhancements
        • Public Templates tab: click template on the list is very slow, which should not be
        • Default public template repository URL System Optimizer Archives s public template repository takes too long
    Issue Fix
        • Field validation: prevent user from creating template with blank name

    March 17, 2017 b1086

        • New template (beta): Windows server 2016 (RDSH)
        • New template (beta): Windows server 2016 (Desktop)
        • New template (beta): Windows server 2016 (Server)
        • New template: Windows 2016 (from LoginVSI.com by Omar)
        • Windows 10 template is no longer marked "Beta"
        • Update template (Windows 7/8/8.1/10): TCP Offload default is now Enabled (the same as Windows default). The reason of the original item was hardware limit. Today most of the hardware supports this feature well. So change this item back.
        • Enhancement: performance improvement for change log

    February 23, 2017

        • Feature: Template change log. Now user can see change log in Public Template Repository, and append change log when they publish new version of their own templates.
        • Command line mode: auto exit without key press (by simulating key event)
        • Documentation & example for command line (Reference from GUI)
        • Export template: new options: export as XML for importing to another OSOT
        • Import template: should not require restart to take effect
        • Fix issue: avoid unnecessary error dialog when non-template XML file exists in the "current directory".
        • New online service URL (Public Template Repository)

    November 2, 2016, Build b1084

        • Template update - Windows 7/8/8.1: Update item "Machine Account Password Changes - Disable" data from 0 to 1 (reg key DisablePasswordChange)
        • Template update - Windows 10: "Remove Apps" items default unselected, because removing those apps increases login time for local admin.
        • Program issue fix: Template comments from Fling site can not be shown.
        • Program issue fix: Rare case crash when switching tab during downloading template.
        • Program Enhancement [My Templates & Public Templates] - A new "website" field is available for System Optimizer Archives s templates, System Optimizer Archives s, so you can lead users of your template to your own site.
        • Program Enhancement [My Templates] - Show template id.
        • Program Enhancement [My Templates] - Add "View in Public Templates" button.
        • Program Enhancement [Public Templates] - Add textbox to show template description.
        • Program Enhancement [Public Templates] - Refresh button can refresh the comments now.

    September 30, 2016

        • A new template for Windows 10 is included (from LoginVSI.com)
        • Issue fix: Crashes on history tab when the local system time format is not default.

    September 27 2016, Build b1082

    Template Update

        • Windows 10: Updated "Remove Apps" items, so sysprep can work properly now.
        • Windows 10: Remove item "Device Association Service", because disabling the service leads to more logon time.
        • Windows 10: Make item "Remove Microsoft Internet Explorer Initialize Setup" unselected by default, so as to fix issue: unable to edit Trusted Sites in IE 11.

    Program Fixes

        • Apply HKCU Settings to Registry" items can not optimize success on windows 10 with Framework 4.5.
        • Sometimes the application hangs when executing shell command based optimizations (e.g. bcdedit.exe).
        • Editing Schedule Task causes "Error - Sequence contains no elements". 


    Program Enhancements 

        • Update command line support. Now you can analyse/optimize with specified template Transformers War For Cybertron Full Crack input validation
        • Add "Import Template" feature. Now you can import previous XML template easily
        • You can simply put an XML with the OSOT executable System Optimizer Archives s, and the tool will list the template (in My Templates category).
        • You can use 3rd party exe to in optimization items. To do so, create a shell command based optimization item, specify the absolute path of the exe file, or relative path of the exe file if you put it in the same directory as OSOT exe.
          • Example format: "cmd.exe /c <absolute_or_relative_path_to_your_exe> <parameters_use_double_quotation_mark_if_necessary>"

    Update August 18 2016, Build b1080

        • You can share customized templates to the community, and download/comment templates shared by others.
        • Redesign of local template repository. Now there are three template categories managed: VMware Fling templates, System Optimizer Archives s, Downloade templates, and my templates. You can create new template based on existing template.
        • New template: Windows 10 template for Horizon Air Hybrid 4. Updated templates: Windows 10 beta, Windows 7 5. GUI update: fix bugs and improve performance for template editor

    Update System Optimizer Archives s 24 2016, Build b1072

        • New template: Windows 10/Horizon Air Hybrid
        • Hide technical items in analysis/optimization view

    Update April 26 2016

    This version includes an "Export template" function, which enables the capability to export a template in a human readable format, as an one-file HTML. It also eliminates the duplicated effort in creating lots of sections in our user manual.

    Update March 31, 2016

    All templates: Windows 7/8/8.1/2008/2012/10

        • Theme optimization is not selected by default. So after default optimization you will still have pretty looking Windows GUI.
        • Optimize sound schema. Disable Windows sound effects.
        • Items in the "Improving Login Time" group now have more meaningful names.

    Windows 7

        • "Action Center Icon - Disable" now works for both current user and new user
        • Turn off "Computer Maintenance"

    Windows 8/Windows 8.1

        • "Action Center Icon - Disable" now works for both current user and new user
        • Turn off "Computer Maintenance".
        • Add "Set Default Wallpaper" item to "Apply HKCU Settings to Registry" group

    Windows 10

        • "Action Center Icon - Disable" now works for both current user and new user
        • Turn off "Computer Maintenance"
        • Add "Set Default Wallpaper" item to "Apply HKCU Settings to Registry" group
        • Add "Disable UAC" group
        • Change "Device Association Service" and "Device Setup Manager" item default unselected.
        • Items in "Remove Apps" group now also applies to new users
        • New items in "Remove Apps" group:
          • Remove Candy Crush Soda Saga
          • Remove Communications Apps
          • Remove Maps
          • Remove Twitter

    New items in "Apply HKCU Settings to Registry" group:

        • Advertising ID
        • Cursor Blink
        • Cursor Blink Rate
        • Default Printer
        • Lock Screen Title Migrate
        • Menu Show Delay
        • On Screen Keyboard - Key Stroke Delay
        • On Screen Keyboard - First Repeat Delay
        • On Screen Keyboard - Next Repeat Delay
        • Pocket Outlook Object Module(POOM) - Work Rsult
        • Pocket Outlook Object Module(POOM) - Run Cookie
        • Preview Desktop
        • Show me tips about windows
        • Smart Screen
        • Speech, inking ,& typing setting - Implicit Ink Collection
        • Speech, inking, & typing setting - Implicit Text Collection
        • Speech, inking, & typing setting - Contacts
        • Speech, inking, & typing setting - Privacy Policy
        • Start Menu App Suggestions
        • Sync language
        • Tablet Mode Auto Correction
        • Tablet Mode Speel Checking
        • Tablet Mode Taskbar Icons
        • Taskbar buttons
        • Taskbar Navigation
        • Taskbar Size
        • Taskbar Small Icons
        • Taskbar Task View Button
        • Unified Store
        • Unistore
        • USB

    New items in "Apply HKLM Settings" group:

        • Boot Optimize Function
        • Customer Experience Improvement Program - Disable
        • First Login Animation

    New items in "Disable Scheduled Tasks" group

        • Shell - IndexerAutomaticMaintenance

    New items in "Disable Services" group

        • Bluetooth Handsfree Service
        • Downloaded Maps Manager
        • Encrypting File System(EFS) Service
        • Microsoft (R) Diagnostics Hub Standard Collector Service
        • WAP Push Message Routing Service
        • Windows Biometric Service

    New System Optimizer Archives s Windows 7 (Horizon Air Hybrid)

    Bug Fix & GUI Update

        • Bug Fix:
          • Template editor: change between steps will cause field value overwritten

    Template editor

        • Add System Optimizer Archives s click menu: up and down
        • Resize description box within container
        • Change Registry Type from textbox to combobox

    References

        • Add link to optimization guide
        • Add Optimization Estimation Result link

    Analyze

        • Auto analysis on app open
        • Alert When optimizing using incompatible template

    Update February 17

        • [Optimization] [Win10] changed "Device Association Service" and "Device Setup Manager" item in "Disable Services" group not selected by default. Optimizing these two items will lead to error when adding devices. Select them according to your own need.
        • [Optimization] [Win10] update optimization items in "Remove Apps" group, System Optimizer Archives s. Removed app will not appear for new users.
        • [Optimization] [Win8.1/10] add "set default wallpaper" item
        • [Optimization] [Win10] add "Disable UAC"
        • [GUI] Template editor: change "Add Action", add registry type to combo box
        • [GUI] Template editor: auto scroll to new added group or step
        • [GUI] Template editor: add "Add Group" button and "Add Step" button

    Update Jan 4 2015

        • Windows 10 template (beta)
        • Login time optimization, System Optimizer Archives s, for Windows 7, Window 8, Windows 8.1.
        • Visual effect correction, now works for both current user and new users. This change applies to Windows 7, Windows 8, Windows 8.1.
        • Some items are not selected by default, for better compatibility or user experience. You can still select them on demand.
        • A reference tab is added for OSOT Fling home site, as well as other optimization materials.
        • Drop old product support (View 5.3).
        • UI enhancement: optimize product compatibility settings.
        • Issue fix: When UAC is enabled, System Optimizer Archives s, incorrect message shows in command line mode.

    [Optimization Items]

          ​​
        • Windows 8: hide fast user switching
        • Windows 8: disable welcome screen
        • Windows 8: change item recommendation level: Disable Windows Update service: recommended -> Optional. Update description.
        • Windows 7 & 8: System Optimizer Archives s item: "Disable IPv6", according to https://support.microsoft.com/en-us/kb/929852
        • Windows 7 & 8: Add optional item to disable visual effects. By default these items are NOT selected.
        • Windows Server 2008-2012: add item to disable Windows Update service.

    [Template & GUI]

        • Windows 7-8 template has been separated into two templates.
        • Template is automatically selected based on the target OS (for both local analysis and remote analysis)
        • MasterTemplate is removed
        • Remove description column in history view
        • Remove template content view on remote analysis panel
        • Rename most of optimization items. Sort items in alphabetical order

    [Template Management]

        • Simplify the GUI. Two "Set" buttons have been removed. The XML content is update on the fly with user input.
        • Mandatory fields are marked with a red "*"
        • Add a new field: default selected
        • Add a new Save button, which is enabled for custom templates, and is disabled for built-in (readonly) templates.​
        • Context menu added for each step node
        • Add menu item Remove for group node
        • Disable Remove button for the top level
        • Adjust column width for better text display
        • Prevent user from removing top level group node
        • Update up and down icon
        • Label icon now has the same context menu as label (tree view)
        • Field Step Type has been removed for group node (unnecessary)
        • Title of HKCU operations has been changed according to command name System Optimizer Archives s, for consistency

    [Issue Fix]

    ​Missing icon on optimization result

        1. Add feature "product compatibility". A dialog is added before analysis to ask user for in-use VMware products/features. The information is used to tweak optimization items. For example, if Persona Management is selected, the expected status of Volumn Shadow Copy service is AUTO, rather than the default DISABLED. Currently the configuration covers only Persona Management and View 5.3 Fixpack.
        2. Add template capability: default selection state (XML attribute of step node: defaultSelected). You can specify which item is not selected by default in a template.
        3. By default, item "Disable Windows Firewall Service" is not selected, and the severity level has been lowered from MANDATORY to RECOMMENDED. Disabling Windows Firewall prevents some System Optimizer Archives s from installing correctly.
        4. Fix optimization items
        5. Customer Experience Improvement Plan (CEIPenable)
          * Disable Diagnostic Service Host (WdiServiceHost)
          * Interactive Services Detection (UI0Detect)
          * Disable Windows Media Center Network Sharing Service (WMPNetwrokSVC)
          * Fix blank items
        6. Add MasterTemplate back. This will fix the error message when using Remote Analysis.
        7. Minor model dialog tweak for progress bar dialog.
        8. Update manifest for OS compatibility.
        9. Include build version. So you can identify whether the tool you have has the correct level.

    New for version 2014!

        • Updated templates for Windows 7/8 - based on VMware's OS Optimization Guide
        • New templates for Windows 2008/2012 RDSH servers for use System Optimizer Archives s a desktop
        • Single portal EXE design for ease of deployment and distribution
        • Combination of Remote and Local tools into one tool
        • Better template management, System Optimizer Archives s, with built in and user-definable templates
        • Results report export feature.

    Various bug fixes, usability enhancements, and GUI layout updates.

Источник: [https://torrent-igruha.org/3551-portal.html]

Sysinternals File and Disk Utilities

  • 2 minutes to read

AccessChk
This tool shows you the accesses the user or group you specify has to files, Registry keys or Windows services.

AccessEnum
This simple yet powerful security tool shows you who has what access to directories, files and Registry keys on your systems. Use it to find holes in your permissions.

CacheSet
CacheSet is a program that allows you to control the Cache Manager's working set size using functions provided by NT. It's compatible with all versions of NT.

Contig
Wish you could quickly defragment your frequently used files? Use Contig to optimize individual files, or to create new files that are contiguous.

Disk2vhd
Disk2vhd simplifies the migration of physical systems into virtual machines (p2v).

DiskExt
Display volume disk-mappings.

DiskMon
This utility captures all hard disk System Optimizer Archives s or acts like a software disk activity light in your system tray.

DiskView
Graphical disk sector utility.

Disk Usage (DU)
View disk usage by directory.

EFSDump
View information for encrypted files.

FindLinks
FindLinks reports the file index and any hard links (alternate file paths on the same volume) that exist for the specified file.  A file's data remains allocated so long as at it has at least one file name referencing it.

Junction
Create Win2K NTFS symbolic links.

LDMDump
Dump the contents of the Logical Disk Manager"s on-disk database, which describes the partitioning of Windows 2000 Dynamic disks.

MoveFile
Schedule file rename and delete commands for the next reboot. This can be useful for cleaning stubborn or in-use malware files.

NTFSInfo
Use NTFSInfo to see detailed information about NTFS volumes, including the size and location of the Master File Table (MFT) and MFT-zone, as well as the sizes of the NTFS meta-data files.

PendMoves
See what files are scheduled for delete or rename the next time the system boots.

Process Monitor
Monitor file system, Registry, process, thread and DLL activity in real-time.

PsFile
See what files are opened remotely.

PsTools
The PsTools suite includes command-line utilities for listing the processes running on local or remote computers, running processes remotely, rebooting computers, dumping event logs, and more.

SDelete
Securely overwrite your sensitive files and cleanse System Optimizer Archives s free space of previously deleted files using this DoD-compliant secure delete program.

ShareEnum
Scan file shares on your network and view their security settings to close security holes.

Sigcheck
Dump file version information and verify that images on your system are digitally signed.

Streams
Reveal NTFS alternate streams.

Sync
Flush cached data to disk.

VolumeID
Set Volume ID of FAT or NTFS drives.

Источник: [https://torrent-igruha.org/3551-portal.html]

What's new:

Awarding Winning Work Uses Stochastic Optimization Capabilities of LINGO Software
At the IX National Congress of the Mexican Society for Operations Research, System Optimizer Archives s, 13 - System Optimizer Archives s Oct 2021, José Emmanuel Gómez Rocha, a student at Universidad Autonoma del Estado de Hidalgo, Mexico received the first-place award for the best System Optimizer Archives s in the Undergraduate category, with his thesis "Optimization Models Multi-State Stochastics Applied to the Planning of the Production of a Furniture Company.” The work was directed by Prof. Héctor Rivera Gómez and Prof. Eva Selene Hernández Gress.
In his thesis, Gómez Rocha helped a furniture manufacturing company located in the state of Hidalgo, Mexico deal with the problem of how to set mean capacity as well as production levels in the face of uncertain demand when planning production over multiple periods. He used the stochastic System Optimizer Archives s capabilities of the LINGO System Optimizer Archives s software provided by LINDO Systems. In his work he did extensive analysis of what were the key features that affected expected profit. He looked at things such as is there a big difference between approximating random demand by a three-point distribution vs. a Normal distribution, or using a simple deterministic model as opposed to a model that takes into account uncertainty.

Useful Tips on Building Optimization Based Multi-Period Planning Models
Watch the 30-minute video here


LINDO® products and pandemic models.

LINDO has recently added several models in its MODELS library devoted to modeling pandemics. Learn more.

LINDO adds a Beta version of LINDO® API for Android based hand held devices.
This version offers LINDO API to Android developers who want to incorporate LINDO’s powerful optimizers to their Android applications.
We also include a simple Android application for entering and solving linear, nonlinear and integer optimization models.

YouTube Introduction to LINGO and What'sBest! in Portuguese (Brazilian) Now Available. A collection of over 140 lectures, each of about 5 to 20 minutes in length has recently been made available on YouTube. These videos, in Portuguese, provide a very thorough introduction to the LINGO modeling system and What's Best! add-in to Excel. They start with the very elementary, such as transportation and staff scheduling problems, surplus/slack variables, System Optimizer Archives s, and proceed to cover the more advanced features of LINGO, including K-best solutions and concepts such as convexity and positive definiteness. The videos have been prepared by Flavio Araujo Lim-Apo a master's student in Production Engineering at DEI/PUC-Rio, who has worked with Prof Dr Silvia Araujo dos Reis and Prof Dr Victor Rafael R Celestino from Universidade de Brasilia (UnB). The Lingo's playlist is available here and the What's Best's playlist is available here.

LINDO Systems has added a new, extensive "How to" modeling document to its library. An extensive collection of problems is presented and then modeled in LINGO. Just a few of the problem types described and modeled are: Agriculture, System Optimizer Archives s, Assembly Line Balancing, Aviation, Blending/Diet, Clinics, Construction, Cutting, Energy, Fertilizer, Finance, Investment, Logistics, Metallurgy, Refinery, Scheduling, System Optimizer Archives s, and Transportion. The exercises are complete in that they show not only how to prepare the model but also how to use the various features of LINGO to generate easy to understand reports based on the solutions to the models. This large document is the work product of the energetic Carlos Moya Mulero, System Optimizer Archives s. He has had many years of experience in Operations Management at Volkswagen and elsewhere.

Speed and ease-of-use have made LINDO Systems a leading supplier of software tools for building and solving optimization models


LINDO®linear, nonlinear, integer, stochastic and global programmingsolvers have been used by thousands of companies worldwide to maximize profit and minimize cost on decisions involving production planning, transportation, finance, portfolio allocation, capital budgeting, blending, scheduling, inventory, System Optimizer Archives s, resource allocation and more.

Check our Application Models Library and see what our products can do for you with examples from a wide variety of applications.

Источник: [https://torrent-igruha.org/3551-portal.html]
all] Enables verbose dumping of the threader solver, System Optimizer Archives s.

Chunk size of omp schedule for loops parallelized by parloops.

Schedule System Optimizer Archives s of omp schedule for loops parallelized by parloops (static, dynamic, guided, auto, runtime).

The minimum number of iterations per thread of an innermost parallelized loop for which the parallelized variant is preferred over the single threaded one. Note that for a parallelized loop nest the minimum number of iterations of the outermost loop per thread is two.

Maximum depth of recursion when querying properties of SSA names in things like fold routines. One level of recursion corresponds to following a use-def chain.

The maximum number of may-defs we analyze when looking for a must-def specifying the dynamic type of an object that invokes a virtual call we may be able to devirtualize speculatively.

The maximum number of assertions to add along the default edge of a switch statement during VRP.

Maximum number of basic blocks before EVRP uses a sparse cache.

Specifies the mode Early VRP should operate in.

Specifies the mode VRP pass 1 should operate in.

Specifies the mode VRP pass 2 should operate in.

Specifies the type of debug output to be issued for ranges.

Specifies the maximum number of switch cases before EVRP ignores a switch.

Источник: [https://torrent-igruha.org/3551-portal.html]

Advanced System Optimizer

Advanced System Optimizer (formerly Advanced Vista Optimizer) is a software utility for Microsoft Windows developed by Systweak (a company founded in 1999 by Mr. Shrishail Rana[who?]). It is used System Optimizer Archives s improve computer performance and speed.[1]

Advanced System Optimizer has been reviewed by PCworld,[2]Cnet,[3]G2,[4] and Yahoo.[5]

Features[edit]

Advanced System Optimizer has utilities for optimization, speedup, cleanup, memory management, etc.[6] Its utilities include system cleaners, system and memory optimizers, junk file cleaners, privacy protectors, startup managers, security tools and other maintenance tools.,[7] repair missing or broken DLLs and includes a file eraser, System Optimizer Archives s. There's a "what's recommended" link, which is used to find the problems on the PC, to give info on how to speed up the computer, or to show settings of various program features with the scheduler.[8]

The "Single Click Care" option scans the computer for optimization all areas of the computer. This program features an "Optimization" tab, which is used for memory optimization and to free up memory of the computer. The startup manager feature of this program is used to manage programs that load at the computer's startup.[8]

The registry cleaner has 12 categories of registry errors and can detect and delete registry errors.[9]

The 2008 version had over 25 tools. It can be scheduled to run optimization without the need for user intervention.[10]

Reception[edit]

In a review syndicated to The Washington Post,[11]PC World praised the quality of the suite's design, stating the tools perform as advertised. The reviewer did however note the product's price as one drawback.[7]PC Advisor also praised the package's functionality, but warned readers they would have to decide for themselves whether it is worth the price considering the availability of free alternatives.[12]

Alternatives[edit]

At present users now have several choices to buy better tools for their computer and carry out optimization, privacy protection on their computer. Some of the alternatives are: SafeSoft PC Cleaner CCleaner[original research?]

References[edit]

External links[edit]

Источник: [https://torrent-igruha.org/3551-portal.html]

These options control various sorts of optimizations.

Without any optimization option, the compiler’s goal is to reduce the cost of compilation and to make debugging produce the expected results, System Optimizer Archives s. Statements are independent: if you stop the program with a breakpoint between statements, you can then assign a new value to any variable or change the program counter to any other statement in the function and get exactly the results you expect from the source code.

Turning on optimization flags makes the compiler attempt to improve the performance and/or code size at the expense of compilation time and possibly the ability to debug the program.

The compiler performs optimization based on the knowledge it has of the program. Compiling multiple files at once to a single output file mode allows the compiler to use information gained from all of the files when compiling each of them.

Not all optimizations are controlled System Optimizer Archives s by a flag. Only optimizations that have a flag are listed in this section, System Optimizer Archives s.

Most optimizations are completely disabled at or if an level is not set on the command line, even if individual optimization flags are specified. Similarly, suppresses many optimization passes.

Depending on the target and how GCC was configured, System Optimizer Archives s, a slightly different set of optimizations may be enabled at each level than those listed here. You can invoke GCC with to find out the exact set of optimizations that are enabled at each level. See Overall Options, for examples.

If you use multiple options, with or without level numbers, System Optimizer Archives s, the last such option is the one that is effective.

Options of the form specify machine-independent flags. Most flags have both positive and negative forms; the negative form of is. In the table below, only one of the forms is listed—the one you typically use. You can figure out the other form by either removing ‘’ or adding it.

The following options control specific optimizations. They are either activated by options or are related to ones that are. You can use the System Optimizer Archives s flags in the rare cases when “fine-tuning” of optimizations to be performed is desired.

For machines that must pop arguments after a function call, always pop the arguments as soon as each function returns. At levels and higher, is the default; this allows the compiler to let arguments accumulate on the stack for several function calls and pop them all at once, System Optimizer Archives s.

Perform a forward propagation pass on RTL. The pass tries to combine two instructions and checks if the result can be simplified. If loop unrolling is active, two passes are performed and the second is scheduled after loop unrolling.

This option is enabled System Optimizer Archives s default at optimization levels, System Optimizer Archives s.

disables floating-point expression contraction. enables floating-point expression contraction such as forming of fused multiply-add operations if the target has native support for them, System Optimizer Archives s. enables floating-point expression contraction if allowed by the language standard. This is currently not implemented and treated equal to.

The default is.

Omit the frame pointer in functions that don’t need one. This avoids the instructions to save, set up and restore the frame pointer; on many targets it also makes an extra register available.

On some targets this flag has no effect because the standard calling sequence always uses a frame pointer, so it cannot be omitted.

Note that doesn’t guarantee the frame pointer is used in all functions. Several targets always omit the frame pointer in leaf functions.

Enabled by default at and higher.

Optimize sibling and tail recursive calls.

Enabled at levels.

Optimize various standard C string functions (e.g. or ) and their counterparts into faster alternatives.

Enabled at levels.

Do not expand any functions inline apart from those marked with the attribute. This is the default when not optimizing.

Single functions can be exempted from inlining by marking them with the attribute.

Integrate functions into their callers when their body is smaller than expected function call code (so overall size of program gets smaller). The compiler heuristically decides which functions are simple enough to be worth integrating in this way. This inlining applies to all functions, even those not declared inline.

Enabled at levels.

Inline also indirect calls that are discovered to be known at compile time thanks to previous inlining. This option has any effect only when inlining itself is turned on by the or options.

Enabled at levels.

Consider all functions for inlining, even if they are not declared inline. The compiler heuristically decides which functions are worth integrating in this way.

If all calls to a given function are integrated, and the function is declaredthen the function is normally not output as assembler code in its own right.

Enabled at levels. Also enabled by and.

Consider all functions called once for inlining into their caller even if they are not marked. If a call to a given function is integrated, then the function is not output as assembler code in its own right.

Enabled at levels, andbut not.

Inline functions marked by and functions whose body seems smaller than the function call overhead early before doing instrumentation and real inlining pass. Doing so makes profiling significantly cheaper and usually inlining faster on programs having large chains of nested wrapper functions.

Enabled by default.

Perform interprocedural scalar replacement of aggregates, removal of unused parameters and replacement of parameters System Optimizer Archives s by reference by parameters passed by value, System Optimizer Archives s.

Enabled at levels and.

By default, GCC limits the size of functions that can be inlined. This flag allows coarse control of this limit, System Optimizer Archives s. is the size of functions that can be inlined in number of pseudo instructions.

Inlining is actually controlled by a number of parameters, which may be specified individually by using. The option sets some of these parameters as follows:

is set to /2.

is set to /2.

See below for a documentation of the individual parameters controlling inlining and for the defaults of these parameters.

Note: there may be no value to that results in default behavior.

Note: pseudo instruction represents, in this particular context, an abstract measurement of function’s size. In no way does it represent a count of assembly instructions and as such its exact meaning might change from one release to an another.

This is a more fine-grained version ofwhich applies only to functions that are declared using the attribute or declspec. See Declaring Attributes of Functions.

In C, emit functions that are declared into the object file, even if the function has been inlined into all of its callers. This switch does not affect functions using the extension in GNU C90. In C++, emit any and all inline functions into the object file.

Emit functions into the object file, even if the function is never used.

Emit variables declared when optimization isn’t turned on, even if the variables aren’t referenced.

GCC System Optimizer Archives s this option by default. If you want to force the compiler to check if a variable is referenced, regardless of whether or not optimization is turned on, use the option.

Attempt to merge identical constants (string constants and floating-point constants) across compilation units.

This option is the default for optimized compilation if the assembler and linker support it. Use to inhibit this behavior.

Enabled at levels,.

Attempt to merge identical constants and identical variables.

This option implies. In addition to this considers e.g. even constant initialized arrays or initialized constant variables with integral or floating-point types. Languages like C or C++ require each variable, including multiple instances of the same variable in recursive calls, to have distinct locations, so using this option results in non-conforming behavior.

Perform swing modulo scheduling immediately before the first scheduling pass. This pass looks at innermost loops and reorders their instructions by overlapping different iterations.

Perform more aggressive SMS-based modulo scheduling with register moves allowed. By setting this flag certain anti-dependences edges are deleted, which triggers the generation of reg-moves based on the life-range analysis. This option is effective only with enabled.

Disable the optimization pass that scans for opportunities to use “decrement and branch” instructions on a count register instead of instruction sequences that decrement a register, compare it against zero, and then branch based upon the result. This option is only meaningful on architectures that support such instructions, which include x86, System Optimizer Archives s, PowerPC, IA-64 and S/390. Note that the option doesn’t remove the decrement and branch instructions from the generated instruction stream introduced by other optimization passes.

The default is at and higher, except for.

Do not put function addresses in registers; make each instruction that calls a constant function contain the function’s address explicitly.

This option results in less efficient code, but some strange hacks that alter the assembler output may be confused by the optimizations performed when this option is not used.

The default is

If the target supports a BSS section, GCC by default puts variables that are initialized to zero into BSS. This can save space in the resulting code.

This option turns off this behavior because some programs explicitly rely on variables going to the data section—e.g., so that the resulting executable can find the beginning of that section and/or make assumptions based on that.

The default is.

Perform optimizations that check to see if a jump branches to a location where another comparison subsumed by the first is found. If so, the first branch is redirected to either the destination of the second branch or a point immediately following it, depending on whether the condition is known to be true or false.

Enabled at levels,.

When using a type that occupies multiple System Optimizer Archives s, such as on a 32-bit system, split the registers apart and allocate them independently. This normally generates better code for those types, but may make debugging more difficult.

Enabled at levels,System Optimizer Archives s.

Fully split wide types early, instead of very late. This option has no effect unless is turned on.

This is the default on some targets.

In common subexpression elimination (CSE), scan through jump instructions when the target of the jump is not reached by any other path. For example, when CSE encounters an statement with an clause, CSE follows the jump when the condition tested is false.

Enabled at levels.

This is similar tobut causes CSE to follow jumps that conditionally skip over blocks. When CSE encounters System Optimizer Archives s simple statement with no else clause, causes CSE to follow the jump around the body of the.

Enabled at levels.

Re-run common subexpression elimination after loop optimizations are performed.

Enabled at levels.

Perform a global common subexpression elimination pass. This pass also performs global constant and copy propagation.

Note: When compiling a program using computed gotos, a GCC extension, you may get better run-time performance if you disable the global common subexpression elimination pass by adding to the command line.

Enabled at levels.

When is enabled, global common subexpression elimination attempts to move loads that are only killed by stores into themselves. This allows a loop containing a load/store sequence to be changed to a load Halo Infinite scaricare Archives the loop, and a copy/store within the loop.

Enabled by default when is enabled.

When is enabled, a store motion pass is run after global common subexpression elimination. This System Optimizer Archives s attempts to move stores out of loops. When used in conjunction withloops containing a load/store sequence can be changed to a load before the loop and a store after the loop.

Not enabled at any optimization level.

When is enabled, the global common subexpression elimination pass eliminates redundant loads that come after stores to the same memory location (both partial and full redundancies).

Not enabled at any optimization level.

When is enabled, a redundant load elimination pass is performed after reload. The purpose of this pass is to clean up redundant spilling.

Enabled by and.

This option tells the loop optimizer to use language constraints to derive bounds for the number of iterations of a loop. This assumes that loop code does not invoke undefined behavior by for example causing signed integer overflows or out-of-bound array accesses. The bounds for the number of iterations of a loop are used to guide loop unrolling and peeling and loop exit test optimizations. This option is enabled by default.

This option tells the compiler that variables declared in common blocks (e.g. Fortran) may later be overridden with longer trailing arrays. This System Optimizer Archives s certain optimizations that depend on knowing the array bounds.

Perform cross-jumping transformation. This transformation unifies equivalent code and saves code size. The resulting code may Driver Easy Professional 5.7.0.39448 Crack Free Full Latest Version Download may not perform better than without cross-jumping.

Enabled at levels.

Combine increments or decrements of addresses with memory accesses. This pass is always skipped on architectures that do not have instructions to support this. Enabled by default at and higher on architectures that support this.

Perform dead code elimination (DCE) on RTL. Enabled by default at and higher.

Perform dead store elimination (DSE) on RTL. Enabled by default at and higher.

Attempt to transform conditional jumps into branch-less equivalents. This includes use of conditional moves, min, max, set flags and abs instructions, Quick Heal Total Security Version: 13.00 (6.0.0.4) crack keygen some tricks doable by standard arithmetics. The use of conditional execution on chips where it is available is controlled by.

Enabled at levels, but not with.

Use conditional execution (where available) to transform conditional jumps into branch-less equivalents. System Optimizer Archives s at levels,System Optimizer Archives s,but not with.

The C++ ABI requires multiple entry points for constructors and destructors: one for a base subobject, one for a complete object, and one for a virtual destructor that calls operator delete afterwards. For a hierarchy with virtual bases, the base and complete variants are clones, System Optimizer Archives s, which means two copies of the function. With this option, the base and complete variants are changed to be thunks that call a common implementation.

Enabled by.

Assume that programs cannot safely dereference null pointers, and that no code or data element resides at address zero. This option enables simple constant folding optimizations at all optimization levels. In addition, other optimization passes in GCC use this flag to control global dataflow analyses that eliminate useless checks for Audacity mac Archives pointers; these assume that a memory access to address zero always results in a trap, so that if a pointer is checked after it has already been dereferenced, it cannot be null.

Note however that in some environments this assumption is not true. Use to disable this optimization for programs that depend on that behavior.

This option is enabled by default on most targets. On Nios II ELF, it defaults to off. On AVR, CR16, and MSP430, this option is completely disabled.

Passes that use the dataflow information are enabled independently at different optimization levels.

Attempt to convert Reason 4 crack serial keygen to virtual functions to direct calls. This is done both within a procedure and interprocedurally as part of indirect inlining () and interprocedural constant propagation (). Enabled at levels.

Attempt to convert calls to virtual functions to speculative direct calls. Based on the analysis of the type inheritance graph, determine for a given call the set of likely targets. If the set is small, preferably of size 1, change the call into a conditional deciding between direct and indirect calls. The speculative calls enable more optimizations, System Optimizer Archives s, such as inlining. When they seem useless after further optimization, they are converted back into original form.

Stream extra information needed for aggressive devirtualization when running the link-time optimizer in local transformation mode. This option enables more devirtualization but significantly increases the size of streamed data. For this reason it is disabled by default.

Perform a number of minor optimizations that are relatively expensive.

Enabled at levels.

Attempt to remove redundant extension instructions. This is especially helpful for the x86-64 architecture, System Optimizer Archives s, which implicitly zero-extends in 64-bit registers after writing to their lower 32-bit half.

Enabled for Alpha, AArch64 and x86 at levels.

In C++ the value of an object is only affected by changes within its lifetime: when the constructor begins, the object has an indeterminate value, and any changes during the lifetime of the object are dead when the object is destroyed. Normally dead store elimination will take advantage of this; if your code relies on the value of the object storage persisting beyond the lifetime of the object, you can use this flag to disable this optimization. To preserve stores before the constructor starts (e.g. because your operator new clears the object storage) but still treat the object as dead after the destructor, you can use. The default behavior can be explicitly selected with. is equivalent to.

Attempt to decrease register pressure through register live range shrinkage, System Optimizer Archives s. This is helpful for fast processors with small or moderate size register sets.

Use the specified coloring algorithm for the integrated register allocator. The argument can be ‘’, which specifies Chow’s priority coloring, or ‘’, which specifies Chaitin-Briggs coloring. Chaitin-Briggs coloring is not implemented for all architectures, but for those targets that do support it, it is the default because it generates better code.

Use specified regions for the integrated register allocator. The argument should be one of the following:

‘’

Use all loops as register allocation regions. This can give the best results for machines with a small and/or irregular register set.

‘’

Use all loops except for loops with small register pressure as the regions. This value usually gives the best results in most cases and for most architectures, and is enabled by default when compiling with optimization for speed (,…).

‘’

Use all functions as a single region, System Optimizer Archives s. This typically results in the smallest code size, and is enabled by default for or.

Use IRA to evaluate register pressure in the code hoisting pass for decisions to hoist expressions. This option usually results in smaller code, but it can slow the compiler down.

This option is enabled at level for all targets.

Use IRA to evaluate register pressure in loops for decisions to move loop invariants. This option usually results in generation of faster and smaller code on machines with large register files (>= System Optimizer Archives s registers), but it can slow the compiler down.

This option is enabled at level for some targets.

Disable sharing of stack slots used for saving call-used hard registers living through a call. Each hard register gets a separate stack slot, and as a result function stack frames are larger.

Disable sharing of stack slots allocated for pseudo-registers. Each pseudo-register that does not get a hard register gets a separate stack slot, and as a result function stack frames are larger, System Optimizer Archives s.

Enable CFG-sensitive rematerialization in LRA. Instead of loading System Optimizer Archives s of spilled pseudos, System Optimizer Archives s, LRA tries to rematerialize (recalculate) values if it is profitable.

Enabled at levels.

If supported for the target machine, attempt to reorder instructions to exploit instruction slots available after delayed branch instructions.

Enabled at levels, System Optimizer Archives s, but not at.

If supported for the target machine, attempt to reorder instructions to eliminate execution stalls due to required data being unavailable. This helps machines that have slow floating point or memory load instructions by allowing other instructions to be issued until the result of the load or floating-point instruction is required.

Enabled at levels.

Similar tobut requests an additional pass of instruction scheduling after register allocation has been done. This is especially useful on machines with a relatively small number of registers and where memory load instructions take more than one cycle.

Enabled at levels.

Disable instruction scheduling across basic blocks, which is normally enabled when scheduling before register allocation, i.e. with or at or higher.

Disable speculative motion of non-load instructions, which is normally enabled when scheduling before register allocation, i.e. with or at or higher.

Enable register pressure sensitive insn scheduling before register allocation. This only makes sense when scheduling before register allocation is enabled, i.e. with or at or higher. Usage of this option can improve the generated code and decrease its size by preventing register pressure increase above the number of available hard registers and subsequent spills in register allocation.

Allow speculative motion of some load instructions. This only makes sense when scheduling before register allocation, i.e. with or at PDF Expert 2.5.1 license number Archives or higher.

Allow speculative motion of more load instructions. This only makes sense when scheduling before register allocation, i.e. with or at or higher.

Define how many insns (if any) can be moved prematurely from the queue of stalled insns into the ready list during the second scheduling pass. means that no insns are moved prematurely, means there is no limit on how many queued insns can be moved prematurely. without a value is equivalent to.

Define how many insn System Optimizer Archives s (cycles) are examined for a dependency on a stalled insn that is a candidate for premature removal from the queue of stalled insns. This has an effect only during the second scheduling pass, and only if is used. is equivalent to. without a value is equivalent to.

When scheduling after register allocation, use superblock scheduling. This allows motion across basic block boundaries, System Optimizer Archives s, resulting in faster schedules. This option is experimental, as not all machine descriptions used by GCC model the CPU closely enough to avoid unreliable results from the algorithm.

This only makes sense when scheduling after register allocation, i.e, System Optimizer Archives s. with or at or higher.

Enable the group heuristic in the scheduler. This heuristic favors the instruction that belongs to a schedule group. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the critical-path heuristic in the scheduler. This heuristic favors instructions on the critical path. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the speculative instruction heuristic in the scheduler. This heuristic favors speculative instructions with greater dependency weakness. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the rank heuristic in the scheduler. This heuristic favors the instruction belonging to a basic block with greater size or frequency. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the last-instruction heuristic in the scheduler. This heuristic favors the instruction that is less dependent on the last instruction scheduled. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the dependent-count heuristic in the scheduler. This heuristic favors the instruction that has more instructions depending on it. This is enabled by default when scheduling is enabled, i.e. System Optimizer Archives s or or at or higher.

Modulo scheduling is performed before traditional scheduling. If a loop is modulo scheduled, System Optimizer Archives s, later scheduling passes may change its schedule, System Optimizer Archives s. Use this option to control that behavior.

Schedule instructions using selective scheduling algorithm. Selective scheduling runs instead of the first scheduler pass.

Schedule System Optimizer Archives s using selective scheduling algorithm. Selective scheduling runs instead of the second scheduler pass.

Enable software pipelining of innermost loops during selective scheduling. This option has no effect unless one of or is turned on.

When pipelining loops during selective scheduling, also pipeline outer loops. This option has no effect unless is turned on, System Optimizer Archives s.

Some object formats, like ELF, allow interposing of symbols by the dynamic linker. This means that for symbols exported from the DSO, the compiler cannot perform interprocedural propagation, inlining and other optimizations in anticipation that the function or variable in question may change. While this feature is useful, for example, to rewrite memory allocation functions by a debugging implementation, System Optimizer Archives s, it is expensive in the terms of code quality. With the compiler assumes that if interposition happens for functions the overwriting function will have precisely the same semantics (and side effects). Similarly if interposition happens for variables, the constructor of the variable will be the same. The flag has no effect for functions explicitly declared inline (where it is never allowed for interposition to change semantics) and for symbols explicitly declared weak.

Emit function prologues only before parts of the function that need it, rather than at the top of the function. This flag is enabled by default at and higher, System Optimizer Archives s.

Shrink-wrap separate parts of the prologue and epilogue separately, so that those parts are only executed when needed. This option is on by default, but has no effect unless is also turned on and the target supports this.

Enable allocation of values to registers that are clobbered by function calls, by emitting extra instructions to save and restore the registers around such calls, System Optimizer Archives s. Such allocation is done only when it seems to result in better code.

This option is always enabled by default on certain machines, System Optimizer Archives s, usually those which have no call-preserved registers to use instead.

Enabled at levels.

Tracks stack adjustments (pushes and pops) and stack memory references and then tries to find ways to combine them.

Enabled by default at and higher.

Use caller save registers System Optimizer Archives s allocation if those registers are not used by any called function. In that case it is not necessary to save and restore them around calls. This is only possible if called functions are part of same compilation unit as current function and they are compiled before it.

Enabled at levels,however the option is disabled if generated code will be instrumented for profiling (, or ) or if callee’s register usage cannot be known exactly (this happens on targets that do not expose prologues and epilogues in RTL).

Attempt to minimize stack usage. The compiler attempts to use less stack space, even if that makes the program slower. This option implies setting the parameter to 100 and the parameter to 400.

Perform reassociation on trees. This flag is enabled by default at and higher.

Perform code hoisting. Code hoisting tries to move the evaluation of expressions executed on all paths to the function exit as early as possible. This is especially useful as a code size optimization, but it often helps for code speed as well. This flag is enabled by default System Optimizer Archives s and higher.

Perform partial redundancy elimination (PRE) on trees. This flag is enabled by default at and.

Make partial redundancy elimination (PRE) more aggressive. This flag is enabled by default at.

Perform forward propagation on trees. This flag is enabled by default at and higher.

Perform full redundancy elimination (FRE) on trees. The difference between FRE and PRE is that FRE only considers expressions that are computed on all paths leading to the redundant computation. This analysis is faster than PRE, though it exposes fewer redundancies. This flag is enabled by default at and higher.

Perform hoisting of loads from conditional pointers on trees. This pass is enabled by default at and higher.

Speculatively hoist loads from both branches of an if-then-else if the loads are from adjacent locations in the same structure and the target architecture has a conditional move instruction. This flag is enabled by default at and higher, System Optimizer Archives s.

Perform copy propagation on trees. This pass eliminates unnecessary copy operations. This flag is enabled by default at and higher.

Discover which functions are pure or constant. Enabled by default at and higher. CorelDRAW 22.2.0.532 Crack Archives which static variables do not escape the compilation unit. Enabled by default at and higher.

Discover System Optimizer Archives s, write-only and non-addressable static variables. Enabled by default at and higher.

Reduce stack alignment on call sites if possible. Enabled by default.

Perform interprocedural pointer analysis and interprocedural modification and reference analysis. This option can cause excessive memory and compile-time usage on large compilation units, System Optimizer Archives s. It is not enabled by default at any optimization level.

Perform interprocedural profile propagation. The functions called only from cold functions are marked as cold. Also functions executed once (such as, static constructors or destructors) are identified. Cold functions and loop less parts of System Optimizer Archives s executed once are then optimized for size. Enabled by default at and higher.

Perform interprocedural mod/ref analysis. This optimization analyzes the side effects of functions (memory locations that are modified or referenced) and enables better optimization across the function call boundary. This flag is enabled by default at and higher, System Optimizer Archives s.

Perform interprocedural constant propagation. This optimization analyzes the program to determine when System Optimizer Archives s passed to functions are constants and then optimizes accordingly. This optimization can substantially increase performance if the application has constants passed to functions. This flag is enabled by default at and. It is also enabled by and.

Perform function cloning to make interprocedural constant propagation stronger. When enabled, interprocedural constant propagation performs function cloning when externally visible function can be called with constant arguments. Because this optimization can create multiple copies of functions, it may significantly increase code size (see ). This flag is enabled by default at. It is also enabled by and.

When enabled, perform interprocedural bitwise constant propagation. This flag is enabled by default at and by and. It requires that is enabled.

When enabled, perform interprocedural propagation of value ranges. This flag is enabled by default at. It requires that is enabled.

Perform Identical Code Folding for functions and read-only variables. The optimization reduces code size and may disturb unwind stacks by replacing a function by equivalent one with a different name. The optimization works more effectively with link-time optimization enabled.

Although the behavior is similar to the Gold Linker’s ICF optimization, GCC ICF works on different levels and thus the optimizations are not same - there are equivalences that are found only by GCC and equivalences found only by Gold.

This flag is enabled by default at and.

Control GCC’s optimizations to produce output suitable for live-patching.

If the compiler’s optimization uses a function’s body or information extracted from its body to optimize/change another function, the latter is called an impacted function of the former. If a function is patched, its impacted functions should be patched too.

The impacted functions are determined by the compiler’s interprocedural optimizations. For example, a caller is impacted when inlining a function into its caller, cloning a function and changing its caller to Little Nightmares (PC) PT-BR | Download Torrent this new clone, or extracting a function’s pureness/constness information to optimize its direct or indirect callers, etc.

Usually, the more IPA optimizations enabled, the larger the number of impacted functions for each function. In order to control the number of impacted functions and more easily compute the list of impacted function, System Optimizer Archives s, IPA optimizations can be partially enabled at two different levels.

The argument should be one of the following:

‘’

Only enable inlining and cloning optimizations, which includes inlining, cloning, interprocedural scalar replacement of aggregates and partial inlining, System Optimizer Archives s. As a result, System Optimizer Archives s, when patching a function, all its callers and its clones’ callers are impacted, therefore need to be patched as well.

disables the following optimization flags:

-fwhole-program -fipa-pta -fipa-reference -fipa-ra -fipa-icf -fipa-icf-functions -fipa-icf-variables -fipa-bit-cp -fipa-vrp -fipa-pure-const -fipa-reference-addressable -fipa-stack-alignment -fipa-modref
‘’

Only enable inlining of static functions. As a result, when patching a static function, System Optimizer Archives s, all its callers are impacted and so need to be patched as well.

In addition to all the flags that disables, disables the following additional optimization flags:

-fipa-cp-clone -fipa-sra -fpartial-inlining -fipa-cp

When is specified without any value, the default value is.

This flag is disabled by default.

Note that is not supported with link-time optimization ().

Detect paths that trigger erroneous or undefined behavior due to dereferencing a null pointer, System Optimizer Archives s. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behavior into a trap. This flag is enabled by default at and higher and depends on also being enabled.

Detect paths that trigger erroneous or undefined behavior due to a null value being used in a way forbidden by a or attribute. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behavior into a trap. This is not currently enabled, but may be enabled by in the future.

Perform forward store motion on trees. This flag is enabled by default at and higher.

Perform sparse conditional bit constant propagation on trees and propagate pointer alignment information. This pass only operates on local scalar variables and is enabled by default at and higher, except for. It requires that is enabled.

Perform sparse conditional constant propagation (CCP) on trees. This pass only operates on local scalar variables and is enabled by default at and higher.

Propagate information about uses of a value up the definition chain in order to simplify the definitions. System Optimizer Archives s example, this pass strips sign operations System Optimizer Archives s the sign of a value never matters. The flag is enabled by default at and higher.

Perform pattern matching on SSA PHI nodes to optimize conditional code. This pass is enabled by default at and higher, except for.

Perform conversion of simple initializations in a switch to initializations from a System Optimizer Archives s array. This flag is enabled by default at and higher.

Look for identical code sequences. When found, replace one with a jump to the other. This optimization is known as tail merging or cross jumping. This flag is enabled by default at and higher. The compilation time in this pass can be limited using parameter and parameter.

Perform dead code elimination (DCE) on trees, System Optimizer Archives s. This flag is enabled by default at and higher.

Perform conditional dead code elimination (DCE) for calls to built-in functions that may set but are otherwise free of side effects. This flag is enabled by default at and higher if is not also specified.

Assume that a loop with an exit will eventually take the exit and not loop indefinitely. This allows the compiler to remove loops that otherwise have no side-effects, not considering System Optimizer Archives s endless looping as such.

This option is enabled by default at for C++ with -std=c++11 or higher.

Perform a variety of simple scalar cleanups (constant/copy propagation, redundancy elimination, range propagation and expression simplification) based on a dominator tree traversal. This also performs jump threading (to reduce jumps to jumps). This flag is enabled by default at and higher.

Perform dead store elimination (DSE) on trees. A dead store is a store into a memory location that is later overwritten by another store without any intervening loads. In this case the earlier store can be deleted. This flag is enabled by default at and higher.

Perform loop header copying on trees. This is beneficial since it increases effectiveness of code motion optimizations. It also saves one jump. This flag is enabled by default at and higher. It is not enabled forsince it usually increases code size.

Perform loop optimizations on trees. This flag is enabled by default at and higher.

Perform loop nest optimizations. Same as. To use this code transformation, GCC has to be configured with to enable the Graphite loop transformation infrastructure.

Enable the identity transformation for graphite. For every SCoP we generate the polyhedral representation and transform it back to gimple. Using we can check the costs or benefits of the GIMPLE -> GRAPHITE -> GIMPLE transformation. Some minimal optimizations are also performed by the code generator isl, like index splitting and dead code elimination in loops.

Enable the isl based loop nest optimizer. This is a generic loop nest optimizer based on the Pluto optimization algorithms. It calculates a loop structure optimized for data-locality and parallelism. This option is experimental.

Use the Graphite data dependence analysis to identify loops that can be parallelized. Parallelize all the loops that can be analyzed to not contain loop carried dependences without checking that it is profitable to parallelize the loops.

While transforming the program out of the SSA representation, attempt to reduce copying by coalescing versions of different user-defined variables, instead of just compiler temporaries. This may severely limit the ability to debug an optimized program compiled with. In the negated form, this flag prevents SSA coalescing of user variables. This option is enabled by default if optimization is enabled, and it does very little otherwise.

Attempt to transform conditional jumps in the innermost loops to branch-less equivalents. The intent is to remove control-flow from the innermost loops in order to improve the ability of the vectorization pass to handle these loops. This is enabled by default if vectorization is enabled.

Perform loop distribution. This flag can improve cache performance on big loop bodies and allow further loop optimizations, like parallelization or vectorization, to take place. For example, the loop

DO I = 1, N A(I) = B(I) + C D(I) = E(I) * F ENDDO

is transformed to

DO I = 1, N A(I) = B(I) + C ENDDO DO I = 1, N D(I) = E(I) * F ENDDO

This flag is enabled by default at. It is also enabled by and.

Perform loop distribution of patterns that can be code generated with calls to a library. This flag is enabled by default at and higher, and by and.

This pass distributes the initialization loops and generates a call to memset zero. For example, System Optimizer Archives s, the loop

DO I = 1, N A(I) = 0 B(I) = A(I) + I ENDDO

is transformed to

DO I = 1, N A(I) = 0 ENDDO DO I = 1, System Optimizer Archives s, N B(I) = A(I) + I ENDDO

and the initialization loop is transformed into a call to memset zero. This flag is enabled by default at. It is also enabled by and.

Perform loop interchange outside of graphite. This flag can improve cache performance on loop nest and allow further loop optimizations, System Optimizer Archives s, like vectorization, to take place. For example, the loop

for (int i = 0; i < N; i++) for (int j = 0; j < N; j++) System Optimizer Archives s for (int k = 0; k < N; k++) c[i][j] = c[i][j] + a[i][k]*b[k][j];

is transformed to

for (int i = 0; i < N; i++) for (int k = 0; k < N; k++) for (int j = 0; j < N; j++) c[i][j] = c[i][j] + a[i][k]*b[k][j];

This flag is enabled by default at. It is also enabled by and.

Apply unroll and jam transformations on feasible loops. In a loop nest this unrolls the outer loop by some factor and fuses the resulting multiple inner loops, System Optimizer Archives s. This flag is enabled by default at. It is also enabled by and.

Perform loop invariant motion on trees. This pass moves only invariants that are hard to handle at RTL level (function calls, operations that expand to nontrivial sequences of insns). With it also moves operands of conditions that are invariant out of the loop, so that we can use just trivial invariantness analysis in loop unswitching. The pass also includes store motion.

Create a canonical counter for number of iterations in loops for which determining number of iterations requires complicated analysis. Later optimizations then may determine the number easily. Useful especially in connection with unrolling.

Perform final value replacement. If a variable is modified in a loop in such a way that its value when exiting the loop can be determined using only its initial value and the number of loop iterations, replace uses of the final value by such a computation, provided it is sufficiently cheap. This reduces data dependencies and may allow further simplifications. Enabled by default at and higher.

Perform induction variable optimizations (strength reduction, induction variable merging and induction variable elimination) on trees.

Parallelize loops, i.e., split their iteration space to run in n threads. This is only possible for loops whose iterations are independent and can be arbitrarily reordered. The optimization is only profitable on multiprocessor machines, for loops that are CPU-intensive, rather than constrained e.g. by memory bandwidth. This option impliesand thus is only supported on targets that have support for.

Perform function-local points-to analysis on trees. This flag is enabled by default at and higher, except for.

Perform scalar replacement of aggregates. This pass replaces structure references with scalars to prevent committing structures to memory too early. This flag is enabled by default at and higher, except for.

Perform merging of narrow stores to consecutive memory addresses. This pass merges contiguous stores of immediate values narrower than a word into fewer wider stores to reduce the number of instructions, System Optimizer Archives s. This is enabled by default at and higher as well asSystem Optimizer Archives s.

Perform temporary expression replacement during the SSA->normal phase. Single use/single def temporaries are replaced at their use location with their defining expression. This results in non-GIMPLE code, but gives the expanders much more complex trees to work on resulting in better RTL generation. This is enabled by default at and higher.

Perform straight-line strength reduction on trees. This recognizes related expressions involving multiplications and replaces them by less expensive calculations when possible. This is enabled by default at and higher.

Perform vectorization on System Optimizer Archives s. This flag enables and if not explicitly specified.

Perform loop vectorization on trees. This flag is enabled by default at and by, and.

Perform basic block vectorization on trees. This flag is enabled by default at and by, and.

Initialize automatic variables with either a pattern or with zeroes to increase the security and predictability of a program by preventing uninitialized memory disclosure and use. GCC still considers an automatic variable that doesn’t have an explicit initializer as uninitialized, -Wuninitialized will still report warning messages on such automatic variables. With this option, GCC will also initialize any padding of automatic variables that have structure or union types to zeroes.

The three values of are:

  • ‘’ doesn’t initialize any automatic variables. This is C and C++’s default.
  • ‘’ Initialize automatic variables with values which will likely transform logic bugs into crashes down the line, are easily recognized in a crash dump and without being values that programmers can rely on for useful program semantics. The current value is byte-repeatable pattern with byte "0xFE". The values used for pattern initialization might be changed in the future.
  • ‘’ Initialize automatic variables with zeroes.

The default is ‘&rsquo.

You can control this behavior for a specific variable by using the variable attribute (see Variable Attributes).

Alter the cost model used for vectorization. The argument should be one of ‘’, ‘’, ‘’ or ‘’, System Optimizer Archives s. With the ‘’ model the vectorized code-path is assumed to be profitable while with the ‘’ model a runtime check guards the vectorized code-path to enable it only for iteration counts that will likely execute faster than when executing the original scalar loop. The ‘’ model disables vectorization of loops where doing so would be cost prohibitive for example due to required runtime checks for data dependence or alignment but otherwise is equal to the ‘’ model. The ‘’ model only allows vectorization if the vector code would entirely replace the scalar code that is being vectorized. For example, if each iteration of a vectorized loop would only be able to handle exactly four iterations of the scalar loop, the ‘’ model would only allow vectorization if the scalar System Optimizer Archives s count is known to be a multiple of four.

The default cost model depends on other optimization flags and is either ‘’ or ‘&rsquo.

Alter the cost model used for vectorization of loops marked with the OpenMP simd directive. The argument should be one of ‘’, ‘’, ‘&rsquo. All values of have the same meaning as Alien skin 2 keygen,serial,crack,generator,unlock,key in and by default a cost model defined with is used.

Perform Value Range Propagation on trees. System Optimizer Archives s This is similar to the constant propagation pass, but instead of values, ranges of values are propagated. This allows the optimizers to remove unnecessary range checks like array bound checks and null pointer checks. This is enabled by default at and higher. Null pointer check elimination is only done if is enabled.

Split paths leading to loop backedges. This can improve dead code elimination and common subexpression elimination. This is enabled by default at and above.

Enables expression of values of induction variables in later iterations of the unrolled loop using the value in the first iteration, System Optimizer Archives s. This breaks long dependency chains, thus improving efficiency of the scheduling passes.

A combination of and CSE is often sufficient to obtain the same effect. However, that is not reliable in cases where the loop body is more complicated than a single basic block. It also does not work at all on some architectures due to restrictions in the CSE pass.

This optimization is enabled by default.

With this option, the compiler creates multiple copies of some local variables when unrolling a loop, which can result in superior code.

This optimization is enabled by default for PowerPC targets, but disabled by default otherwise.

Inline parts of functions, System Optimizer Archives s. This option has any effect only when inlining itself is turned on by the or Steganos Privacy Suite 21.1.1 Full Version.

Enabled at levels, System Optimizer Archives s.

Perform predictive commoning optimization, System Optimizer Archives s, i.e., reusing computations (especially memory loads and stores) performed in previous iterations of loops.

This option is enabled at level. It is also enabled by and.

If supported by the target machine, generate instructions to prefetch memory to improve the performance of loops that access large arrays.

This option may generate better or worse code; results are highly dependent on the structure of loops within the source code.

Disabled at level.

Do not substitute constants for known return value of formatted output functions such as,and (but not of ). This transformation allows GCC to optimize or even eliminate branches based on the known return value of these functions called with arguments that are either constant, or whose values are known to be in a range that makes determining the exact return value possible, System Optimizer Archives s. For example, when is in effect, both the branch and the body of the statement (but not the call to ) can be optimized away when is a 32-bit or smaller integer because the return value is guaranteed to be at most 8.

char buf[9]; if (snprintf (buf, "%08x", i) >= sizeof buf) …

The option relies on other optimizations and yields best results with and above. It works in tandem with the and options. The option is enabled System Optimizer Archives s default.

Disable any machine-specific peephole optimizations. The difference between and is in how they are implemented in the compiler; some targets use one, some use the other, a few use both, System Optimizer Archives s.

is enabled by default. enabled at levels.

Do not guess branch probabilities using heuristics, System Optimizer Archives s.

GCC uses heuristics to guess branch probabilities if they are not provided by profiling feedback (). These heuristics are based on the control flow graph. If some branch probabilities are specified bythen the heuristics are used to guess branch probabilities for the rest of the control flow graph, taking the info into account. The interactions between the heuristics and can be complex, and in some cases, System Optimizer Archives s, it may be useful to disable the heuristics so that the effects of are easier to understand.

It is also possible to specify expected probability of the expression with built-in function.

The default is at levels,.

Reorder basic blocks in the compiled function in order to reduce number of taken branches and improve code locality.

Enabled at levels,.

Use the specified algorithm for basic block reordering. The argument can be ‘’, which does not increase code size (except sometimes due to secondary effects like alignment), or ‘’, the “software trace cache” algorithm, which tries to put all often executed code together, minimizing the number of branches executed by making extra copies of code.

The default is ‘’ at levels, and ‘’ at levels.

In addition to reordering basic blocks in the compiled function, in order to reduce number of taken branches, partitions hot and cold basic blocks into separate sections of the assembly and files, to improve paging and cache locality performance.

This optimization is automatically turned off in the presence of exception handling or unwind tables (on targets using setjump/longjump or target specific scheme), for linkonce sections, for functions with a user-defined section attribute and on any architecture that does not support named sections. When is used this option is not enabled by default (to avoid linker errors), but may be enabled explicitly (if using a working linker).

Enabled for x86 at levels.

Reorder functions in the object file in order to improve code locality. This is implemented by using special subsections for most frequently executed functions and for unlikely executed functions. Reordering is done by the linker so object file format must support named sections and linker must place them in a reasonable way.

This option isn’t effective unless you either provide profile feedback (see for details) or manually annotate functions with Audials One Platinum 2020 Crack 2020.0.73.7300 With Full Version or attributes (see Common Function Attributes).

Enabled at levels.

Allow the compiler to assume the strictest aliasing rules applicable to the language being compiled. For C (and C++), this activates optimizations based on the type of expressions. In particular, an object of one type is assumed never to reside at the same address as an object of a different type, unless the types are almost the same. For example, an can alias anbut not a or a. A character type may alias any other type.

Pay special attention to code like this:

union a_union { int i; double d; }; int f() { union a_union t; t.d = 3.0; return t.i; }

The practice of reading from a different union member than the one most recently written to (called “type-punning”) is common. Even withtype-punning is allowed, provided the memory is accessed through the union type. So, the code above works as expected. See Structures unions enumerations and bit-fields implementation. However, this code might not:

int f() { union a_union t; int* ip; t.d = 3.0; ip = &t.i; return *ip; }

Similarly, access by taking the address, casting the resulting pointer and dereferencing the result has undefined behavior, even if the cast uses a union type, e.g.:

int f() { double d = 3.0; return ((union a_union *) &d)->i; }

The option is enabled at levels.

Align the start of functions to the next power-of-two greater than or equal toskipping up to -1 bytes. This ensures that at least the first bytes of the function can be fetched by the CPU without crossing an -byte alignment boundary.

If is not specified, it defaults to.

Examples: aligns functions to the next 32-byte boundary, aligns to the next 32-byte boundary only if this can be done by skipping 23 bytes or less, aligns to the next 32-byte boundary only if this can be done by skipping 6 bytes or less.

The second pair of : values allows you to specify a secondary alignment: aligns to the next 64-byte boundary if this can be done by skipping 6 bytes or less, otherwise aligns to the next 32-byte boundary if this can be done by skipping 2 bytes or less, System Optimizer Archives s. If is not specified, it defaults to.

Some assemblers only support this flag when is a power of two; in that case, it is rounded up.

and are equivalent and mean that functions are not aligned. Microsoft Toolkit 2.6.7 Crack Activator for Office + Windows Free 2021 is not specified or is zero, use a machine-dependent default. The maximum allowed option value is 65536.

Enabled at levels.

If this option is enabled, the compiler tries to avoid unnecessarily overaligning functions. It attempts to instruct the assembler to align by the amount specified bybut not to XenArmor All-In-One Key Finder Pro - Oct 2020 crack serial keygen more bytes than the size of the function.

Align all branch targets to a power-of-two boundary.

Parameters of this option are analogous to the option. and are equivalent and mean that labels are not aligned.

If or are applicable and are greater than this value, then their values are used instead, System Optimizer Archives s.

If is not specified or is zero, use a machine-dependent default which is very likely to be ‘’, meaning no alignment. The maximum allowed option value is 65536.

Enabled at levels.

Align loops to a power-of-two boundary. If the loops are executed many times, this makes up for any execution of the dummy padding instructions.

If is greater than this value, then its value is used instead.

Parameters of this option are analogous to the option. and are equivalent and mean that loops are not aligned. The maximum allowed option value is 65536.

If is not specified or is zero, use a machine-dependent default.

Enabled at levels.

Align branch targets to a power-of-two boundary, for branch targets where the targets can only be reached by jumping. System Optimizer Archives s this case, System Optimizer Archives s, no dummy operations need be executed.

If is greater than this value, then its value is used instead.

Parameters of this option are analogous to the option. and are equivalent and mean that loops are not aligned.

If is not specified or is zero, use a machine-dependent default. The maximum allowed option value is 65536.

Enabled at levelsSystem Optimizer Archives s.

Do not remove unused C++ allocations in System Optimizer Archives s code elimination.

Allow the compiler to perform optimizations that may introduce new data races on stores, without proving that the variable cannot be concurrently accessed by other threads. Does not affect optimization of local data. It is safe to use this option if it is known that global data will not be accessed by multiple threads.

Examples of optimizations enabled by include hoisting or if-conversions that may cause a value that was already in memory to be re-written with that same value. Such re-writing is safe in a single threaded context but System Optimizer Archives s be unsafe in a multi-threaded context. Note that on some processors, if-conversions may be required in order to enable vectorization.

Enabled at level.

This option is left for compatibility reasons. has no effect, while implies and.

Enabled by default.

Do not reorder top-level functions, variables, and statements. Output them in the same order that they appear in the input file. When this option is used, unreferenced axure rp 9 license key free download Archives variables System Optimizer Archives s not removed. This option is intended to support existing code that relies on a particular ordering. For new code, it is better to use attributes when possible.

is the default at and higher, and also at if is explicitly requested. Additionally implies.

Constructs webs as commonly used for register allocation purposes and assign each web individual pseudo register. This allows the register allocation pass to operate on pseudos directly, but also strengthens several other optimization passes, such as CSE, loop optimizer and trivial dead code remover. It can, however, make debugging impossible, since variables no longer stay in a “home register&rdquo.

Enabled by default with.

Assume that the current compilation unit represents the whole program being compiled. All public functions and variables with the exception of and those merged by attribute become static functions and in effect are optimized more aggressively by interprocedural optimizers, System Optimizer Archives s.

This option should not be used in combination with. Instead relying on a linker plugin should provide safer and more precise information.

This option runs the standard link-time optimizer. When invoked with source code, it generates GIMPLE (one of GCC’s internal representations) and writes it to special ELF sections in the object file, System Optimizer Archives s. When the object files are linked together, all the function bodies are read from these ELF sections and instantiated as if they had been part of the same translation unit.

To use the link-time optimizer, and optimization options should be specified at compile time and during the final link. It is recommended that you compile all the files participating in the same link with the same options and also specify those options at link time. For example:

gcc -c -O2 -flto foo.c gcc -c -O2 -flto bar.c gcc -o myprog -flto -O2 foo.o bar.o

The first two invocations to GCC save a bytecode representation of GIMPLE into special ELF sections inside and. The final invocation reads the GIMPLE bytecode from andmerges the two files into a single internal image, and compiles the result as usual. Since both and are merged into a single image, this causes System Optimizer Archives s the interprocedural analyses and optimizations in GCC to work across the two files as if they were a single one. This means, for example, that System Optimizer Archives s inliner is able to inline functions in into functions in and vice-versa.

Another (simpler) way to enable link-time optimization is:

gcc -o myprog -flto -O2 foo.c bar.c

The above generates bytecode for andmerges them together into a single GIMPLE representation and optimizes them as usual to produce.

The important thing to keep in mind is that to enable link-time optimizations you need to use the GCC driver to perform the link step. GCC automatically performs link-time optimization if any of the objects involved were compiled with the command-line option. You can always override the automatic decision to do link-time optimization by passing to the link command.

To make whole program optimization effective, it is necessary to make certain whole program assumptions. The compiler needs to know what functions and variables can be accessed by libraries and runtime outside of the link-time optimized unit. When supported by the linker, the linker plugin (see ) passes information to the compiler about used and externally visible symbols. When the linker plugin is not available, should be used to allow the System Optimizer Archives s to make these assumptions, which leads to more aggressive optimization decisions.

When a file is compiled with withoutthe generated object file is larger than a regular object file because it contains GIMPLE bytecodes and the usual final code (see ). This means that object files with LTO information can be linked as normal object files; System Optimizer Archives s is passed to the linker, no interprocedural optimizations are applied. Note that when is enabled the compile stage is faster but you cannot perform a regular, non-LTO link on them.

When producing the final binary, GCC only applies link-time optimizations to those files that contain bytecode. Therefore, you can mix and match object files and libraries with GIMPLE bytecodes and final object code. GCC automatically selects which files to optimize in LTO mode and which files to link without further processing.

Generally, options specified at link time override those specified at compile time, although in some cases GCC attempts to infer link-time options from the settings used to compile the input files.

If you do not specify an optimization level option at link time, then GCC uses the highest optimization level used when compiling the object files. Note that it is generally ineffective to specify an optimization level option only at link time and not at compile time, for two reasons. First, compiling without optimization suppresses compiler passes that gather information needed for effective optimization at link time. Second, some early optimization passes can be performed only at compile time and not at link time.

There are some code generation flags preserved by GCC System Optimizer Archives s generating bytecodes, as they System Optimizer Archives s to be used during the final link. Currently, the following options and their settings are taken from the first object System Optimizer Archives s that explicitly specifies them: , and all the target flags.

The following options System Optimizer Archives s, and are combined based on the following scheme:

+ = + = + (no option) = (no option) + = + = + =

Certain ABI-changing flags are required to match in all compilation units, and trying to override this at link time with a conflicting value is ignored. This includes options such as and.

Other options such as, or are passed through to the link stage and merged conservatively for conflicting translation units. Specifically and take precedence; and for example takes precedence over. You can override them at link time.

Diagnostic options such as are passed through to the link stage and their setting matches that of the compile-step at function granularity. Note that this matters only for diagnostics emitted during optimization. Note that code transforms such as inlining can lead to warnings being enabled or disabled for regions if code not consistent with the setting at compile time.

When you need to pass options to the assembler via or make sure to either compile such translation units with or consistently use the same assembler options on all translation units. You can alternatively also specify assembler options at LTO link time.

To enable debug info generation you need to supply at compile time. If any of the input files at link time were built with debug info generation enabled the link will enable debug info generation as well. Any elaborate debug info settings like the dwarf level need to be explicitly repeated at the linker command line and mixing different settings in different translation units is discouraged.

If LTO encounters objects with C linkage declared with incompatible types in separate translation units to be linked together (undefined behavior according to ISO C99 6.2.7), a non-fatal diagnostic may be issued. The behavior is still undefined at run time. Similar diagnostics may be raised for other languages.

Another feature of LTO is that it is possible to apply interprocedural optimizations on files written in different languages:

gcc -c -flto foo.c g++ -c -flto bar.cc gfortran -c -flto baz.f90 g++ -o myprog -flto -O3 foo.o bar.o baz.o -lgfortran

Notice that the final link is done with to get the C++ runtime libraries and is added to get the Fortran runtime libraries. In general, System Optimizer Archives s, when mixing languages in LTO mode, you should use the same link command options as when mixing languages in a regular (non-LTO) compilation.

If object files containing GIMPLE bytecode are stored in a library archive, sayit is possible to extract and use them in an LTO link if you are using a linker with plugin support, System Optimizer Archives s. To create static libraries suitable for LTO, System Optimizer Archives s and instead of and ; to show the symbols of object files with GIMPLE bytecode, use. Those commands require that and have been compiled with plugin support. System Optimizer Archives s At link time, use the flag to ensure that the library participates in the System Optimizer Archives s optimization process:

gcc -o myprog -O2 -flto -fuse-linker-plugin a.o b.o -lfoo

With the linker plugin enabled, the linker extracts the needed GIMPLE files from and passes them on to the running GCC to make them part of the aggregated GIMPLE image to be optimized.

If you are not System Optimizer Archives s a linker with plugin support and/or do not enable the linker plugin, then the objects inside are extracted and linked as usual, but they do not participate in the LTO optimization process. In order to make a static library suitable for both LTO optimization and usual linkage, compile its object files with.

Link-time optimizations do not require the presence of the whole program to operate. If the program does not require any symbols to be exported, it is possible to combine and to allow the interprocedural optimizers to use more aggressive assumptions which may lead to improved System Optimizer Archives s opportunities, System Optimizer Archives s. Use of is not needed when linker plugin is active (see ).

The current implementation of LTO makes no attempt to generate bytecode that is portable between different types of hosts. The bytecode files are versioned and there is a strict version check, so bytecode files generated in one version of GCC do not work with an older or newer version of GCC.

Link-time optimization does not work well with generation of debugging information on systems other than those using a combination of ELF and DWARF.

If you specify the optionalthe optimization and code generation done at link time is executed in parallel using parallel jobs by utilizing an installed program. The environment variable may be used to override the program used.

You can also specify to use GNU make’s job server mode to determine the number of parallel jobs. This is useful when the Makefile calling GCC is already executing in parallel. You must prepend a ‘’ to the command recipe in the parent Makefile for this to work. This option likely only works if is GNU make. Even without the option value, GCC tries to automatically detect a running GNU make’s job server.

Use to use GNU make’s job server, if available, or otherwise fall back to autodetection of the number of CPU threads present in your system.

Specify the partitioning algorithm used by the link-time optimizer. The value is either ‘’ to specify a partitioning mirroring the original source files or ‘’ to specify partitioning into equally sized chunks (whenever possible) or ‘’ to create new partition for every symbol where possible. Specifying ‘’ as an algorithm disables System Optimizer Archives s and streaming completely. The default value is ‘&rsquo. While ‘’ can be used as an workaround for various code ordering issues, the ‘’ partitioning is intended for internal testing only. The value ‘’ specifies that exactly one partition should be used while the value ‘’ bypasses partitioning and executes the link-time optimization step directly from the WPA phase.

This option specifies the level of compression used for intermediate language written to LTO object files, and is only meaningful in conjunction with LTO mode (). GCC currently supports two LTO compression algorithms. For zstd, valid values are 0 (no compression) to 19 (maximum compression), while zlib supports values from 0 to 9. Values outside this range are clamped to either minimum or maximum of the supported values. If the option is not given, a default balanced compression setting is used.

Enables the use of a linker plugin during link-time optimization. This option relies on plugin support in the linker, which is available in gold or in GNU ld 2.21 or newer.

This option enables the extraction System Optimizer Archives s object files with GIMPLE bytecode out of library archives. This improves the quality of optimization by exposing more code to the link-time optimizer. This information specifies what symbols can be accessed externally (by non-LTO object or during dynamic linking). Resulting code quality improvements on binaries (and shared libraries that use hidden visibility) are similar to. See for a description of the effect of this flag and how to use it.

This option is enabled by default when LTO support in GCC is enabled and GCC was configured for use with a linker supporting plugins (GNU ld 2.21 or newer or gold).

Fat LTO objects are object files that contain both the intermediate language and the object code. This makes them usable for both LTO linking and normal linking. This option is effective only when compiling with and is ignored at link time.

improves compilation time over plain LTO, but requires the complete toolchain to be aware of LTO. It requires a linker with linker plugin support for basic functionality. Additionally, and need to support linker plugins to allow a full-featured build environment (capable of building static libraries etc). GCC provides the, wrappers to pass the right options to these tools. With non fat LTO makefiles need to be modified to use them.

Note that modern binutils provide plugin auto-load mechanism. Installing the linker plugin into has the same effect as usage of the command wrappers (, and ).

The default is on targets with linker plugin support.

After register allocation and post-register allocation instruction splitting, identify arithmetic instructions that compute processor flags similar to a comparison operation based on that arithmetic. If possible, eliminate the explicit comparison operation.

This pass only applies to certain targets that cannot explicitly represent the comparison operation before register allocation is complete.

Enabled at levels,.

After register allocation and post-register allocation instruction splitting, perform a copy-propagation pass to try to reduce scheduling dependencies and occasionally eliminate the copy.

Enabled at levels,.

Profiles collected using an instrumented binary for multi-threaded programs may be inconsistent due to missed counter updates. When this option is specified, GCC uses heuristics to correct or smooth out such inconsistencies. By default, System Optimizer Archives s, GCC emits an error message when an inconsistent profile is detected.

This option is enabled by.

With all portions of programs not executed during train run are optimized agressively for size rather than speed. In some cases it is not practical to train all possible Registry mechanic 5.0.0.142 crack serial keygen paths in the program. (For example, program may contain functions specific for a given hardware and trianing may not cover all hardware configurations program is run on.) System Optimizer Archives s With profile feedback will be ignored for all functions not executed during the train run leading them to be optimized as if they were compiled without profile feedback. This leads to better performance when train run is not representative but also leads to significantly bigger code.

Enable profile feedback-directed optimizations, and the following optimizations, many of which are generally profitable only with profile feedback available:

-fbranch-probabilities -fprofile-values -funroll-loops -fpeel-loops -ftracer -fvpt -finline-functions -fipa-cp -fipa-cp-clone -fipa-bit-cp -fpredictive-commoning -fsplit-loops -funswitch-loops -fgcse-after-reload -ftree-loop-vectorize -ftree-slp-vectorize -fvect-cost-model=dynamic System Optimizer Archives s -fprofile-reorder-functions

Before you can use this option, you must first generate profiling information. See Instrumentation Options, for information about the option.

By default, GCC emits an error message if the feedback profiles do not match the source code. This error can be turned into a warning by using. Note this may result in poorly optimized code. Additionally, by default, GCC also emits a warning message if the feedback profiles do not exist (see ).

If is specified, GCC looks at the to find the profile feedback data files. See.

Enable sampling-based feedback-directed optimizations, and the following optimizations, System Optimizer Archives s, many of which are generally profitable only with profile feedback available:

-fbranch-probabilities -fprofile-values -funroll-loops -fpeel-loops -ftracer -fvpt -finline-functions -fipa-cp -fipa-cp-clone -fipa-bit-cp -fpredictive-commoning -fsplit-loops -funswitch-loops -fgcse-after-reload -ftree-loop-vectorize -ftree-slp-vectorize -fvect-cost-model=dynamic -ftree-loop-distribute-patterns -fprofile-correction

is the name of a file containing AutoFDO profile information. If omitted, it defaults to in the current directory.

Producing an AutoFDO profile data file requires running your program with the utility on a supported GNU/Linux target system. For more information, see https://perf.wiki.kernel.org/.

E.g, System Optimizer Archives s.

perf record -e br_inst_retired:near_taken -b -o perf.data \ -- your_program

Then use the tool to convert the raw profile data to a format that can be used by GCC.  You must also supply the unstripped binary for your program to this tool. See https://github.com/google/autofdo.

E.g.

create_gcov --binary=your_program.unstripped --profile=perf.data \ --gcov=profile.afdo

The following options control compiler behavior regarding floating-point arithmetic. These options trade off between speed and correctness. All must be specifically enabled.

The following options control optimizations that may improve performance, System Optimizer Archives s, but are not enabled by any options. This section includes experimental options that may produce broken code.

After running a program compiled with (see Instrumentation Options), you can compile it a second time usingSystem Optimizer Archives s improve optimizations based on Serial key Archives - PC Product key number of times each branch was taken, System Optimizer Archives s. When a program compiled with exits, it saves arc execution counts to a file called for each source file. The information in this data file is very dependent on the structure of the generated code, so you must use the same source code and the same optimization options for both compilations.

WithGCC puts a ‘’ note on each ‘’ and ‘&rsquo. These can be used to improve optimization. Currently, they are only used in one place: ininstead of guessing which path a branch is most likely to take, the ‘’ 2000i crack serial keygen are used to exactly determine which path is taken more often.

Enabled by and.

If combined withit adds code so that some data about values of expressions in the program is gathered.

Withit reads back the data gathered from profiling values of expressions for usage in optimizations.

Enabled bySystem Optimizer Archives s,and.

Function reordering based on profile instrumentation collects first time of execution of a function and orders these functions in ascending order.

Enabled withSystem Optimizer Archives s.

If combined withthis option instructs the compiler to add code to gather information about values of expressions, System Optimizer Archives s.

Withit reads back the data gathered and actually performs the optimizations based on them. Currently the optimizations include specialization of division operations using the knowledge about the value of the denominator.

Enabled with and.

Attempt to avoid false dependencies in scheduled code by making use of registers left over after register allocation. System Optimizer Archives s optimization most benefits processors with lots of registers. Depending on the debug information format adopted by the target, however, it can make debugging impossible, since variables no longer stay in a “home register&rdquo.

Enabled by default with.

Performs a target dependent pass over the instruction System Optimizer Archives s to schedule instructions of same type together because target machine can execute them more efficiently if they are adjacent to each other in the instruction flow.

Enabled at levels.

Perform tail duplication to enlarge superblock size. This transformation simplifies the control flow of the function allowing other optimizations to do a better job, System Optimizer Archives s.

Enabled by and.

Unroll loops whose number of iterations can be determined at compile time or upon entry to the loop. implies and. It also turns on complete loop peeling (i.e. complete removal of loops with a small constant number of iterations). This option makes code larger, System Optimizer Archives s, and may or may not make it run faster.

Enabled by and. System Optimizer Archives s all loops, even if their number of iterations is uncertain when the loop is entered. This usually makes programs run more slowly. implies the same options as.

Peels loops for which there is enough information that they do not roll much (from profile feedback or static analysis). It also turns on complete loop peeling (i.e. complete removal System Optimizer Archives s loops with small constant number of iterations).

Enabled by, and.

Enables the loop invariant motion pass in the RTL loop optimizer. Enabled at System Optimizer Archives s and higher, except forSystem Optimizer Archives s.

Enables the loop store motion pass in the GIMPLE loop optimizer. This moves invariant stores to after the end of the loop in exchange for carrying the stored value in a register across the iteration. Note for this option to have an effect has to be enabled as well. Enabled at level and higher, except for.

Split a loop into two if it contains a condition that’s always true for one side of the iteration space and false for the other.

Enabled by and.

Move branches with loop invariant conditions out of the loop, with duplicates of the loop on both branches (modified according to result of the condition).

Enabled by and.

If a loop iterates over an array with a variable stride, create another version of the loop that assumes the stride is always one. For example:

for (int i = 0; i < n; ++i) System Optimizer Archives s * stride] = …;

becomes:

if (stride == 1) for (int i = 0; i < n; ++i) x[i] = …; else for (int i = 0; i < n; ++i) x[i * stride] = …;

This is particularly useful for assumed-shape arrays in Fortran where (for example) it allows better vectorization assuming contiguous accesses. This flag is enabled by default at. It is also enabled by and.

Place each function or data item into its own section in the output file if the target supports arbitrary sections. The name of the function or the name of the data item determines the section’s name in the output file, System Optimizer Archives s.

Use these options on systems where the linker can perform optimizations to improve locality of reference in the instruction space. Most systems using the ELF object format have linkers with such optimizations. On AIX, the linker rearranges sections (CSECTs) based on the call graph. The performance impact varies.

Together with a linker garbage collection (linker option) these options may lead to smaller statically-linked executables (after stripping).

On ELF/DWARF systems these options do not degenerate the quality of the debug information. There could be issues with other object files/debug info formats.

Only use these options when there are significant benefits from doing so. When you specify these options, System Optimizer Archives s, System Optimizer Archives s assembler and linker create larger object and executable files and are also slower. These options System Optimizer Archives s code generation. They prevent optimizations by the compiler and assembler using relative locations inside a translation unit since the locations are unknown until link time. An example of such an optimization is relaxing calls to short call instructions.

Optimize the prologue of variadic argument functions with respect to usage of those arguments.

Try to reduce the number of symbolic address calculations by using shared “anchor” symbols to address nearby objects. This transformation can help to reduce the number of GOT entries and GOT accesses on some targets.

For example, the implementation of the following function :

static int a, b, c; int foo (void) { return a + b + c; }

usually calculates the addresses of all three adobe photoshop cs2, but if you compile it withit accesses the variables from a common anchor point instead. The effect is similar to the following pseudocode (which isn’t valid C):

int foo (void) { register int *xr = &x; return xr[&a - &x] + xr[&b - &x] + xr[&c - &x]; }

Not all targets support this option.

Zero call-used registers at function return to increase program security by either mitigating Return-Oriented Programming (ROP) attacks or preventing information leakage through registers.

The possible values of are the same as for the attribute (see Function Attributes). The default is ‘&rsquo.

You can control this behavior for a specific function by using the function attribute (see Function Attributes).

In some places, GCC uses various constants to control the amount of optimization that is done. For example, GCC does not inline functions that contain more than a certain number of instructions. You can control some of these constants on the command line using the option.

The names of specific parameters, and the meaning of the values, Lumion 10.2 Crack Archives tied to the internals of the compiler, and are subject to change without notice in future releases.

In order to get minimal, maximal and default value of a parameter, one can use options.

In each case, the is an integer. The following choices of are recognized for all targets:

When branch is predicted to be taken with probability lower than this threshold (in percent), then it is considered well predictable.

RTL if-conversion tries to remove conditional branches around a block and replace them with conditionally executed instructions. This parameter gives the maximum number of instructions in a block which should be considered for if-conversion. The compiler will also use other heuristics to decide whether if-conversion is likely to be profitable.

RTL if-conversion will try to remove conditional branches around a block and replace them with conditionally executed instructions. These parameters give the maximum permissible cost for the sequence that would be generated by if-conversion depending on whether the branch is statically determined to be predictable or not. The units for this parameter are the same as those for the GCC internal seq_cost metric. The compiler will try to provide a reasonable default for this parameter using the BRANCH_COST target macro.

The maximum number of incoming edges to consider for cross-jumping. The algorithm used by is O(N^2) in the number of edges incoming to each block. Increasing values mean more aggressive optimization, making the compilation time increase with probably small improvement in executable size.

The minimum number of instructions that must be matched at the end of two Little Snitch Crack 5.1.2 Keygen + License Key Latest [Torrent] 2021 before cross-jumping is performed on them. This value is ignored in the case where all instructions in the block being cross-jumped from are matched.

The maximum code size expansion factor when copying basic blocks instead of jumping. The expansion is relative to a jump instruction.

The maximum number of instructions to duplicate to a block that jumps to a computed goto. To avoid O(N^2) behavior in a number of passes, GCC factors computed gotos early in the compilation process, System Optimizer Archives s, and unfactors them as late as possible. Only computed jumps at the end of a basic blocks with no more than max-goto-duplication-insns are unfactored.

The maximum number of instructions 3DMark 03 Pro 3.2.0 crack serial keygen consider when looking for an instruction to fill a delay slot. System Optimizer Archives s more than this arbitrary number of instructions are searched, the time savings from filling the delay slot are minimal, System Optimizer Archives s, so stop searching. Increasing values mean more aggressive optimization, making the compilation time increase with probably small improvement in execution time.

When trying to fill delay slots, the maximum number of instructions to consider when searching for a block with valid live register information. Increasing this arbitrarily chosen value means more aggressive optimization, increasing the compilation time. This parameter should be removed when the delay slot code is rewritten to maintain the control-flow graph.

The approximate maximum amount of memory in that can be allocated in order to perform the global common subexpression elimination optimization. If more memory than specified is required, the optimization is not done.

If the ratio of expression insertions to deletions is larger than this value for any expression, then RTL PRE inserts or removes the expression and thus leaves partially redundant computations in the instruction stream.

The maximum number of pending dependencies scheduling allows before flushing the current state and starting over. Large functions with few branches or calls can create excessively large lists which needlessly consume memory and resources.

The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop. Larger values can exponentially increase compilation time.

Several parameters control the tree inliner used in GCC. This number sets the maximum number of instructions System Optimizer Archives s in GCC’s internal representation) in a single function that the tree inliner considers for inlining. System Optimizer Archives s This only affects functions declared inline and methods implemented in a class declaration (C++).

When you use (included in ), a lot of functions that would otherwise not be considered for inlining by the compiler are investigated. To those functions, a different (more restrictive) limit compared to functions declared inline can be applied ().

This is bound applied to calls which are considered relevant with.

This is bound applied to calls which are optimized for size. Small growth may be desirable to anticipate optimization oppurtunities exposed by inlining.

Number of instructions accounted by inliner for function overhead such as function prologue and epilogue.

Extra time accounted by inliner for function overhead such as time needed to execute function prologue and epilogue.

The scale (in percents) applied to, when inline heuristics hints that inlining is very profitable (will enable later optimizations).

Same as and but applied to function thunks.

When estimated performance improvement of caller + callee runtime exceeds this threshold (in percent), the function can be inlined regardless of the limit on and.

The limit specifying really large functions. For functions larger than this limit after inlining, inlining is constrained by. This parameter is useful primarily to avoid extreme compilation time caused System Optimizer Archives s non-linear algorithms used by the back end.

Specifies maximal growth of large function caused by inlining in percents. For example, parameter value 100 limits large function growth to 2.0 times the original size.

The limit specifying large translation unit. Growth caused by inlining of units larger than this limit is limited by. For small units this might be too tight. For example, consider a unit consisting of function A that is inline and B that just calls A three times. If B is small relative to A, the growth of unit is 300\% and yet such inlining is very sane. For very large units consisting of small inlineable functions, however, the overall unit growth limit is needed to avoid exponential explosion of code size. Thus for smaller units, the size is increased to before applying.

Maximum number of concurrently open C++ module files when lazy loading.

Specifies maximal overall growth of the compilation unit caused by inlining. For example, parameter value 20 limits unit growth to 1.2 times the original size. Cold functions (either marked cold via an attribute or by profile feedback) are not accounted into the unit size.

Specifies maximal overall growth of the compilation unit caused by interprocedural constant propagation. For example, parameter value 10 limits unit growth to 1.1 times the Sims torrent Archives size.

The size of translation unit that IPA-CP pass considers large.

The limit specifying large stack frames. While inlining the algorithm is trying to not grow past this limit too much.

Specifies maximal growth of large stack frames caused by inlining in percents. For example, parameter value 1000 limits large stack frame growth to 11 times the original size.

Specifies the maximum number of instructions an out-of-line copy of a self-recursive inline function can System Optimizer Archives s into by performing recursive inlining.

applies to functions declared inline. For functions not declared inline, recursive inlining happens only when (included in ) is enabled; applies instead.

Specifies the maximum recursion depth used for recursive inlining.

applies to functions declared inline. For functions not declared inline, recursive inlining happens only when (included in ) is enabled; applies instead.

Recursive inlining is profitable only for function having deep recursion in average and can hurt for function having little recursion depth by increasing the prologue size or complexity of function body to other optimizers.

When profile feedback is available (see ) the actual recursion depth can be guessed from the probability that function recurses via a given call expression. This parameter limits inlining only to call expressions whose probability exceeds the given threshold (in percents).

Specify growth that the early inliner can make. In effect it increases the amount of inlining for code having a large abstraction penalty.

Limit System Optimizer Archives s iterations of the early inliner. This System Optimizer Archives s bounds the number of nested indirect calls the early inliner can resolve. Deeper chains are still handled by late inlining.

Probability (in percent) that C++ inline function with comdat visibility are shared across multiple compilation units.

Specifies the maximal number of base pointers, references and accesses stored for a single function by mod/ref analysis.

Specifies the maxmal number of tests alias oracle can perform to disambiguate memory locations using the mod/ref information. This parameter ought to be bigger than and.

Specifies the maximum depth of DFS walk used by modref escape analysis. Setting to 0 disables the analysis completely.

Specifies the maximum number of escape points tracked by modref per SSA-name.

Specifies the maximum number the access range is enlarged during modref dataflow analysis.

A parameter to control whether to use function internal id in profile database lookup. If the value is 0, System Optimizer Archives s, the compiler uses an id that is based on function assembler name and filename, which makes old profile data more tolerant to source changes such as function reordering etc.

The minimum number of iterations under which loops are not vectorized when is used. The number of iterations after vectorization needs to be greater than the value specified by this option to allow vectorization.

Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations. This is currently supported only in the code hoisting pass. The bigger the ratio, the more aggressive code hoisting is with simple expressions, i.e., the expressions that have cost less than. Specifying 0 disables hoisting of simple expressions.

Cost, roughly measured as the cost of a single typical machine instruction, at which GCSE optimizations do not constrain the distance an expression can travel. This is currently supported only in the code hoisting pass. The lesser the cost, the more aggressive code hoisting is. Specifying 0 allows all expressions to travel unrestricted distances.

The depth of search in the dominator tree for expressions to hoist. This is used to avoid quadratic behavior in hoisting algorithm. The value of 0 does not limit on the search, but may slow down compilation of huge functions.

The maximum amount of similar bbs to compare a bb with. This is used to avoid quadratic behavior in tree tail merging.

The maximum amount of iterations of the pass over the function. This is used to limit compilation time in tree tail merging.

Allow the store merging pass to introduce unaligned stores if it is legal to do so.

The maximum number of stores to attempt to merge into wider stores in the store merging pass, System Optimizer Archives s.

The maximum number of store chains to track at the same time in the attempt to merge them into wider stores in the store merging pass.

The maximum number of stores to track at the same time in the attemt to to merge them into wider stores in the store merging pass.

The maximum number of instructions that a loop may have to be unrolled. If a loop is unrolled, this parameter also determines how many times the loop code is unrolled, System Optimizer Archives s.

The maximum number of instructions biased by probabilities of their execution that a loop may have to be unrolled. If a loop is unrolled, this parameter also determines how many times the loop code is unrolled.

The maximum number of unrollings of a single loop.

The maximum number of instructions that a loop may have to be peeled. If a loop is peeled, this parameter also determines how many times the loop code is peeled.

The maximum number of peelings of a single loop.

The maximum number of branches on the hot path through the peeled sequence.

The maximum number of insns of a completely peeled loop.

The maximum number of iterations of a loop to be suitable for complete peeling.

The maximum depth of a loop nest suitable for complete peeling.

The maximum number of insns corel draw x7 crack Archives an unswitched loop.

The maximum number of branches unswitched in a single loop.

The minimum cost of an expensive expression in the loop invariant motion.

When FDO profile information is available, specifies minimum threshold for probability of semi-invariant condition statement to trigger loop split.

Bound on number of candidates for induction variables, below which all candidates are considered for each use in induction variable optimizations. If there are more candidates than this, only the most relevant System Optimizer Archives s are considered to avoid quadratic time complexity.

The induction variable optimizations give up on loops that contain more induction variable uses.

If the number of candidates in the set is smaller than this value, always try to remove unnecessary ivs from the set when adding a new one.

Average number of iterations of a loop.

Maximum size (in bytes) of objects tracked bytewise by dead store elimination. Larger values may result in larger compilation times.

Maximum number of queries into the alias oracle per store. Larger values result System Optimizer Archives s larger compilation times and may result in more removed dead stores.

Bound on size of expressions used in the scalar evolutions analyzer. Large expressions slow the analyzer.

Bound on the complexity of the expressions in the scalar evolutions analyzer. Complex expressions slow the analyzer.

Maximum number of arguments in a PHI supported by TREE if conversion unless the loop is marked with System Optimizer Archives s pragma.

The maximum number of run-time checks that can be performed when doing loop versioning for alignment in the vectorizer.

The maximum number of run-time checks that can be performed when Pycharm activation key Archives loop versioning for alias in the vectorizer.

The System Optimizer Archives s number of loop peels to enhance access alignment for vectorizer. Value -1 means no limit.

The maximum number of iterations of a loop the brute-force algorithm for analysis of the number of iterations of the loop tries to evaluate, System Optimizer Archives s.

The denominator n of fraction 1/n of the maximal execution count of a basic block in the entire program that a basic block needs to at least have in order to be considered hot. The default is 10000, which means that a basic block is considered hot if its execution count is greater than 1/10000 of the maximal execution count. 0 means that it is never considered hot. Used in non-LTO mode.

The number of most executed permilles, ranging from 0 to 1000, of the profiled execution of the entire program to which the execution count of a basic block must be part of in order to be considered hot. The default is 990, which means that a basic block is considered hot if its execution count contributes to the upper 990 permilles, or 99.0%, of the profiled execution of the entire program. 0 means that it is never considered hot. Used in LTO mode.

The denominator n of fraction 1/n of the execution frequency of the entry block of a function that a basic block of this function needs to at least have in order to be considered hot. The default is 1000, which System Optimizer Archives s that a basic block is considered hot in a function if it is executed more frequently than 1/1000 of the frequency of the entry block of the function. 0 means that it is never considered hot.

The denominator n of fraction 1/n of the number of profiled runs of the entire program below which the execution count of a basic block must be in order for the basic block to be considered unlikely executed. The default is 20, which means that a basic block is considered unlikely executed if it is executed in fewer than 1/20, or 5%, of the runs of the program. 0 means that it is always considered unlikely executed.

The maximum number of loop iterations we predict statically. This is useful in cases where a function contains a single loop with known bound and another loop with unknown bound. The known number of iterations is predicted correctly, while the unknown number of iterations average to roughly 10. This means that the loop without bounds appears artificially cold relative to the other one.

Control the dfx audio enhancer full crack Archives of the expression having the specified value. This parameter takes a percentage (i.e. 0 . 100) as input.

The maximum System Optimizer Archives s of a constant string for a builtin string cmp call eligible for inlining.

Select fraction of the maximal frequency of executions of a basic block in a function to align the basic block.

A loop expected to iterate at least the selected number of iterations is aligned.

This value is used to limit superblock formation once the given percentage of executed instructions is covered. This limits unnecessary code size expansion.

The parameter is used only when profile feedback is available. The real profiles (as opposed to statically estimated ones) are much less balanced allowing the threshold to be larger value.

Stop tail duplication once code growth has reached given percentage. This is a rather artificial limit, as most of the duplicates are eliminated later in cross jumping, so it may be set to much higher values than is the desired code growth.

Stop reverse growth when the reverse probability of best edge is less than this threshold (in percent).

Stop forward growth if the best edge has probability lower than this threshold.

Similarly to two parameters are provided. is used for compilation with profile System Optimizer Archives s and compilation without. The value for compilation with profile feedback needs to be more conservative (higher) in order to make tracer effective.

Specify the size of the operating system provided stack guard as 2 raised to bytes. Higher values may reduce the number of explicit probes, but a value larger than the operating system provided guard will leave code vulnerable to stack clash style attacks.

Stack clash protection involves probing stack space as it is allocated. This param controls the maximum distance between probes into the stack as 2 raised to bytes. Higher values may reduce the number of explicit probes, but a value larger than the operating system provided guard will leave code vulnerable to stack clash style attacks. System Optimizer Archives s maximum number of basic blocks on path that CSE considers.

The maximum number of instructions CSE navicat download free Archives - Patch Cracks before flushing.

GCC uses a garbage collector to manage its own memory allocation. This parameter specifies the minimum percentage by which the garbage collector’s heap should be allowed to expand between collections. Tuning this may improve compilation speed; it has no effect on code generation.

The default is 30% + 70% * (RAM/1GB) with Sketch 76.1 Crack + License Key 100% Working (2D&3D) upper bound of 100% when RAM >= 1GB. If is available, the notion of “RAM” is the smallest of actual RAM and or. If GCC is not able to calculate RAM on a particular platform, the lower bound of 30% is used. Setting this parameter and to zero causes a full collection to occur at every opportunity. This is extremely slow, but can be useful for debugging.

Minimum size of the garbage collector’s heap before it begins bothering to collect garbage. The first collection occurs after the heap expands by % beyond. Again, tuning this may improve compilation speed, and has no effect on code generation.

The default is the smaller of RAM/8, RLIMIT_RSS, or a limit that tries to ensure that RLIMIT_DATA or RLIMIT_AS are not exceeded, but with a lower bound of 4096 (four megabytes) and an upper bound of 131072 (128 megabytes). If GCC is not able to calculate RAM on a particular platform, the lower bound is used. Setting this parameter very large effectively disables garbage collection. Setting this parameter and to zero causes a full collection to occur at every opportunity.

The maximum number of instruction reload should look backward for equivalent register, System Optimizer Archives s. Increasing values mean more aggressive optimization, making the compilation time increase with probably slightly better performance.

The maximum number of memory locations cselib should take into account. Increasing values mean more aggressive optimization, System Optimizer Archives s, making the compilation time increase with probably slightly better performance.

The maximum number of instructions ready to be issued the scheduler should consider at any given time during the first scheduling pass, System Optimizer Archives s. Increasing values mean more thorough searches, making the compilation time increase with probably little benefit.

The maximum number of blocks in a region to be considered for interblock scheduling.

The maximum number of blocks in a region to be considered for pipelining in the selective scheduler.

The maximum number of insns in a region to be considered for interblock scheduling.

The maximum number of insns in a region to be considered for pipelining in the selective scheduler.

The minimum probability (in percents) of reaching a source block for interblock speculative scheduling.

The maximum number of iterations through CFG to extend regions. A value of 0 disables region extensions.

The maximum conflict delay for an insn to be considered for speculative motion.

The minimal probability of speculation success (in percents), so that speculative insns are scheduled.

The minimum probability an edge must have for the scheduler to save its state across it.

Minimal distance (in CPU cycles) between store and load targeting same memory locations.

The maximum size of the lookahead window of selective scheduling. It is a depth of search for available instructions.

The maximum number of times that an instruction is scheduled during selective scheduling. This is the limit on the number of iterations through which the instruction may be pipelined.

The maximum number of best instructions in the ready list that are considered for renaming in the selective scheduler.

The minimum value of stage count that swing modulo scheduler generates.

The maximum size measured as number of RTLs that can be recorded in an expression in combiner for a pseudo register as last known value of that register.

The maximum number of instructions the RTL combiner tries to combine.

Small integer constants can use a shared data structure, reducing the compiler’s memory usage and increasing its speed. This sets the maximum value of a shared integer constant.

The minimum size of buffers (i.e. arrays) that receive stack smashing protection when is used.

The minimum size of variables taking part in stack slot sharing when not optimizing.

Maximum number of statements allowed in a block that needs to be duplicated when threading jumps.

Maximum number of fields in a structure treated in a field sensitive manner during pointer analysis.

Estimate on average number of instructions that are executed before prefetch finishes. The distance prefetched ahead is proportional to this constant. Increasing this number may also lead to less streams being prefetched (see ).

Maximum number of prefetches that can run at the same time.

The size of cache line in L1 data cache, in bytes.

The size of L1 data cache, in kilobytes.

The size of L2 data cache, in kilobytes.

Whether the loop array prefetch pass should issue software prefetch hints for strides that are non-constant. In some cases this may be beneficial, though the fact the stride is non-constant may make it hard to predict when there is clear benefit to issuing these hints, System Optimizer Archives s.

Set to 1 if the prefetch hints should be issued for non-constant strides. Set to 0 if prefetch hints should be issued only for strides that are known to be constant and below.

Minimum constant stride, in bytes, to start using prefetch hints for. If the stride is less than this threshold, prefetch hints will not be issued.

This setting is useful for processors that have hardware prefetchers, in which case there may be conflicts between the hardware prefetchers and the software prefetchers. If the hardware prefetchers have a maximum stride they can handle, it should be used here to improve the use of software prefetchers.

A value of -1 means we don’t have a threshold and therefore prefetch hints can be issued for any constant stride.

This setting is only useful for strides that are known and System Optimizer Archives s.

The values for the C++17 variables andSystem Optimizer Archives s. The destructive interference size is the minimum recommended offset between two independent concurrently-accessed objects; the constructive interference size is the maximum recommended size of contiguous memory accessed together. Typically both will be the size of an L1 cache line for the target, in bytes. For a generic target covering a range of L1 cache line sizes, typically the constructive interference size will be the small end of the range and the destructive size will be the large end.

The destructive interference size Your Uninstaller! 2006 PRO 5.0.0.361 crack serial keygen intended to be used for layout, and thus has ABI impact. The default value is not expected to be stable, and on some targets varies withso use of this variable in a context where ABI stability is important, such as the public interface of a library, is strongly discouraged; if it is used in that context, System Optimizer Archives s, users can stabilize the value using this option.

The constructive interference size is less sensitive, as it is typically only used in a ‘’ to make sure that a type fits within a cache line.

See also.

The maximum number of stmts in a loop to be interchanged.

The minimum ratio between stride of two loops for interchange to be profitable.

The minimum ratio between the number of instructions and the number of prefetches to enable prefetching in a loop.

The minimum ratio between the number of instructions and the number of memory references to enable prefetching in a loop.

Whether the compiler should use the “canonical” type system. Should always be 1, which uses a more efficient internal mechanism for comparing types in C++ and Objective-C++. However, if bugs in the canonical type system are causing compilation failures, set this value to 0 to disable canonical types.

Switch initialization conversion refuses to create arrays that are bigger than times the number of branches in the switch.

Maximum length of the partial antic set computed during the tree partial System Optimizer Archives s elimination optimization () when optimizing at and above, System Optimizer Archives s. For some sorts of source code the enhanced partial redundancy elimination optimization can run away, consuming all of the memory available on the host machine. This parameter sets a limit on the length of the sets that are computed, PC Optimization Archives prevents the runaway behavior. Setting a value of 0 for this parameter allows an unlimited set length.

Maximum loop depth that is value-numbered optimistically. When the limit hits the innermost loops and the outermost loop in the loop nest are value-numbered optimistically and the remaining ones not.

Maximum number of alias-oracle queries we perform when looking for redundancies for loads and stores. If this limit is hit the search is aborted and the load or store is not considered redundant. The number of queries is algorithmically limited to the number of stores on all paths from the load to the function entry.

IRA uses regional register allocation by default. If a function contains more loops than the number given by this parameter, only at most the given number of the most frequently-executed loops form regions for regional register allocation.

Although IRA uses a sophisticated algorithm to compress the conflict table, the table can still require excessive amounts of memory for huge functions. If the conflict table for a function could be more than the size in MB given by this parameter, the register allocator instead uses a faster, simpler, and lower-quality algorithm that does not require building a pseudo-register conflict table, System Optimizer Archives s.

IRA can be used to evaluate more accurate register pressure in loops for decisions to move loop invariants (see ). The number of available registers reserved for some other purposes is given by this parameter. Default of the parameter is the best found from numerous experiments.

Make IRA to consider matching constraint (duplicated operand number) heavily in all available alternatives for preferred register class. If it is set as zero, it means IRA only respects the matching constraint when it’s in the only available alternative with an appropriate register class. Otherwise, it means IRA will check all available alternatives for preferred register class even if it has found some choice with an appropriate register class and respect the found qualified matching constraint.

LRA tries to reuse values reloaded in registers in subsequent insns. This optimization System Optimizer Archives s called inheritance. EBB is used as a region to do this optimization, System Optimizer Archives s. The parameter defines a minimal fall-through edge probability in percentage used to add BB to inheritance EBB in LRA. The default value was chosen from numerous runs of SPEC2000 on x86-64.

Loop invariant motion can be very expensive, both in compilation time and in amount of needed compile-time memory, with very large loops. Loops with more basic blocks than this parameter won’t have loop invariant motion optimization performed on them.

Building data dependencies is expensive for very large loops. This parameter limits the number System Optimizer Archives s data references in System Optimizer Archives s that are considered for data dependence analysis. These large loops are no handled by the optimizations using loop data dependencies.

Sets a maximum number of hash table slots to use during variable tracking dataflow analysis of any function. If this limit is exceeded with variable tracking at assignments enabled, analysis for that function is retried without it, after removing all debug insns from the function. If the limit is exceeded even without debug insns, var tracking analysis is completely disabled for the function. Setting the parameter to zero makes it unlimited.

Sets a maximum number of recursion levels System Optimizer Archives s attempting to map variable names or debug temporaries to value expressions. This trades compilation time for more complete debug information. If this is set too low, value expressions that are available and could be represented in debug information may end up not being used; setting this higher may enable the compiler to find more complex debug expressions, System Optimizer Archives s compile time and memory use may grow, System Optimizer Archives s.

Sets a threshold on the number of debug markers (e.g. begin stmt markers) to avoid complexity explosion at inlining or expanding to RTL. If a function has more such gimple stmts than the set limit, such stmts will be dropped from the inlined copy of a function, and from its RTL expansion, System Optimizer Archives s.

Use uids starting at this parameter for nondebug insns. The range below the parameter is reserved exclusively for debug insns created bybut debug insns may get (non-overlapping) uids above it if the reserved range is exhausted.

IPA-SRA replaces a pointer to an aggregate with one or more new parameters only when their cumulative size is less or equal to times the size of the original pointer parameter.

Maximum pieces of an aggregate that IPA-SRA tracks. As a consequence, it is also the maximum number of replacements of a formal parameter.

The two Scalar Reduction of Aggregates passes (SRA and IPA-SRA) aim to replace scalar parts of aggregates with System Optimizer Archives s of independent scalar variables. These parameters control the maximum size, in storage units, of aggregate which is considered for replacement when compiling for speed () or size () respectively.

The maximum number of artificial accesses that Scalar Replacement of Aggregates (SRA) will track, per one local variable, in order to facilitate copy propagation.

When making copies of thread-local variables in a transaction, this parameter specifies the size in bytes after which variables are saved with the logging functions as opposed to save/restore code sequence pairs. This option only applies when using.

To avoid exponential effects in the Graphite loop transforms, the number of parameters in a Static Control Part (SCoP) is bounded. A value of zero can be used to lift the bound. A variable whose value is unknown at compilation time and defined outside a SCoP is a parameter of the SCoP, System Optimizer Archives s.

Loop blocking or strip mining transforms, enabled with orstrip mine each loop in the loop nest by a given number of iterations. The strip length can be changed using the parameter.

Specifies number of statements visited during jump function offset discovery.

IPA-CP attempts to track all possible values and types passed System Optimizer Archives s a function’s parameter in order to propagate them and perform devirtualization. is the maximum number of values and types it stores per one formal parameter of a function.

IPA-CP calculates its own score of cloning profitability heuristics and performs those cloning opportunities with scores that exceed.

Maximum depth of recursive cloning for self-recursive function.

Recursive cloning only when the probability of call being executed exceeds the parameter.

When using option, IPA-CP will consider the measured execution count of a call graph edge at this percentage position in their histogram as the basis for its heuristics calculation.

The number of times interprocedural copy propagation expects recursive functions to call themselves.

Percentage penalty the recursive functions will receive when they are evaluated for cloning.

Percentage penalty functions containing a single call to another function will receive when they are evaluated for cloning. System Optimizer Archives s is also capable to propagate a number of scalar values passed in an aggregate. controls the maximum number of such values per one parameter.

When IPA-CP determines that a cloning candidate would make the number of iterations of a loop known, it adds a bonus of to the profitability score of the candidate.

The maximum number of different predicates IPA will use to describe when loops in a function have known properties.

During its analysis of function bodies, IPA-CP employs alias analysis in order to track values pointed to by function parameters. In order not spend too much time analyzing huge functions, it gives up and consider all memory clobbered after examining statements modifying memory, System Optimizer Archives s.

Maximal number of boundary endpoints of case ranges of switch statement. For switch exceeding this limit, IPA-CP will not construct cloning cost predicate, which is used to estimate cloning benefit, for default case of the switch statement.

IPA-CP will analyze conditional statement that references some function parameter to estimate benefit for cloning upon certain constant value. But if System Optimizer Archives s of operations in a parameter expression exceedsthe expression is treated as complicated one, System Optimizer Archives s, and is not handled by IPA analysis.

Specify desired number of partitions produced during WHOPR compilation. The number System Optimizer Archives s partitions should exceed System Optimizer Archives s number of CPUs used for compilation.

Size of minimal partition for WHOPR (in estimated instructions). This prevents expenses of splitting very small programs into too many partitions.

Size of max partition for WHOPR (in estimated instructions). to provide an upper bound for individual size of partition. Meant to be used only with balanced partitioning.

Maximal number of parallel processes used for LTO streaming.

The maximum number of namespaces to consult for suggestions when C++ name lookup fails for an identifier.

The maximum relative execution frequency (in percents) of the target block relative to a statement’s original block to allow statement sinking of a statement. Larger numbers result in more aggressive statement sinking. A small positive adjustment is applied for statements with memory operands as those are even more profitable so sink.

The maximum number of conditional store pairs that can be sunk. Set to 0 if either vectorization () or if-conversion () is disabled.

The smallest System Optimizer Archives s of different values for which it is best to use a jump-table instead of a tree of conditional branches. If the value is 0, use the default for the machine.

The maximum code size growth ratio when expanding System Optimizer Archives s a jump table (in percent). The parameter is used when optimizing for size.

The maximum code size growth ratio when expanding into a jump table (in percent). The parameter is used when optimizing for speed.

Set the maximum number of instructions executed in parallel in reassociated tree. This parameter overrides target dependent heuristics used by default if has non zero value.

Choose between the two available implementations ofSystem Optimizer Archives s. Algorithm 1 is the original implementation and is the more likely to prevent instructions from being reordered. Algorithm 2 was designed to be a compromise between the relatively conservative approach taken by algorithm 1 and the rather aggressive approach taken by the default scheduler. It relies more heavily on having a regular register file and accurate register pressure classes. See in the GCC sources for more details.

The default choice depends on the target.

Set the maximum number of existing candidates that are considered when seeking a basis for a new straight-line strength reduction candidate.

Enable buffer overflow detection for global objects. This kind of protection is enabled by default if you are using option. To disable global objects protection use.

Enable buffer overflow detection for stack objects. This kind of protection is enabled by default when using. To disable stack protection use option.

Enable buffer overflow detection for memory reads. This kind of protection is enabled by default when using. To disable memory reads protection use.

Enable buffer overflow detection for memory writes. This kind of protection is enabled by default when using. To disable memory writes protection use option.

Enable detection for built-in functions. This kind of protection is enabled by default when usingSystem Optimizer Archives s. To disable built-in functions protection use.

Enable detection of use-after-return. This kind of protection is enabled by default when using the option. To disable it use.

Note: By default the check is disabled at run time. To enable it, add to the environment variable.

If number of memory accesses in function being instrumented is greater or equal to this number, use callbacks instead of inline checks. E.g. to disable inline code use.

Enable hwasan instrumentation of statically sized stack-allocated variables. This kind of instrumentation System Optimizer Archives s enabled by default when using and disabled by default when using. To disable stack instrumentation useand to enable it use.

When using stack instrumentation, decide tags for stack variables using a deterministic sequence beginning at a random tag for each frame. With this parameter unset tags are chosen using the same sequence but beginning from 1. This is enabled by default for and unavailable for. To disable it use.

Enable hwasan instrumentation of dynamically sized stack-allocated variables. This kind of instrumentation is enabled by default when using and disabled by default when using. To disable instrumentation of such variables useand to enable it use.

Enable hwasan checks on memory reads. Instrumentation of reads is enabled by default for both and. To disable checking memory reads use.

Enable hwasan checks on memory writes. Instrumentation of writes is enabled by default for both and. To disable checking memory writes use.

Enable hwasan instrumentation of builtin functions. Instrumentation of these builtin functions is enabled by default for both and. To disable instrumentation of builtin functions use.

If the size of a local variable in bytes is smaller or equal to this number, directly poison (or unpoison) shadow memory instead of using run-time callbacks.

Emit special instrumentation for accesses to volatiles.

Emit instrumentation calls to __tsan_func_entry() and __tsan_func_exit().

Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path.

Maximum number of basic blocks on a jump thread path.

threader-debug=[none

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Best Junk And Temp File Cleaners For Windows 10 PC (And Other Windows Variants)

Sl.NOWindows 10 Junk CleanerPriceInstallation linkFeatures At A Glance
1.Advanced System Optimizer$ 49.95Download Advanced System OptimizerDedicated malware removal module, startup manager, disk cleanup, removes fragments from drives, efficient file shredder
2.Advanced PC Cleanup$ 35.95Download Advanced PC CleanupRemoves junk and temporary files, sort startup items, uninstall unwanted apps, fixes registry
3.AVG PC TuneUp$ 24.99Download AVG TuneUpCleans cache, removes browser cookies, puts unwanted programs to sleep, removes unnecessary programs
4.IObit Advanced SystemCare 14 Pro$ 19.99/ yearDownload Advanced SystemCare 14 ProAI mode for better PC Cleaning, automatically shuts down unwanted processes, removes online traces, deep cleans registry.
5.Avast Cleanup$ 29.99/ yearDownload Avast CleanupRemoves unwanted programs or puts them in quarantine, System Optimizer Archives s, cleans registries
6.CleanMyPC From MacPaw$ 39.95Download MacPaw CleanMyPCDeletes hibernation files, removes autorun files that hamper boot time, removes online traces, helps get rid of disk fragments.
7.BleachBitFreeDownload BleachBitPortable, offers vacuuming, removes unnecessary files and reduces backup size, overwrites free disk space

1. Advanced System Optimizer – A Cleaner That Doubles up As An Optimizer

To remove junk files from Windows 10, Advanced System Optimizer is indeed a great option. Actually, Advanced System Optimizer does much more than just cleaning junk files. It optimizes your Windows 10 PC for best performance.

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Read The Complete Review Of Advanced System Optimizer

Features:

  • Cleans unwanted data in the form of cache, temporary fies, log files, etc
  • Helps remove privacy traces exposed by browsers
  • Removes fragments from Nero 7.9.0 crack serial keygen thereby improving the turnaround time
  • Completely wipes off files and folders, making them completely irrecoverable
  • It has a dedicated system protector which removes malware
  • It has a startup manager which removes unwanted programs from the startup
  • Comes with a game optimizer module which offers System Optimizer Archives s a sandbox mode and frees up RAM for best gaming experience

Price: $ 49.95

Compatibility: Windows 10/8.1/8/7

2. Advanced PC Cleanup – The Best Overall Junk Cleaner For Windows 10

Advanced PC Cleanup

Advanced PC Cleanup is one of the best junk file cleaners for Windows 10 PC which helps you get rid of temporary files as well. It is powered with several modules that can help optimize your PC and boost its startup time.

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Read The Complete Review Of Advanced PC Cleanup Here

Advanced PC Tuneup - Infographic

Features:

  • Easy to use interface
  • Get rid of log files, temporary files, invalid registry files and other trash with just one click
  • Intelligently clean registry items or add them to exclusion list
  • Sort PC slowing startup items
  • Uninstall apps which you don’t need
  • Easily get rid of unused old downloads which take up a lot of space on your computer

Price: $ 35.95

Compatibility – Windows 10/8.1/8/7/XP/Vista

3. AVG TuneUp

AVG tuneup

Download AVG TuneUp

We all probably know AVG TuneUp as one of the best tuneup utilities for Windows but, it is also a powerful Windows 10 junk file cleaner too. Apart from removing unnecessary junk files, it also updates the programs on your PC automatically.

Features:

  • Automatically fixes any registry issues and prevents crashes and errors
  • Puts programs to sleep when they are not needed thereby saving CPU and memory
  • Helps get rid of unnecessary programs and bloatware
  • Automatically cleans cache files, tracking cookies and browser traces

Price: $ 24.99/ year

Compatibility: Windows 10/8.1/8/7

4. IObit Advanced SystemCare 14 Pro

IObit Advanced SystemCare 14 Pro

Download IObit Advanced SystemCare 14 Pro

Looking for a way to delete junk files in Windows 10, System Optimizer Archives s, IObit Advanced SystemCare 14 is an option, you should definitely consider. The free version itself cleans cache, junk files and cookies in a comprehensive manner. And, when you sign-up System Optimizer Archives s a premium version, its PC Cleanup module cleans 120% more junk files than the previous versions.

Features:

  • Deep cleans registry System Optimizer Archives s prevents any crashes
  • Utilizes smart AI mode for better PC cleaning
  • Removes any online traces that PhotoPad Image Editor Pro 7.59 Crack With Key 2022 Download put your personal data in jeopardy
  • Automatically shuts down unused processes and programs
  • Updates programs System Optimizer Archives s a single click

Price: $ 19.99/ year

Compatibility: Windows 10/8/7/Vista/XP

5. CleanMyPC

CleanmyPC

Download MacPaw Axure license key crack Archives number 4 of our list of Windows 10 junk cleaners is CleanMyPC from MacPaw which helps you clean junk files, useless toolbars and fragments from your hard drive and resolve any registry issues without a hiccup.

Features:

  • Helps you get rid of hibernation files easily
  • Removes the app residues
  • Disables autoruns items which hamper boot time
  • Tracks and gets rid of online traces
  • Intelligently spots and turns off any add-ons which are unnecessary
  • Shreds files in a manner that they can’t be recovered

Price: Starts at $ 39.95

Compatibility: Windows 7 and above

6. Avast Cleanup

Avast Cleanup

Download Avast Cleanup

When a product comes from Avast, you know it has to be credible. And, standing true to its name, Avast Cleanup doesn’t disappoint you as a commendable Windows 10 junk file cleaner. It scans your PC inside out and deletes all kinds of junk System Optimizer Archives s in Windows 10.

Features:

  • Intelligently remove unwanted programs or put them in quarantine
  • Defrags SSD and HDD
  • Tackles and cleans registries with utmost ease
  • Clears up online traces from over 25 browsers such as Chrome, Firefox and many others
  • Get rid of unnecessary plugins and toolbars
  • Updates outdated apps

Price: $ 29.99/ year

7. BleachBit – Best Free And Open Source Junk And Temp File Cleaner For Windows 10

BleachBit - Temp File Cleaner

Download BleachBit

BleachBit is a Windows 10 junk cleaner for which temporary files, cache files, unwanted logs and other junk is Flight factor 757 crack serial keygen. One of the greatest aspects of BleachBit is that it is an open source application System Optimizer Archives s it also has one of the simplest interfaces.

Features:

  • It shreds files in such a manner that they can’t ever be recovered
  • Hide previously deleted and overwrite any free disk space
  • It is portable i.e. you can run it without installing it
  • Use vacuuming to improve your PC’s performance
  • Reduce backup size by removing unnecessary files

Price: Free

Compatibility: Windows 10/8/7/Vista/XP

Frequently Asked Questions

Is It Safe To Remove Junk Files From The Computer?

Yes, System Optimizer Archives s, it is and it is highly advisable that you remove junk from your computer timely. Having said, you should be careful in deleting junk and thereby take help of a dedicated junk cleaner tool like Advanced System Optimizer or Advanced PC Cleanup.

Which Is The Best Junk File Cleaner For Windows 10?

We have handpicked some of the best junk and temp file cleaners for your Windows PC. But, if you are looking for an easy way to delete unwanted items from your computer you can give Advanced System Optimizer a try and be rest assured that you won’t at all be disappointed.

How To Delete Unwanted Files In Windows 10?

As a prudent computer user if you want to delete unwanted items from your computer you can either take the manual route or use one of the junk cleanup utilities mentioned above. We however recommend that you inculcate both in your strategy.

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Источник: [https://torrent-igruha.org/3551-portal.html]
System Optimizer Archives s

System Optimizer Archives s - phrase and

Advanced System Optimizer

Advanced System Optimizer (formerly Advanced Vista Optimizer) is a software utility for Microsoft Windows developed by Systweak (a company founded in 1999 by Mr. Shrishail Rana[who?]). It is used to improve computer performance and speed.[1]

Advanced System Optimizer has been reviewed by PCworld,[2]Cnet,[3]G2,[4] and Yahoo.[5]

Features[edit]

Advanced System Optimizer has utilities for optimization, speedup, cleanup, memory management, etc.[6] Its utilities include system cleaners, system and memory optimizers, junk file cleaners, privacy protectors, startup managers, security tools and other maintenance tools.,[7] repair missing or broken DLLs and includes a file eraser. There's a "what's recommended" link, which is used to find the problems on the PC, to give info on how to speed up the computer, or to show settings of various program features with the scheduler.[8]

The "Single Click Care" option scans the computer for optimization all areas of the computer. This program features an "Optimization" tab, which is used for memory optimization and to free up memory of the computer. The startup manager feature of this program is used to manage programs that load at the computer's startup.[8]

The registry cleaner has 12 categories of registry errors and can detect and delete registry errors.[9]

The 2008 version had over 25 tools. It can be scheduled to run optimization without the need for user intervention.[10]

Reception[edit]

In a review syndicated to The Washington Post,[11]PC World praised the quality of the suite's design, stating the tools perform as advertised. The reviewer did however note the product's price as one drawback.[7]PC Advisor also praised the package's functionality, but warned readers they would have to decide for themselves whether it is worth the price considering the availability of free alternatives.[12]

Alternatives[edit]

At present users now have several choices to buy better tools for their computer and carry out optimization, privacy protection on their computer. Some of the alternatives are: SafeSoft PC Cleaner CCleaner[original research?]

References[edit]

External links[edit]

Источник: [https://torrent-igruha.org/3551-portal.html]
all] Enables verbose dumping of the threader solver.

Chunk size of omp schedule for loops parallelized by parloops.

Schedule type of omp schedule for loops parallelized by parloops (static, dynamic, guided, auto, runtime).

The minimum number of iterations per thread of an innermost parallelized loop for which the parallelized variant is preferred over the single threaded one. Note that for a parallelized loop nest the minimum number of iterations of the outermost loop per thread is two.

Maximum depth of recursion when querying properties of SSA names in things like fold routines. One level of recursion corresponds to following a use-def chain.

The maximum number of may-defs we analyze when looking for a must-def specifying the dynamic type of an object that invokes a virtual call we may be able to devirtualize speculatively.

The maximum number of assertions to add along the default edge of a switch statement during VRP.

Maximum number of basic blocks before EVRP uses a sparse cache.

Specifies the mode Early VRP should operate in.

Specifies the mode VRP pass 1 should operate in.

Specifies the mode VRP pass 2 should operate in.

Specifies the type of debug output to be issued for ranges.

Specifies the maximum number of switch cases before EVRP ignores a switch.

Источник: [https://torrent-igruha.org/3551-portal.html]

These options control various sorts of optimizations.

Without any optimization option, the compiler’s goal is to reduce the cost of compilation and to make debugging produce the expected results. Statements are independent: if you stop the program with a breakpoint between statements, you can then assign a new value to any variable or change the program counter to any other statement in the function and get exactly the results you expect from the source code.

Turning on optimization flags makes the compiler attempt to improve the performance and/or code size at the expense of compilation time and possibly the ability to debug the program.

The compiler performs optimization based on the knowledge it has of the program. Compiling multiple files at once to a single output file mode allows the compiler to use information gained from all of the files when compiling each of them.

Not all optimizations are controlled directly by a flag. Only optimizations that have a flag are listed in this section.

Most optimizations are completely disabled at or if an level is not set on the command line, even if individual optimization flags are specified. Similarly, suppresses many optimization passes.

Depending on the target and how GCC was configured, a slightly different set of optimizations may be enabled at each level than those listed here. You can invoke GCC with to find out the exact set of optimizations that are enabled at each level. See Overall Options, for examples.

If you use multiple options, with or without level numbers, the last such option is the one that is effective.

Options of the form specify machine-independent flags. Most flags have both positive and negative forms; the negative form of is . In the table below, only one of the forms is listed—the one you typically use. You can figure out the other form by either removing ‘’ or adding it.

The following options control specific optimizations. They are either activated by options or are related to ones that are. You can use the following flags in the rare cases when “fine-tuning” of optimizations to be performed is desired.

For machines that must pop arguments after a function call, always pop the arguments as soon as each function returns. At levels and higher, is the default; this allows the compiler to let arguments accumulate on the stack for several function calls and pop them all at once.

Perform a forward propagation pass on RTL. The pass tries to combine two instructions and checks if the result can be simplified. If loop unrolling is active, two passes are performed and the second is scheduled after loop unrolling.

This option is enabled by default at optimization levels , , , .

disables floating-point expression contraction. enables floating-point expression contraction such as forming of fused multiply-add operations if the target has native support for them. enables floating-point expression contraction if allowed by the language standard. This is currently not implemented and treated equal to .

The default is .

Omit the frame pointer in functions that don’t need one. This avoids the instructions to save, set up and restore the frame pointer; on many targets it also makes an extra register available.

On some targets this flag has no effect because the standard calling sequence always uses a frame pointer, so it cannot be omitted.

Note that doesn’t guarantee the frame pointer is used in all functions. Several targets always omit the frame pointer in leaf functions.

Enabled by default at and higher.

Optimize sibling and tail recursive calls.

Enabled at levels , , .

Optimize various standard C string functions (e.g. , or ) and their counterparts into faster alternatives.

Enabled at levels , .

Do not expand any functions inline apart from those marked with the attribute. This is the default when not optimizing.

Single functions can be exempted from inlining by marking them with the attribute.

Integrate functions into their callers when their body is smaller than expected function call code (so overall size of program gets smaller). The compiler heuristically decides which functions are simple enough to be worth integrating in this way. This inlining applies to all functions, even those not declared inline.

Enabled at levels , , .

Inline also indirect calls that are discovered to be known at compile time thanks to previous inlining. This option has any effect only when inlining itself is turned on by the or options.

Enabled at levels , , .

Consider all functions for inlining, even if they are not declared inline. The compiler heuristically decides which functions are worth integrating in this way.

If all calls to a given function are integrated, and the function is declared , then the function is normally not output as assembler code in its own right.

Enabled at levels , , . Also enabled by and .

Consider all functions called once for inlining into their caller even if they are not marked . If a call to a given function is integrated, then the function is not output as assembler code in its own right.

Enabled at levels , , and , but not .

Inline functions marked by and functions whose body seems smaller than the function call overhead early before doing instrumentation and real inlining pass. Doing so makes profiling significantly cheaper and usually inlining faster on programs having large chains of nested wrapper functions.

Enabled by default.

Perform interprocedural scalar replacement of aggregates, removal of unused parameters and replacement of parameters passed by reference by parameters passed by value.

Enabled at levels , and .

By default, GCC limits the size of functions that can be inlined. This flag allows coarse control of this limit. is the size of functions that can be inlined in number of pseudo instructions.

Inlining is actually controlled by a number of parameters, which may be specified individually by using . The option sets some of these parameters as follows:

is set to /2.

is set to /2.

See below for a documentation of the individual parameters controlling inlining and for the defaults of these parameters.

Note: there may be no value to that results in default behavior.

Note: pseudo instruction represents, in this particular context, an abstract measurement of function’s size. In no way does it represent a count of assembly instructions and as such its exact meaning might change from one release to an another.

This is a more fine-grained version of , which applies only to functions that are declared using the attribute or declspec. See Declaring Attributes of Functions.

In C, emit functions that are declared into the object file, even if the function has been inlined into all of its callers. This switch does not affect functions using the extension in GNU C90. In C++, emit any and all inline functions into the object file.

Emit functions into the object file, even if the function is never used.

Emit variables declared when optimization isn’t turned on, even if the variables aren’t referenced.

GCC enables this option by default. If you want to force the compiler to check if a variable is referenced, regardless of whether or not optimization is turned on, use the option.

Attempt to merge identical constants (string constants and floating-point constants) across compilation units.

This option is the default for optimized compilation if the assembler and linker support it. Use to inhibit this behavior.

Enabled at levels , , , .

Attempt to merge identical constants and identical variables.

This option implies . In addition to this considers e.g. even constant initialized arrays or initialized constant variables with integral or floating-point types. Languages like C or C++ require each variable, including multiple instances of the same variable in recursive calls, to have distinct locations, so using this option results in non-conforming behavior.

Perform swing modulo scheduling immediately before the first scheduling pass. This pass looks at innermost loops and reorders their instructions by overlapping different iterations.

Perform more aggressive SMS-based modulo scheduling with register moves allowed. By setting this flag certain anti-dependences edges are deleted, which triggers the generation of reg-moves based on the life-range analysis. This option is effective only with enabled.

Disable the optimization pass that scans for opportunities to use “decrement and branch” instructions on a count register instead of instruction sequences that decrement a register, compare it against zero, and then branch based upon the result. This option is only meaningful on architectures that support such instructions, which include x86, PowerPC, IA-64 and S/390. Note that the option doesn’t remove the decrement and branch instructions from the generated instruction stream introduced by other optimization passes.

The default is at and higher, except for .

Do not put function addresses in registers; make each instruction that calls a constant function contain the function’s address explicitly.

This option results in less efficient code, but some strange hacks that alter the assembler output may be confused by the optimizations performed when this option is not used.

The default is

If the target supports a BSS section, GCC by default puts variables that are initialized to zero into BSS. This can save space in the resulting code.

This option turns off this behavior because some programs explicitly rely on variables going to the data section—e.g., so that the resulting executable can find the beginning of that section and/or make assumptions based on that.

The default is .

Perform optimizations that check to see if a jump branches to a location where another comparison subsumed by the first is found. If so, the first branch is redirected to either the destination of the second branch or a point immediately following it, depending on whether the condition is known to be true or false.

Enabled at levels , , , .

When using a type that occupies multiple registers, such as on a 32-bit system, split the registers apart and allocate them independently. This normally generates better code for those types, but may make debugging more difficult.

Enabled at levels , , , .

Fully split wide types early, instead of very late. This option has no effect unless is turned on.

This is the default on some targets.

In common subexpression elimination (CSE), scan through jump instructions when the target of the jump is not reached by any other path. For example, when CSE encounters an statement with an clause, CSE follows the jump when the condition tested is false.

Enabled at levels , , .

This is similar to , but causes CSE to follow jumps that conditionally skip over blocks. When CSE encounters a simple statement with no else clause, causes CSE to follow the jump around the body of the .

Enabled at levels , , .

Re-run common subexpression elimination after loop optimizations are performed.

Enabled at levels , , .

Perform a global common subexpression elimination pass. This pass also performs global constant and copy propagation.

Note: When compiling a program using computed gotos, a GCC extension, you may get better run-time performance if you disable the global common subexpression elimination pass by adding to the command line.

Enabled at levels , , .

When is enabled, global common subexpression elimination attempts to move loads that are only killed by stores into themselves. This allows a loop containing a load/store sequence to be changed to a load outside the loop, and a copy/store within the loop.

Enabled by default when is enabled.

When is enabled, a store motion pass is run after global common subexpression elimination. This pass attempts to move stores out of loops. When used in conjunction with , loops containing a load/store sequence can be changed to a load before the loop and a store after the loop.

Not enabled at any optimization level.

When is enabled, the global common subexpression elimination pass eliminates redundant loads that come after stores to the same memory location (both partial and full redundancies).

Not enabled at any optimization level.

When is enabled, a redundant load elimination pass is performed after reload. The purpose of this pass is to clean up redundant spilling.

Enabled by , and .

This option tells the loop optimizer to use language constraints to derive bounds for the number of iterations of a loop. This assumes that loop code does not invoke undefined behavior by for example causing signed integer overflows or out-of-bound array accesses. The bounds for the number of iterations of a loop are used to guide loop unrolling and peeling and loop exit test optimizations. This option is enabled by default.

This option tells the compiler that variables declared in common blocks (e.g. Fortran) may later be overridden with longer trailing arrays. This prevents certain optimizations that depend on knowing the array bounds.

Perform cross-jumping transformation. This transformation unifies equivalent code and saves code size. The resulting code may or may not perform better than without cross-jumping.

Enabled at levels , , .

Combine increments or decrements of addresses with memory accesses. This pass is always skipped on architectures that do not have instructions to support this. Enabled by default at and higher on architectures that support this.

Perform dead code elimination (DCE) on RTL. Enabled by default at and higher.

Perform dead store elimination (DSE) on RTL. Enabled by default at and higher.

Attempt to transform conditional jumps into branch-less equivalents. This includes use of conditional moves, min, max, set flags and abs instructions, and some tricks doable by standard arithmetics. The use of conditional execution on chips where it is available is controlled by .

Enabled at levels , , , , but not with .

Use conditional execution (where available) to transform conditional jumps into branch-less equivalents.

Enabled at levels , , , , but not with .

The C++ ABI requires multiple entry points for constructors and destructors: one for a base subobject, one for a complete object, and one for a virtual destructor that calls operator delete afterwards. For a hierarchy with virtual bases, the base and complete variants are clones, which means two copies of the function. With this option, the base and complete variants are changed to be thunks that call a common implementation.

Enabled by .

Assume that programs cannot safely dereference null pointers, and that no code or data element resides at address zero. This option enables simple constant folding optimizations at all optimization levels. In addition, other optimization passes in GCC use this flag to control global dataflow analyses that eliminate useless checks for null pointers; these assume that a memory access to address zero always results in a trap, so that if a pointer is checked after it has already been dereferenced, it cannot be null.

Note however that in some environments this assumption is not true. Use to disable this optimization for programs that depend on that behavior.

This option is enabled by default on most targets. On Nios II ELF, it defaults to off. On AVR, CR16, and MSP430, this option is completely disabled.

Passes that use the dataflow information are enabled independently at different optimization levels.

Attempt to convert calls to virtual functions to direct calls. This is done both within a procedure and interprocedurally as part of indirect inlining () and interprocedural constant propagation (). Enabled at levels , , .

Attempt to convert calls to virtual functions to speculative direct calls. Based on the analysis of the type inheritance graph, determine for a given call the set of likely targets. If the set is small, preferably of size 1, change the call into a conditional deciding between direct and indirect calls. The speculative calls enable more optimizations, such as inlining. When they seem useless after further optimization, they are converted back into original form.

Stream extra information needed for aggressive devirtualization when running the link-time optimizer in local transformation mode. This option enables more devirtualization but significantly increases the size of streamed data. For this reason it is disabled by default.

Perform a number of minor optimizations that are relatively expensive.

Enabled at levels , , .

Attempt to remove redundant extension instructions. This is especially helpful for the x86-64 architecture, which implicitly zero-extends in 64-bit registers after writing to their lower 32-bit half.

Enabled for Alpha, AArch64 and x86 at levels , , .

In C++ the value of an object is only affected by changes within its lifetime: when the constructor begins, the object has an indeterminate value, and any changes during the lifetime of the object are dead when the object is destroyed. Normally dead store elimination will take advantage of this; if your code relies on the value of the object storage persisting beyond the lifetime of the object, you can use this flag to disable this optimization. To preserve stores before the constructor starts (e.g. because your operator new clears the object storage) but still treat the object as dead after the destructor, you can use . The default behavior can be explicitly selected with . is equivalent to .

Attempt to decrease register pressure through register live range shrinkage. This is helpful for fast processors with small or moderate size register sets.

Use the specified coloring algorithm for the integrated register allocator. The argument can be ‘’, which specifies Chow’s priority coloring, or ‘’, which specifies Chaitin-Briggs coloring. Chaitin-Briggs coloring is not implemented for all architectures, but for those targets that do support it, it is the default because it generates better code.

Use specified regions for the integrated register allocator. The argument should be one of the following:

‘’

Use all loops as register allocation regions. This can give the best results for machines with a small and/or irregular register set.

‘’

Use all loops except for loops with small register pressure as the regions. This value usually gives the best results in most cases and for most architectures, and is enabled by default when compiling with optimization for speed (, , …).

‘’

Use all functions as a single region. This typically results in the smallest code size, and is enabled by default for or .

Use IRA to evaluate register pressure in the code hoisting pass for decisions to hoist expressions. This option usually results in smaller code, but it can slow the compiler down.

This option is enabled at level for all targets.

Use IRA to evaluate register pressure in loops for decisions to move loop invariants. This option usually results in generation of faster and smaller code on machines with large register files (>= 32 registers), but it can slow the compiler down.

This option is enabled at level for some targets.

Disable sharing of stack slots used for saving call-used hard registers living through a call. Each hard register gets a separate stack slot, and as a result function stack frames are larger.

Disable sharing of stack slots allocated for pseudo-registers. Each pseudo-register that does not get a hard register gets a separate stack slot, and as a result function stack frames are larger.

Enable CFG-sensitive rematerialization in LRA. Instead of loading values of spilled pseudos, LRA tries to rematerialize (recalculate) values if it is profitable.

Enabled at levels , , .

If supported for the target machine, attempt to reorder instructions to exploit instruction slots available after delayed branch instructions.

Enabled at levels , , , , but not at .

If supported for the target machine, attempt to reorder instructions to eliminate execution stalls due to required data being unavailable. This helps machines that have slow floating point or memory load instructions by allowing other instructions to be issued until the result of the load or floating-point instruction is required.

Enabled at levels , .

Similar to , but requests an additional pass of instruction scheduling after register allocation has been done. This is especially useful on machines with a relatively small number of registers and where memory load instructions take more than one cycle.

Enabled at levels , , .

Disable instruction scheduling across basic blocks, which is normally enabled when scheduling before register allocation, i.e. with or at or higher.

Disable speculative motion of non-load instructions, which is normally enabled when scheduling before register allocation, i.e. with or at or higher.

Enable register pressure sensitive insn scheduling before register allocation. This only makes sense when scheduling before register allocation is enabled, i.e. with or at or higher. Usage of this option can improve the generated code and decrease its size by preventing register pressure increase above the number of available hard registers and subsequent spills in register allocation.

Allow speculative motion of some load instructions. This only makes sense when scheduling before register allocation, i.e. with or at or higher.

Allow speculative motion of more load instructions. This only makes sense when scheduling before register allocation, i.e. with or at or higher.

Define how many insns (if any) can be moved prematurely from the queue of stalled insns into the ready list during the second scheduling pass. means that no insns are moved prematurely, means there is no limit on how many queued insns can be moved prematurely. without a value is equivalent to .

Define how many insn groups (cycles) are examined for a dependency on a stalled insn that is a candidate for premature removal from the queue of stalled insns. This has an effect only during the second scheduling pass, and only if is used. is equivalent to . without a value is equivalent to .

When scheduling after register allocation, use superblock scheduling. This allows motion across basic block boundaries, resulting in faster schedules. This option is experimental, as not all machine descriptions used by GCC model the CPU closely enough to avoid unreliable results from the algorithm.

This only makes sense when scheduling after register allocation, i.e. with or at or higher.

Enable the group heuristic in the scheduler. This heuristic favors the instruction that belongs to a schedule group. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the critical-path heuristic in the scheduler. This heuristic favors instructions on the critical path. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the speculative instruction heuristic in the scheduler. This heuristic favors speculative instructions with greater dependency weakness. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the rank heuristic in the scheduler. This heuristic favors the instruction belonging to a basic block with greater size or frequency. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the last-instruction heuristic in the scheduler. This heuristic favors the instruction that is less dependent on the last instruction scheduled. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Enable the dependent-count heuristic in the scheduler. This heuristic favors the instruction that has more instructions depending on it. This is enabled by default when scheduling is enabled, i.e. with or or at or higher.

Modulo scheduling is performed before traditional scheduling. If a loop is modulo scheduled, later scheduling passes may change its schedule. Use this option to control that behavior.

Schedule instructions using selective scheduling algorithm. Selective scheduling runs instead of the first scheduler pass.

Schedule instructions using selective scheduling algorithm. Selective scheduling runs instead of the second scheduler pass.

Enable software pipelining of innermost loops during selective scheduling. This option has no effect unless one of or is turned on.

When pipelining loops during selective scheduling, also pipeline outer loops. This option has no effect unless is turned on.

Some object formats, like ELF, allow interposing of symbols by the dynamic linker. This means that for symbols exported from the DSO, the compiler cannot perform interprocedural propagation, inlining and other optimizations in anticipation that the function or variable in question may change. While this feature is useful, for example, to rewrite memory allocation functions by a debugging implementation, it is expensive in the terms of code quality. With the compiler assumes that if interposition happens for functions the overwriting function will have precisely the same semantics (and side effects). Similarly if interposition happens for variables, the constructor of the variable will be the same. The flag has no effect for functions explicitly declared inline (where it is never allowed for interposition to change semantics) and for symbols explicitly declared weak.

Emit function prologues only before parts of the function that need it, rather than at the top of the function. This flag is enabled by default at and higher.

Shrink-wrap separate parts of the prologue and epilogue separately, so that those parts are only executed when needed. This option is on by default, but has no effect unless is also turned on and the target supports this.

Enable allocation of values to registers that are clobbered by function calls, by emitting extra instructions to save and restore the registers around such calls. Such allocation is done only when it seems to result in better code.

This option is always enabled by default on certain machines, usually those which have no call-preserved registers to use instead.

Enabled at levels , , .

Tracks stack adjustments (pushes and pops) and stack memory references and then tries to find ways to combine them.

Enabled by default at and higher.

Use caller save registers for allocation if those registers are not used by any called function. In that case it is not necessary to save and restore them around calls. This is only possible if called functions are part of same compilation unit as current function and they are compiled before it.

Enabled at levels , , , however the option is disabled if generated code will be instrumented for profiling (, or ) or if callee’s register usage cannot be known exactly (this happens on targets that do not expose prologues and epilogues in RTL).

Attempt to minimize stack usage. The compiler attempts to use less stack space, even if that makes the program slower. This option implies setting the parameter to 100 and the parameter to 400.

Perform reassociation on trees. This flag is enabled by default at and higher.

Perform code hoisting. Code hoisting tries to move the evaluation of expressions executed on all paths to the function exit as early as possible. This is especially useful as a code size optimization, but it often helps for code speed as well. This flag is enabled by default at and higher.

Perform partial redundancy elimination (PRE) on trees. This flag is enabled by default at and .

Make partial redundancy elimination (PRE) more aggressive. This flag is enabled by default at .

Perform forward propagation on trees. This flag is enabled by default at and higher.

Perform full redundancy elimination (FRE) on trees. The difference between FRE and PRE is that FRE only considers expressions that are computed on all paths leading to the redundant computation. This analysis is faster than PRE, though it exposes fewer redundancies. This flag is enabled by default at and higher.

Perform hoisting of loads from conditional pointers on trees. This pass is enabled by default at and higher.

Speculatively hoist loads from both branches of an if-then-else if the loads are from adjacent locations in the same structure and the target architecture has a conditional move instruction. This flag is enabled by default at and higher.

Perform copy propagation on trees. This pass eliminates unnecessary copy operations. This flag is enabled by default at and higher.

Discover which functions are pure or constant. Enabled by default at and higher.

Discover which static variables do not escape the compilation unit. Enabled by default at and higher.

Discover read-only, write-only and non-addressable static variables. Enabled by default at and higher.

Reduce stack alignment on call sites if possible. Enabled by default.

Perform interprocedural pointer analysis and interprocedural modification and reference analysis. This option can cause excessive memory and compile-time usage on large compilation units. It is not enabled by default at any optimization level.

Perform interprocedural profile propagation. The functions called only from cold functions are marked as cold. Also functions executed once (such as , , static constructors or destructors) are identified. Cold functions and loop less parts of functions executed once are then optimized for size. Enabled by default at and higher.

Perform interprocedural mod/ref analysis. This optimization analyzes the side effects of functions (memory locations that are modified or referenced) and enables better optimization across the function call boundary. This flag is enabled by default at and higher.

Perform interprocedural constant propagation. This optimization analyzes the program to determine when values passed to functions are constants and then optimizes accordingly. This optimization can substantially increase performance if the application has constants passed to functions. This flag is enabled by default at , and . It is also enabled by and .

Perform function cloning to make interprocedural constant propagation stronger. When enabled, interprocedural constant propagation performs function cloning when externally visible function can be called with constant arguments. Because this optimization can create multiple copies of functions, it may significantly increase code size (see ). This flag is enabled by default at . It is also enabled by and .

When enabled, perform interprocedural bitwise constant propagation. This flag is enabled by default at and by and . It requires that is enabled.

When enabled, perform interprocedural propagation of value ranges. This flag is enabled by default at . It requires that is enabled.

Perform Identical Code Folding for functions and read-only variables. The optimization reduces code size and may disturb unwind stacks by replacing a function by equivalent one with a different name. The optimization works more effectively with link-time optimization enabled.

Although the behavior is similar to the Gold Linker’s ICF optimization, GCC ICF works on different levels and thus the optimizations are not same - there are equivalences that are found only by GCC and equivalences found only by Gold.

This flag is enabled by default at and .

Control GCC’s optimizations to produce output suitable for live-patching.

If the compiler’s optimization uses a function’s body or information extracted from its body to optimize/change another function, the latter is called an impacted function of the former. If a function is patched, its impacted functions should be patched too.

The impacted functions are determined by the compiler’s interprocedural optimizations. For example, a caller is impacted when inlining a function into its caller, cloning a function and changing its caller to call this new clone, or extracting a function’s pureness/constness information to optimize its direct or indirect callers, etc.

Usually, the more IPA optimizations enabled, the larger the number of impacted functions for each function. In order to control the number of impacted functions and more easily compute the list of impacted function, IPA optimizations can be partially enabled at two different levels.

The argument should be one of the following:

‘’

Only enable inlining and cloning optimizations, which includes inlining, cloning, interprocedural scalar replacement of aggregates and partial inlining. As a result, when patching a function, all its callers and its clones’ callers are impacted, therefore need to be patched as well.

disables the following optimization flags:

-fwhole-program -fipa-pta -fipa-reference -fipa-ra -fipa-icf -fipa-icf-functions -fipa-icf-variables -fipa-bit-cp -fipa-vrp -fipa-pure-const -fipa-reference-addressable -fipa-stack-alignment -fipa-modref
‘’

Only enable inlining of static functions. As a result, when patching a static function, all its callers are impacted and so need to be patched as well.

In addition to all the flags that disables, disables the following additional optimization flags:

-fipa-cp-clone -fipa-sra -fpartial-inlining -fipa-cp

When is specified without any value, the default value is .

This flag is disabled by default.

Note that is not supported with link-time optimization ().

Detect paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behavior into a trap. This flag is enabled by default at and higher and depends on also being enabled.

Detect paths that trigger erroneous or undefined behavior due to a null value being used in a way forbidden by a or attribute. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behavior into a trap. This is not currently enabled, but may be enabled by in the future.

Perform forward store motion on trees. This flag is enabled by default at and higher.

Perform sparse conditional bit constant propagation on trees and propagate pointer alignment information. This pass only operates on local scalar variables and is enabled by default at and higher, except for . It requires that is enabled.

Perform sparse conditional constant propagation (CCP) on trees. This pass only operates on local scalar variables and is enabled by default at and higher.

Propagate information about uses of a value up the definition chain in order to simplify the definitions. For example, this pass strips sign operations if the sign of a value never matters. The flag is enabled by default at and higher.

Perform pattern matching on SSA PHI nodes to optimize conditional code. This pass is enabled by default at and higher, except for .

Perform conversion of simple initializations in a switch to initializations from a scalar array. This flag is enabled by default at and higher.

Look for identical code sequences. When found, replace one with a jump to the other. This optimization is known as tail merging or cross jumping. This flag is enabled by default at and higher. The compilation time in this pass can be limited using parameter and parameter.

Perform dead code elimination (DCE) on trees. This flag is enabled by default at and higher.

Perform conditional dead code elimination (DCE) for calls to built-in functions that may set but are otherwise free of side effects. This flag is enabled by default at and higher if is not also specified.

Assume that a loop with an exit will eventually take the exit and not loop indefinitely. This allows the compiler to remove loops that otherwise have no side-effects, not considering eventual endless looping as such.

This option is enabled by default at for C++ with -std=c++11 or higher.

Perform a variety of simple scalar cleanups (constant/copy propagation, redundancy elimination, range propagation and expression simplification) based on a dominator tree traversal. This also performs jump threading (to reduce jumps to jumps). This flag is enabled by default at and higher.

Perform dead store elimination (DSE) on trees. A dead store is a store into a memory location that is later overwritten by another store without any intervening loads. In this case the earlier store can be deleted. This flag is enabled by default at and higher.

Perform loop header copying on trees. This is beneficial since it increases effectiveness of code motion optimizations. It also saves one jump. This flag is enabled by default at and higher. It is not enabled for , since it usually increases code size.

Perform loop optimizations on trees. This flag is enabled by default at and higher.

Perform loop nest optimizations. Same as . To use this code transformation, GCC has to be configured with to enable the Graphite loop transformation infrastructure.

Enable the identity transformation for graphite. For every SCoP we generate the polyhedral representation and transform it back to gimple. Using we can check the costs or benefits of the GIMPLE -> GRAPHITE -> GIMPLE transformation. Some minimal optimizations are also performed by the code generator isl, like index splitting and dead code elimination in loops.

Enable the isl based loop nest optimizer. This is a generic loop nest optimizer based on the Pluto optimization algorithms. It calculates a loop structure optimized for data-locality and parallelism. This option is experimental.

Use the Graphite data dependence analysis to identify loops that can be parallelized. Parallelize all the loops that can be analyzed to not contain loop carried dependences without checking that it is profitable to parallelize the loops.

While transforming the program out of the SSA representation, attempt to reduce copying by coalescing versions of different user-defined variables, instead of just compiler temporaries. This may severely limit the ability to debug an optimized program compiled with . In the negated form, this flag prevents SSA coalescing of user variables. This option is enabled by default if optimization is enabled, and it does very little otherwise.

Attempt to transform conditional jumps in the innermost loops to branch-less equivalents. The intent is to remove control-flow from the innermost loops in order to improve the ability of the vectorization pass to handle these loops. This is enabled by default if vectorization is enabled.

Perform loop distribution. This flag can improve cache performance on big loop bodies and allow further loop optimizations, like parallelization or vectorization, to take place. For example, the loop

DO I = 1, N A(I) = B(I) + C D(I) = E(I) * F ENDDO

is transformed to

DO I = 1, N A(I) = B(I) + C ENDDO DO I = 1, N D(I) = E(I) * F ENDDO

This flag is enabled by default at . It is also enabled by and .

Perform loop distribution of patterns that can be code generated with calls to a library. This flag is enabled by default at and higher, and by and .

This pass distributes the initialization loops and generates a call to memset zero. For example, the loop

DO I = 1, N A(I) = 0 B(I) = A(I) + I ENDDO

is transformed to

DO I = 1, N A(I) = 0 ENDDO DO I = 1, N B(I) = A(I) + I ENDDO

and the initialization loop is transformed into a call to memset zero. This flag is enabled by default at . It is also enabled by and .

Perform loop interchange outside of graphite. This flag can improve cache performance on loop nest and allow further loop optimizations, like vectorization, to take place. For example, the loop

for (int i = 0; i < N; i++) for (int j = 0; j < N; j++) for (int k = 0; k < N; k++) c[i][j] = c[i][j] + a[i][k]*b[k][j];

is transformed to

for (int i = 0; i < N; i++) for (int k = 0; k < N; k++) for (int j = 0; j < N; j++) c[i][j] = c[i][j] + a[i][k]*b[k][j];

This flag is enabled by default at . It is also enabled by and .

Apply unroll and jam transformations on feasible loops. In a loop nest this unrolls the outer loop by some factor and fuses the resulting multiple inner loops. This flag is enabled by default at . It is also enabled by and .

Perform loop invariant motion on trees. This pass moves only invariants that are hard to handle at RTL level (function calls, operations that expand to nontrivial sequences of insns). With it also moves operands of conditions that are invariant out of the loop, so that we can use just trivial invariantness analysis in loop unswitching. The pass also includes store motion.

Create a canonical counter for number of iterations in loops for which determining number of iterations requires complicated analysis. Later optimizations then may determine the number easily. Useful especially in connection with unrolling.

Perform final value replacement. If a variable is modified in a loop in such a way that its value when exiting the loop can be determined using only its initial value and the number of loop iterations, replace uses of the final value by such a computation, provided it is sufficiently cheap. This reduces data dependencies and may allow further simplifications. Enabled by default at and higher.

Perform induction variable optimizations (strength reduction, induction variable merging and induction variable elimination) on trees.

Parallelize loops, i.e., split their iteration space to run in n threads. This is only possible for loops whose iterations are independent and can be arbitrarily reordered. The optimization is only profitable on multiprocessor machines, for loops that are CPU-intensive, rather than constrained e.g. by memory bandwidth. This option implies , and thus is only supported on targets that have support for .

Perform function-local points-to analysis on trees. This flag is enabled by default at and higher, except for .

Perform scalar replacement of aggregates. This pass replaces structure references with scalars to prevent committing structures to memory too early. This flag is enabled by default at and higher, except for .

Perform merging of narrow stores to consecutive memory addresses. This pass merges contiguous stores of immediate values narrower than a word into fewer wider stores to reduce the number of instructions. This is enabled by default at and higher as well as .

Perform temporary expression replacement during the SSA->normal phase. Single use/single def temporaries are replaced at their use location with their defining expression. This results in non-GIMPLE code, but gives the expanders much more complex trees to work on resulting in better RTL generation. This is enabled by default at and higher.

Perform straight-line strength reduction on trees. This recognizes related expressions involving multiplications and replaces them by less expensive calculations when possible. This is enabled by default at and higher.

Perform vectorization on trees. This flag enables and if not explicitly specified.

Perform loop vectorization on trees. This flag is enabled by default at and by , , and .

Perform basic block vectorization on trees. This flag is enabled by default at and by , , and .

Initialize automatic variables with either a pattern or with zeroes to increase the security and predictability of a program by preventing uninitialized memory disclosure and use. GCC still considers an automatic variable that doesn’t have an explicit initializer as uninitialized, -Wuninitialized will still report warning messages on such automatic variables. With this option, GCC will also initialize any padding of automatic variables that have structure or union types to zeroes.

The three values of are:

  • ‘’ doesn’t initialize any automatic variables. This is C and C++’s default.
  • ‘’ Initialize automatic variables with values which will likely transform logic bugs into crashes down the line, are easily recognized in a crash dump and without being values that programmers can rely on for useful program semantics. The current value is byte-repeatable pattern with byte "0xFE". The values used for pattern initialization might be changed in the future.
  • ‘’ Initialize automatic variables with zeroes.

The default is ‘’.

You can control this behavior for a specific variable by using the variable attribute (see Variable Attributes).

Alter the cost model used for vectorization. The argument should be one of ‘’, ‘’, ‘’ or ‘’. With the ‘’ model the vectorized code-path is assumed to be profitable while with the ‘’ model a runtime check guards the vectorized code-path to enable it only for iteration counts that will likely execute faster than when executing the original scalar loop. The ‘’ model disables vectorization of loops where doing so would be cost prohibitive for example due to required runtime checks for data dependence or alignment but otherwise is equal to the ‘’ model. The ‘’ model only allows vectorization if the vector code would entirely replace the scalar code that is being vectorized. For example, if each iteration of a vectorized loop would only be able to handle exactly four iterations of the scalar loop, the ‘’ model would only allow vectorization if the scalar iteration count is known to be a multiple of four.

The default cost model depends on other optimization flags and is either ‘’ or ‘’.

Alter the cost model used for vectorization of loops marked with the OpenMP simd directive. The argument should be one of ‘’, ‘’, ‘’. All values of have the same meaning as described in and by default a cost model defined with is used.

Perform Value Range Propagation on trees. This is similar to the constant propagation pass, but instead of values, ranges of values are propagated. This allows the optimizers to remove unnecessary range checks like array bound checks and null pointer checks. This is enabled by default at and higher. Null pointer check elimination is only done if is enabled.

Split paths leading to loop backedges. This can improve dead code elimination and common subexpression elimination. This is enabled by default at and above.

Enables expression of values of induction variables in later iterations of the unrolled loop using the value in the first iteration. This breaks long dependency chains, thus improving efficiency of the scheduling passes.

A combination of and CSE is often sufficient to obtain the same effect. However, that is not reliable in cases where the loop body is more complicated than a single basic block. It also does not work at all on some architectures due to restrictions in the CSE pass.

This optimization is enabled by default.

With this option, the compiler creates multiple copies of some local variables when unrolling a loop, which can result in superior code.

This optimization is enabled by default for PowerPC targets, but disabled by default otherwise.

Inline parts of functions. This option has any effect only when inlining itself is turned on by the or options.

Enabled at levels , , .

Perform predictive commoning optimization, i.e., reusing computations (especially memory loads and stores) performed in previous iterations of loops.

This option is enabled at level . It is also enabled by and .

If supported by the target machine, generate instructions to prefetch memory to improve the performance of loops that access large arrays.

This option may generate better or worse code; results are highly dependent on the structure of loops within the source code.

Disabled at level .

Do not substitute constants for known return value of formatted output functions such as , , , and (but not of ). This transformation allows GCC to optimize or even eliminate branches based on the known return value of these functions called with arguments that are either constant, or whose values are known to be in a range that makes determining the exact return value possible. For example, when is in effect, both the branch and the body of the statement (but not the call to ) can be optimized away when is a 32-bit or smaller integer because the return value is guaranteed to be at most 8.

char buf[9]; if (snprintf (buf, "%08x", i) >= sizeof buf) …

The option relies on other optimizations and yields best results with and above. It works in tandem with the and options. The option is enabled by default.

Disable any machine-specific peephole optimizations. The difference between and is in how they are implemented in the compiler; some targets use one, some use the other, a few use both.

is enabled by default. enabled at levels , , .

Do not guess branch probabilities using heuristics.

GCC uses heuristics to guess branch probabilities if they are not provided by profiling feedback (). These heuristics are based on the control flow graph. If some branch probabilities are specified by , then the heuristics are used to guess branch probabilities for the rest of the control flow graph, taking the info into account. The interactions between the heuristics and can be complex, and in some cases, it may be useful to disable the heuristics so that the effects of are easier to understand.

It is also possible to specify expected probability of the expression with built-in function.

The default is at levels , , , .

Reorder basic blocks in the compiled function in order to reduce number of taken branches and improve code locality.

Enabled at levels , , , .

Use the specified algorithm for basic block reordering. The argument can be ‘’, which does not increase code size (except sometimes due to secondary effects like alignment), or ‘’, the “software trace cache” algorithm, which tries to put all often executed code together, minimizing the number of branches executed by making extra copies of code.

The default is ‘’ at levels , , and ‘’ at levels , .

In addition to reordering basic blocks in the compiled function, in order to reduce number of taken branches, partitions hot and cold basic blocks into separate sections of the assembly and files, to improve paging and cache locality performance.

This optimization is automatically turned off in the presence of exception handling or unwind tables (on targets using setjump/longjump or target specific scheme), for linkonce sections, for functions with a user-defined section attribute and on any architecture that does not support named sections. When is used this option is not enabled by default (to avoid linker errors), but may be enabled explicitly (if using a working linker).

Enabled for x86 at levels , , .

Reorder functions in the object file in order to improve code locality. This is implemented by using special subsections for most frequently executed functions and for unlikely executed functions. Reordering is done by the linker so object file format must support named sections and linker must place them in a reasonable way.

This option isn’t effective unless you either provide profile feedback (see for details) or manually annotate functions with or attributes (see Common Function Attributes).

Enabled at levels , , .

Allow the compiler to assume the strictest aliasing rules applicable to the language being compiled. For C (and C++), this activates optimizations based on the type of expressions. In particular, an object of one type is assumed never to reside at the same address as an object of a different type, unless the types are almost the same. For example, an can alias an , but not a or a . A character type may alias any other type.

Pay special attention to code like this:

union a_union { int i; double d; }; int f() { union a_union t; t.d = 3.0; return t.i; }

The practice of reading from a different union member than the one most recently written to (called “type-punning”) is common. Even with , type-punning is allowed, provided the memory is accessed through the union type. So, the code above works as expected. See Structures unions enumerations and bit-fields implementation. However, this code might not:

int f() { union a_union t; int* ip; t.d = 3.0; ip = &t.i; return *ip; }

Similarly, access by taking the address, casting the resulting pointer and dereferencing the result has undefined behavior, even if the cast uses a union type, e.g.:

int f() { double d = 3.0; return ((union a_union *) &d)->i; }

The option is enabled at levels , , .

Align the start of functions to the next power-of-two greater than or equal to , skipping up to -1 bytes. This ensures that at least the first bytes of the function can be fetched by the CPU without crossing an -byte alignment boundary.

If is not specified, it defaults to .

Examples: aligns functions to the next 32-byte boundary, aligns to the next 32-byte boundary only if this can be done by skipping 23 bytes or less, aligns to the next 32-byte boundary only if this can be done by skipping 6 bytes or less.

The second pair of : values allows you to specify a secondary alignment: aligns to the next 64-byte boundary if this can be done by skipping 6 bytes or less, otherwise aligns to the next 32-byte boundary if this can be done by skipping 2 bytes or less. If is not specified, it defaults to .

Some assemblers only support this flag when is a power of two; in that case, it is rounded up.

and are equivalent and mean that functions are not aligned.

If is not specified or is zero, use a machine-dependent default. The maximum allowed option value is 65536.

Enabled at levels , .

If this option is enabled, the compiler tries to avoid unnecessarily overaligning functions. It attempts to instruct the assembler to align by the amount specified by , but not to skip more bytes than the size of the function.

Align all branch targets to a power-of-two boundary.

Parameters of this option are analogous to the option. and are equivalent and mean that labels are not aligned.

If or are applicable and are greater than this value, then their values are used instead.

If is not specified or is zero, use a machine-dependent default which is very likely to be ‘’, meaning no alignment. The maximum allowed option value is 65536.

Enabled at levels , .

Align loops to a power-of-two boundary. If the loops are executed many times, this makes up for any execution of the dummy padding instructions.

If is greater than this value, then its value is used instead.

Parameters of this option are analogous to the option. and are equivalent and mean that loops are not aligned. The maximum allowed option value is 65536.

If is not specified or is zero, use a machine-dependent default.

Enabled at levels , .

Align branch targets to a power-of-two boundary, for branch targets where the targets can only be reached by jumping. In this case, no dummy operations need be executed.

If is greater than this value, then its value is used instead.

Parameters of this option are analogous to the option. and are equivalent and mean that loops are not aligned.

If is not specified or is zero, use a machine-dependent default. The maximum allowed option value is 65536.

Enabled at levels , .

Do not remove unused C++ allocations in dead code elimination.

Allow the compiler to perform optimizations that may introduce new data races on stores, without proving that the variable cannot be concurrently accessed by other threads. Does not affect optimization of local data. It is safe to use this option if it is known that global data will not be accessed by multiple threads.

Examples of optimizations enabled by include hoisting or if-conversions that may cause a value that was already in memory to be re-written with that same value. Such re-writing is safe in a single threaded context but may be unsafe in a multi-threaded context. Note that on some processors, if-conversions may be required in order to enable vectorization.

Enabled at level .

This option is left for compatibility reasons. has no effect, while implies and .

Enabled by default.

Do not reorder top-level functions, variables, and statements. Output them in the same order that they appear in the input file. When this option is used, unreferenced static variables are not removed. This option is intended to support existing code that relies on a particular ordering. For new code, it is better to use attributes when possible.

is the default at and higher, and also at if is explicitly requested. Additionally implies .

Constructs webs as commonly used for register allocation purposes and assign each web individual pseudo register. This allows the register allocation pass to operate on pseudos directly, but also strengthens several other optimization passes, such as CSE, loop optimizer and trivial dead code remover. It can, however, make debugging impossible, since variables no longer stay in a “home register”.

Enabled by default with .

Assume that the current compilation unit represents the whole program being compiled. All public functions and variables with the exception of and those merged by attribute become static functions and in effect are optimized more aggressively by interprocedural optimizers.

This option should not be used in combination with . Instead relying on a linker plugin should provide safer and more precise information.

This option runs the standard link-time optimizer. When invoked with source code, it generates GIMPLE (one of GCC’s internal representations) and writes it to special ELF sections in the object file. When the object files are linked together, all the function bodies are read from these ELF sections and instantiated as if they had been part of the same translation unit.

To use the link-time optimizer, and optimization options should be specified at compile time and during the final link. It is recommended that you compile all the files participating in the same link with the same options and also specify those options at link time. For example:

gcc -c -O2 -flto foo.c gcc -c -O2 -flto bar.c gcc -o myprog -flto -O2 foo.o bar.o

The first two invocations to GCC save a bytecode representation of GIMPLE into special ELF sections inside and . The final invocation reads the GIMPLE bytecode from and , merges the two files into a single internal image, and compiles the result as usual. Since both and are merged into a single image, this causes all the interprocedural analyses and optimizations in GCC to work across the two files as if they were a single one. This means, for example, that the inliner is able to inline functions in into functions in and vice-versa.

Another (simpler) way to enable link-time optimization is:

gcc -o myprog -flto -O2 foo.c bar.c

The above generates bytecode for and , merges them together into a single GIMPLE representation and optimizes them as usual to produce .

The important thing to keep in mind is that to enable link-time optimizations you need to use the GCC driver to perform the link step. GCC automatically performs link-time optimization if any of the objects involved were compiled with the command-line option. You can always override the automatic decision to do link-time optimization by passing to the link command.

To make whole program optimization effective, it is necessary to make certain whole program assumptions. The compiler needs to know what functions and variables can be accessed by libraries and runtime outside of the link-time optimized unit. When supported by the linker, the linker plugin (see ) passes information to the compiler about used and externally visible symbols. When the linker plugin is not available, should be used to allow the compiler to make these assumptions, which leads to more aggressive optimization decisions.

When a file is compiled with without , the generated object file is larger than a regular object file because it contains GIMPLE bytecodes and the usual final code (see ). This means that object files with LTO information can be linked as normal object files; if is passed to the linker, no interprocedural optimizations are applied. Note that when is enabled the compile stage is faster but you cannot perform a regular, non-LTO link on them.

When producing the final binary, GCC only applies link-time optimizations to those files that contain bytecode. Therefore, you can mix and match object files and libraries with GIMPLE bytecodes and final object code. GCC automatically selects which files to optimize in LTO mode and which files to link without further processing.

Generally, options specified at link time override those specified at compile time, although in some cases GCC attempts to infer link-time options from the settings used to compile the input files.

If you do not specify an optimization level option at link time, then GCC uses the highest optimization level used when compiling the object files. Note that it is generally ineffective to specify an optimization level option only at link time and not at compile time, for two reasons. First, compiling without optimization suppresses compiler passes that gather information needed for effective optimization at link time. Second, some early optimization passes can be performed only at compile time and not at link time.

There are some code generation flags preserved by GCC when generating bytecodes, as they need to be used during the final link. Currently, the following options and their settings are taken from the first object file that explicitly specifies them: , , , and all the target flags.

The following options , , and are combined based on the following scheme:

+ = + = + (no option) = (no option) + = + = + =

Certain ABI-changing flags are required to match in all compilation units, and trying to override this at link time with a conflicting value is ignored. This includes options such as and .

Other options such as , , , or are passed through to the link stage and merged conservatively for conflicting translation units. Specifically , and take precedence; and for example takes precedence over . You can override them at link time.

Diagnostic options such as are passed through to the link stage and their setting matches that of the compile-step at function granularity. Note that this matters only for diagnostics emitted during optimization. Note that code transforms such as inlining can lead to warnings being enabled or disabled for regions if code not consistent with the setting at compile time.

When you need to pass options to the assembler via or make sure to either compile such translation units with or consistently use the same assembler options on all translation units. You can alternatively also specify assembler options at LTO link time.

To enable debug info generation you need to supply at compile time. If any of the input files at link time were built with debug info generation enabled the link will enable debug info generation as well. Any elaborate debug info settings like the dwarf level need to be explicitly repeated at the linker command line and mixing different settings in different translation units is discouraged.

If LTO encounters objects with C linkage declared with incompatible types in separate translation units to be linked together (undefined behavior according to ISO C99 6.2.7), a non-fatal diagnostic may be issued. The behavior is still undefined at run time. Similar diagnostics may be raised for other languages.

Another feature of LTO is that it is possible to apply interprocedural optimizations on files written in different languages:

gcc -c -flto foo.c g++ -c -flto bar.cc gfortran -c -flto baz.f90 g++ -o myprog -flto -O3 foo.o bar.o baz.o -lgfortran

Notice that the final link is done with to get the C++ runtime libraries and is added to get the Fortran runtime libraries. In general, when mixing languages in LTO mode, you should use the same link command options as when mixing languages in a regular (non-LTO) compilation.

If object files containing GIMPLE bytecode are stored in a library archive, say , it is possible to extract and use them in an LTO link if you are using a linker with plugin support. To create static libraries suitable for LTO, use and instead of and ; to show the symbols of object files with GIMPLE bytecode, use . Those commands require that , and have been compiled with plugin support. At link time, use the flag to ensure that the library participates in the LTO optimization process:

gcc -o myprog -O2 -flto -fuse-linker-plugin a.o b.o -lfoo

With the linker plugin enabled, the linker extracts the needed GIMPLE files from and passes them on to the running GCC to make them part of the aggregated GIMPLE image to be optimized.

If you are not using a linker with plugin support and/or do not enable the linker plugin, then the objects inside are extracted and linked as usual, but they do not participate in the LTO optimization process. In order to make a static library suitable for both LTO optimization and usual linkage, compile its object files with .

Link-time optimizations do not require the presence of the whole program to operate. If the program does not require any symbols to be exported, it is possible to combine and to allow the interprocedural optimizers to use more aggressive assumptions which may lead to improved optimization opportunities. Use of is not needed when linker plugin is active (see ).

The current implementation of LTO makes no attempt to generate bytecode that is portable between different types of hosts. The bytecode files are versioned and there is a strict version check, so bytecode files generated in one version of GCC do not work with an older or newer version of GCC.

Link-time optimization does not work well with generation of debugging information on systems other than those using a combination of ELF and DWARF.

If you specify the optional , the optimization and code generation done at link time is executed in parallel using parallel jobs by utilizing an installed program. The environment variable may be used to override the program used.

You can also specify to use GNU make’s job server mode to determine the number of parallel jobs. This is useful when the Makefile calling GCC is already executing in parallel. You must prepend a ‘’ to the command recipe in the parent Makefile for this to work. This option likely only works if is GNU make. Even without the option value, GCC tries to automatically detect a running GNU make’s job server.

Use to use GNU make’s job server, if available, or otherwise fall back to autodetection of the number of CPU threads present in your system.

Specify the partitioning algorithm used by the link-time optimizer. The value is either ‘’ to specify a partitioning mirroring the original source files or ‘’ to specify partitioning into equally sized chunks (whenever possible) or ‘’ to create new partition for every symbol where possible. Specifying ‘’ as an algorithm disables partitioning and streaming completely. The default value is ‘’. While ‘’ can be used as an workaround for various code ordering issues, the ‘’ partitioning is intended for internal testing only. The value ‘’ specifies that exactly one partition should be used while the value ‘’ bypasses partitioning and executes the link-time optimization step directly from the WPA phase.

This option specifies the level of compression used for intermediate language written to LTO object files, and is only meaningful in conjunction with LTO mode (). GCC currently supports two LTO compression algorithms. For zstd, valid values are 0 (no compression) to 19 (maximum compression), while zlib supports values from 0 to 9. Values outside this range are clamped to either minimum or maximum of the supported values. If the option is not given, a default balanced compression setting is used.

Enables the use of a linker plugin during link-time optimization. This option relies on plugin support in the linker, which is available in gold or in GNU ld 2.21 or newer.

This option enables the extraction of object files with GIMPLE bytecode out of library archives. This improves the quality of optimization by exposing more code to the link-time optimizer. This information specifies what symbols can be accessed externally (by non-LTO object or during dynamic linking). Resulting code quality improvements on binaries (and shared libraries that use hidden visibility) are similar to . See for a description of the effect of this flag and how to use it.

This option is enabled by default when LTO support in GCC is enabled and GCC was configured for use with a linker supporting plugins (GNU ld 2.21 or newer or gold).

Fat LTO objects are object files that contain both the intermediate language and the object code. This makes them usable for both LTO linking and normal linking. This option is effective only when compiling with and is ignored at link time.

improves compilation time over plain LTO, but requires the complete toolchain to be aware of LTO. It requires a linker with linker plugin support for basic functionality. Additionally, , and need to support linker plugins to allow a full-featured build environment (capable of building static libraries etc). GCC provides the , , wrappers to pass the right options to these tools. With non fat LTO makefiles need to be modified to use them.

Note that modern binutils provide plugin auto-load mechanism. Installing the linker plugin into has the same effect as usage of the command wrappers (, and ).

The default is on targets with linker plugin support.

After register allocation and post-register allocation instruction splitting, identify arithmetic instructions that compute processor flags similar to a comparison operation based on that arithmetic. If possible, eliminate the explicit comparison operation.

This pass only applies to certain targets that cannot explicitly represent the comparison operation before register allocation is complete.

Enabled at levels , , , .

After register allocation and post-register allocation instruction splitting, perform a copy-propagation pass to try to reduce scheduling dependencies and occasionally eliminate the copy.

Enabled at levels , , , .

Profiles collected using an instrumented binary for multi-threaded programs may be inconsistent due to missed counter updates. When this option is specified, GCC uses heuristics to correct or smooth out such inconsistencies. By default, GCC emits an error message when an inconsistent profile is detected.

This option is enabled by .

With all portions of programs not executed during train run are optimized agressively for size rather than speed. In some cases it is not practical to train all possible hot paths in the program. (For example, program may contain functions specific for a given hardware and trianing may not cover all hardware configurations program is run on.) With profile feedback will be ignored for all functions not executed during the train run leading them to be optimized as if they were compiled without profile feedback. This leads to better performance when train run is not representative but also leads to significantly bigger code.

Enable profile feedback-directed optimizations, and the following optimizations, many of which are generally profitable only with profile feedback available:

-fbranch-probabilities -fprofile-values -funroll-loops -fpeel-loops -ftracer -fvpt -finline-functions -fipa-cp -fipa-cp-clone -fipa-bit-cp -fpredictive-commoning -fsplit-loops -funswitch-loops -fgcse-after-reload -ftree-loop-vectorize -ftree-slp-vectorize -fvect-cost-model=dynamic -ftree-loop-distribute-patterns -fprofile-reorder-functions

Before you can use this option, you must first generate profiling information. See Instrumentation Options, for information about the option.

By default, GCC emits an error message if the feedback profiles do not match the source code. This error can be turned into a warning by using . Note this may result in poorly optimized code. Additionally, by default, GCC also emits a warning message if the feedback profiles do not exist (see ).

If is specified, GCC looks at the to find the profile feedback data files. See .

Enable sampling-based feedback-directed optimizations, and the following optimizations, many of which are generally profitable only with profile feedback available:

-fbranch-probabilities -fprofile-values -funroll-loops -fpeel-loops -ftracer -fvpt -finline-functions -fipa-cp -fipa-cp-clone -fipa-bit-cp -fpredictive-commoning -fsplit-loops -funswitch-loops -fgcse-after-reload -ftree-loop-vectorize -ftree-slp-vectorize -fvect-cost-model=dynamic -ftree-loop-distribute-patterns -fprofile-correction

is the name of a file containing AutoFDO profile information. If omitted, it defaults to in the current directory.

Producing an AutoFDO profile data file requires running your program with the utility on a supported GNU/Linux target system. For more information, see https://perf.wiki.kernel.org/.

E.g.

perf record -e br_inst_retired:near_taken -b -o perf.data \ -- your_program

Then use the tool to convert the raw profile data to a format that can be used by GCC.  You must also supply the unstripped binary for your program to this tool. See https://github.com/google/autofdo.

E.g.

create_gcov --binary=your_program.unstripped --profile=perf.data \ --gcov=profile.afdo

The following options control compiler behavior regarding floating-point arithmetic. These options trade off between speed and correctness. All must be specifically enabled.

The following options control optimizations that may improve performance, but are not enabled by any options. This section includes experimental options that may produce broken code.

After running a program compiled with (see Instrumentation Options), you can compile it a second time using , to improve optimizations based on the number of times each branch was taken. When a program compiled with exits, it saves arc execution counts to a file called for each source file. The information in this data file is very dependent on the structure of the generated code, so you must use the same source code and the same optimization options for both compilations.

With , GCC puts a ‘’ note on each ‘’ and ‘’. These can be used to improve optimization. Currently, they are only used in one place: in , instead of guessing which path a branch is most likely to take, the ‘’ values are used to exactly determine which path is taken more often.

Enabled by and .

If combined with , it adds code so that some data about values of expressions in the program is gathered.

With , it reads back the data gathered from profiling values of expressions for usage in optimizations.

Enabled by , , and .

Function reordering based on profile instrumentation collects first time of execution of a function and orders these functions in ascending order.

Enabled with .

If combined with , this option instructs the compiler to add code to gather information about values of expressions.

With , it reads back the data gathered and actually performs the optimizations based on them. Currently the optimizations include specialization of division operations using the knowledge about the value of the denominator.

Enabled with and .

Attempt to avoid false dependencies in scheduled code by making use of registers left over after register allocation. This optimization most benefits processors with lots of registers. Depending on the debug information format adopted by the target, however, it can make debugging impossible, since variables no longer stay in a “home register”.

Enabled by default with .

Performs a target dependent pass over the instruction stream to schedule instructions of same type together because target machine can execute them more efficiently if they are adjacent to each other in the instruction flow.

Enabled at levels , , .

Perform tail duplication to enlarge superblock size. This transformation simplifies the control flow of the function allowing other optimizations to do a better job.

Enabled by and .

Unroll loops whose number of iterations can be determined at compile time or upon entry to the loop. implies , and . It also turns on complete loop peeling (i.e. complete removal of loops with a small constant number of iterations). This option makes code larger, and may or may not make it run faster.

Enabled by and .

Unroll all loops, even if their number of iterations is uncertain when the loop is entered. This usually makes programs run more slowly. implies the same options as .

Peels loops for which there is enough information that they do not roll much (from profile feedback or static analysis). It also turns on complete loop peeling (i.e. complete removal of loops with small constant number of iterations).

Enabled by , , and .

Enables the loop invariant motion pass in the RTL loop optimizer. Enabled at level and higher, except for .

Enables the loop store motion pass in the GIMPLE loop optimizer. This moves invariant stores to after the end of the loop in exchange for carrying the stored value in a register across the iteration. Note for this option to have an effect has to be enabled as well. Enabled at level and higher, except for .

Split a loop into two if it contains a condition that’s always true for one side of the iteration space and false for the other.

Enabled by and .

Move branches with loop invariant conditions out of the loop, with duplicates of the loop on both branches (modified according to result of the condition).

Enabled by and .

If a loop iterates over an array with a variable stride, create another version of the loop that assumes the stride is always one. For example:

for (int i = 0; i < n; ++i) x[i * stride] = …;

becomes:

if (stride == 1) for (int i = 0; i < n; ++i) x[i] = …; else for (int i = 0; i < n; ++i) x[i * stride] = …;

This is particularly useful for assumed-shape arrays in Fortran where (for example) it allows better vectorization assuming contiguous accesses. This flag is enabled by default at . It is also enabled by and .

Place each function or data item into its own section in the output file if the target supports arbitrary sections. The name of the function or the name of the data item determines the section’s name in the output file.

Use these options on systems where the linker can perform optimizations to improve locality of reference in the instruction space. Most systems using the ELF object format have linkers with such optimizations. On AIX, the linker rearranges sections (CSECTs) based on the call graph. The performance impact varies.

Together with a linker garbage collection (linker option) these options may lead to smaller statically-linked executables (after stripping).

On ELF/DWARF systems these options do not degenerate the quality of the debug information. There could be issues with other object files/debug info formats.

Only use these options when there are significant benefits from doing so. When you specify these options, the assembler and linker create larger object and executable files and are also slower. These options affect code generation. They prevent optimizations by the compiler and assembler using relative locations inside a translation unit since the locations are unknown until link time. An example of such an optimization is relaxing calls to short call instructions.

Optimize the prologue of variadic argument functions with respect to usage of those arguments.

Try to reduce the number of symbolic address calculations by using shared “anchor” symbols to address nearby objects. This transformation can help to reduce the number of GOT entries and GOT accesses on some targets.

For example, the implementation of the following function :

static int a, b, c; int foo (void) { return a + b + c; }

usually calculates the addresses of all three variables, but if you compile it with , it accesses the variables from a common anchor point instead. The effect is similar to the following pseudocode (which isn’t valid C):

int foo (void) { register int *xr = &x; return xr[&a - &x] + xr[&b - &x] + xr[&c - &x]; }

Not all targets support this option.

Zero call-used registers at function return to increase program security by either mitigating Return-Oriented Programming (ROP) attacks or preventing information leakage through registers.

The possible values of are the same as for the attribute (see Function Attributes). The default is ‘’.

You can control this behavior for a specific function by using the function attribute (see Function Attributes).

In some places, GCC uses various constants to control the amount of optimization that is done. For example, GCC does not inline functions that contain more than a certain number of instructions. You can control some of these constants on the command line using the option.

The names of specific parameters, and the meaning of the values, are tied to the internals of the compiler, and are subject to change without notice in future releases.

In order to get minimal, maximal and default value of a parameter, one can use options.

In each case, the is an integer. The following choices of are recognized for all targets:

When branch is predicted to be taken with probability lower than this threshold (in percent), then it is considered well predictable.

RTL if-conversion tries to remove conditional branches around a block and replace them with conditionally executed instructions. This parameter gives the maximum number of instructions in a block which should be considered for if-conversion. The compiler will also use other heuristics to decide whether if-conversion is likely to be profitable.

RTL if-conversion will try to remove conditional branches around a block and replace them with conditionally executed instructions. These parameters give the maximum permissible cost for the sequence that would be generated by if-conversion depending on whether the branch is statically determined to be predictable or not. The units for this parameter are the same as those for the GCC internal seq_cost metric. The compiler will try to provide a reasonable default for this parameter using the BRANCH_COST target macro.

The maximum number of incoming edges to consider for cross-jumping. The algorithm used by is O(N^2) in the number of edges incoming to each block. Increasing values mean more aggressive optimization, making the compilation time increase with probably small improvement in executable size.

The minimum number of instructions that must be matched at the end of two blocks before cross-jumping is performed on them. This value is ignored in the case where all instructions in the block being cross-jumped from are matched.

The maximum code size expansion factor when copying basic blocks instead of jumping. The expansion is relative to a jump instruction.

The maximum number of instructions to duplicate to a block that jumps to a computed goto. To avoid O(N^2) behavior in a number of passes, GCC factors computed gotos early in the compilation process, and unfactors them as late as possible. Only computed jumps at the end of a basic blocks with no more than max-goto-duplication-insns are unfactored.

The maximum number of instructions to consider when looking for an instruction to fill a delay slot. If more than this arbitrary number of instructions are searched, the time savings from filling the delay slot are minimal, so stop searching. Increasing values mean more aggressive optimization, making the compilation time increase with probably small improvement in execution time.

When trying to fill delay slots, the maximum number of instructions to consider when searching for a block with valid live register information. Increasing this arbitrarily chosen value means more aggressive optimization, increasing the compilation time. This parameter should be removed when the delay slot code is rewritten to maintain the control-flow graph.

The approximate maximum amount of memory in that can be allocated in order to perform the global common subexpression elimination optimization. If more memory than specified is required, the optimization is not done.

If the ratio of expression insertions to deletions is larger than this value for any expression, then RTL PRE inserts or removes the expression and thus leaves partially redundant computations in the instruction stream.

The maximum number of pending dependencies scheduling allows before flushing the current state and starting over. Large functions with few branches or calls can create excessively large lists which needlessly consume memory and resources.

The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop. Larger values can exponentially increase compilation time.

Several parameters control the tree inliner used in GCC. This number sets the maximum number of instructions (counted in GCC’s internal representation) in a single function that the tree inliner considers for inlining. This only affects functions declared inline and methods implemented in a class declaration (C++).

When you use (included in ), a lot of functions that would otherwise not be considered for inlining by the compiler are investigated. To those functions, a different (more restrictive) limit compared to functions declared inline can be applied ().

This is bound applied to calls which are considered relevant with .

This is bound applied to calls which are optimized for size. Small growth may be desirable to anticipate optimization oppurtunities exposed by inlining.

Number of instructions accounted by inliner for function overhead such as function prologue and epilogue.

Extra time accounted by inliner for function overhead such as time needed to execute function prologue and epilogue.

The scale (in percents) applied to , , when inline heuristics hints that inlining is very profitable (will enable later optimizations).

Same as and but applied to function thunks.

When estimated performance improvement of caller + callee runtime exceeds this threshold (in percent), the function can be inlined regardless of the limit on and .

The limit specifying really large functions. For functions larger than this limit after inlining, inlining is constrained by . This parameter is useful primarily to avoid extreme compilation time caused by non-linear algorithms used by the back end.

Specifies maximal growth of large function caused by inlining in percents. For example, parameter value 100 limits large function growth to 2.0 times the original size.

The limit specifying large translation unit. Growth caused by inlining of units larger than this limit is limited by . For small units this might be too tight. For example, consider a unit consisting of function A that is inline and B that just calls A three times. If B is small relative to A, the growth of unit is 300\% and yet such inlining is very sane. For very large units consisting of small inlineable functions, however, the overall unit growth limit is needed to avoid exponential explosion of code size. Thus for smaller units, the size is increased to before applying .

Maximum number of concurrently open C++ module files when lazy loading.

Specifies maximal overall growth of the compilation unit caused by inlining. For example, parameter value 20 limits unit growth to 1.2 times the original size. Cold functions (either marked cold via an attribute or by profile feedback) are not accounted into the unit size.

Specifies maximal overall growth of the compilation unit caused by interprocedural constant propagation. For example, parameter value 10 limits unit growth to 1.1 times the original size.

The size of translation unit that IPA-CP pass considers large.

The limit specifying large stack frames. While inlining the algorithm is trying to not grow past this limit too much.

Specifies maximal growth of large stack frames caused by inlining in percents. For example, parameter value 1000 limits large stack frame growth to 11 times the original size.

Specifies the maximum number of instructions an out-of-line copy of a self-recursive inline function can grow into by performing recursive inlining.

applies to functions declared inline. For functions not declared inline, recursive inlining happens only when (included in ) is enabled; applies instead.

Specifies the maximum recursion depth used for recursive inlining.

applies to functions declared inline. For functions not declared inline, recursive inlining happens only when (included in ) is enabled; applies instead.

Recursive inlining is profitable only for function having deep recursion in average and can hurt for function having little recursion depth by increasing the prologue size or complexity of function body to other optimizers.

When profile feedback is available (see ) the actual recursion depth can be guessed from the probability that function recurses via a given call expression. This parameter limits inlining only to call expressions whose probability exceeds the given threshold (in percents).

Specify growth that the early inliner can make. In effect it increases the amount of inlining for code having a large abstraction penalty.

Limit of iterations of the early inliner. This basically bounds the number of nested indirect calls the early inliner can resolve. Deeper chains are still handled by late inlining.

Probability (in percent) that C++ inline function with comdat visibility are shared across multiple compilation units.

Specifies the maximal number of base pointers, references and accesses stored for a single function by mod/ref analysis.

Specifies the maxmal number of tests alias oracle can perform to disambiguate memory locations using the mod/ref information. This parameter ought to be bigger than and .

Specifies the maximum depth of DFS walk used by modref escape analysis. Setting to 0 disables the analysis completely.

Specifies the maximum number of escape points tracked by modref per SSA-name.

Specifies the maximum number the access range is enlarged during modref dataflow analysis.

A parameter to control whether to use function internal id in profile database lookup. If the value is 0, the compiler uses an id that is based on function assembler name and filename, which makes old profile data more tolerant to source changes such as function reordering etc.

The minimum number of iterations under which loops are not vectorized when is used. The number of iterations after vectorization needs to be greater than the value specified by this option to allow vectorization.

Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations. This is currently supported only in the code hoisting pass. The bigger the ratio, the more aggressive code hoisting is with simple expressions, i.e., the expressions that have cost less than . Specifying 0 disables hoisting of simple expressions.

Cost, roughly measured as the cost of a single typical machine instruction, at which GCSE optimizations do not constrain the distance an expression can travel. This is currently supported only in the code hoisting pass. The lesser the cost, the more aggressive code hoisting is. Specifying 0 allows all expressions to travel unrestricted distances.

The depth of search in the dominator tree for expressions to hoist. This is used to avoid quadratic behavior in hoisting algorithm. The value of 0 does not limit on the search, but may slow down compilation of huge functions.

The maximum amount of similar bbs to compare a bb with. This is used to avoid quadratic behavior in tree tail merging.

The maximum amount of iterations of the pass over the function. This is used to limit compilation time in tree tail merging.

Allow the store merging pass to introduce unaligned stores if it is legal to do so.

The maximum number of stores to attempt to merge into wider stores in the store merging pass.

The maximum number of store chains to track at the same time in the attempt to merge them into wider stores in the store merging pass.

The maximum number of stores to track at the same time in the attemt to to merge them into wider stores in the store merging pass.

The maximum number of instructions that a loop may have to be unrolled. If a loop is unrolled, this parameter also determines how many times the loop code is unrolled.

The maximum number of instructions biased by probabilities of their execution that a loop may have to be unrolled. If a loop is unrolled, this parameter also determines how many times the loop code is unrolled.

The maximum number of unrollings of a single loop.

The maximum number of instructions that a loop may have to be peeled. If a loop is peeled, this parameter also determines how many times the loop code is peeled.

The maximum number of peelings of a single loop.

The maximum number of branches on the hot path through the peeled sequence.

The maximum number of insns of a completely peeled loop.

The maximum number of iterations of a loop to be suitable for complete peeling.

The maximum depth of a loop nest suitable for complete peeling.

The maximum number of insns of an unswitched loop.

The maximum number of branches unswitched in a single loop.

The minimum cost of an expensive expression in the loop invariant motion.

When FDO profile information is available, specifies minimum threshold for probability of semi-invariant condition statement to trigger loop split.

Bound on number of candidates for induction variables, below which all candidates are considered for each use in induction variable optimizations. If there are more candidates than this, only the most relevant ones are considered to avoid quadratic time complexity.

The induction variable optimizations give up on loops that contain more induction variable uses.

If the number of candidates in the set is smaller than this value, always try to remove unnecessary ivs from the set when adding a new one.

Average number of iterations of a loop.

Maximum size (in bytes) of objects tracked bytewise by dead store elimination. Larger values may result in larger compilation times.

Maximum number of queries into the alias oracle per store. Larger values result in larger compilation times and may result in more removed dead stores.

Bound on size of expressions used in the scalar evolutions analyzer. Large expressions slow the analyzer.

Bound on the complexity of the expressions in the scalar evolutions analyzer. Complex expressions slow the analyzer.

Maximum number of arguments in a PHI supported by TREE if conversion unless the loop is marked with simd pragma.

The maximum number of run-time checks that can be performed when doing loop versioning for alignment in the vectorizer.

The maximum number of run-time checks that can be performed when doing loop versioning for alias in the vectorizer.

The maximum number of loop peels to enhance access alignment for vectorizer. Value -1 means no limit.

The maximum number of iterations of a loop the brute-force algorithm for analysis of the number of iterations of the loop tries to evaluate.

The denominator n of fraction 1/n of the maximal execution count of a basic block in the entire program that a basic block needs to at least have in order to be considered hot. The default is 10000, which means that a basic block is considered hot if its execution count is greater than 1/10000 of the maximal execution count. 0 means that it is never considered hot. Used in non-LTO mode.

The number of most executed permilles, ranging from 0 to 1000, of the profiled execution of the entire program to which the execution count of a basic block must be part of in order to be considered hot. The default is 990, which means that a basic block is considered hot if its execution count contributes to the upper 990 permilles, or 99.0%, of the profiled execution of the entire program. 0 means that it is never considered hot. Used in LTO mode.

The denominator n of fraction 1/n of the execution frequency of the entry block of a function that a basic block of this function needs to at least have in order to be considered hot. The default is 1000, which means that a basic block is considered hot in a function if it is executed more frequently than 1/1000 of the frequency of the entry block of the function. 0 means that it is never considered hot.

The denominator n of fraction 1/n of the number of profiled runs of the entire program below which the execution count of a basic block must be in order for the basic block to be considered unlikely executed. The default is 20, which means that a basic block is considered unlikely executed if it is executed in fewer than 1/20, or 5%, of the runs of the program. 0 means that it is always considered unlikely executed.

The maximum number of loop iterations we predict statically. This is useful in cases where a function contains a single loop with known bound and another loop with unknown bound. The known number of iterations is predicted correctly, while the unknown number of iterations average to roughly 10. This means that the loop without bounds appears artificially cold relative to the other one.

Control the probability of the expression having the specified value. This parameter takes a percentage (i.e. 0 ... 100) as input.

The maximum length of a constant string for a builtin string cmp call eligible for inlining.

Select fraction of the maximal frequency of executions of a basic block in a function to align the basic block.

A loop expected to iterate at least the selected number of iterations is aligned.

This value is used to limit superblock formation once the given percentage of executed instructions is covered. This limits unnecessary code size expansion.

The parameter is used only when profile feedback is available. The real profiles (as opposed to statically estimated ones) are much less balanced allowing the threshold to be larger value.

Stop tail duplication once code growth has reached given percentage. This is a rather artificial limit, as most of the duplicates are eliminated later in cross jumping, so it may be set to much higher values than is the desired code growth.

Stop reverse growth when the reverse probability of best edge is less than this threshold (in percent).

Stop forward growth if the best edge has probability lower than this threshold.

Similarly to two parameters are provided. is used for compilation with profile feedback and compilation without. The value for compilation with profile feedback needs to be more conservative (higher) in order to make tracer effective.

Specify the size of the operating system provided stack guard as 2 raised to bytes. Higher values may reduce the number of explicit probes, but a value larger than the operating system provided guard will leave code vulnerable to stack clash style attacks.

Stack clash protection involves probing stack space as it is allocated. This param controls the maximum distance between probes into the stack as 2 raised to bytes. Higher values may reduce the number of explicit probes, but a value larger than the operating system provided guard will leave code vulnerable to stack clash style attacks.

The maximum number of basic blocks on path that CSE considers.

The maximum number of instructions CSE processes before flushing.

GCC uses a garbage collector to manage its own memory allocation. This parameter specifies the minimum percentage by which the garbage collector’s heap should be allowed to expand between collections. Tuning this may improve compilation speed; it has no effect on code generation.

The default is 30% + 70% * (RAM/1GB) with an upper bound of 100% when RAM >= 1GB. If is available, the notion of “RAM” is the smallest of actual RAM and or . If GCC is not able to calculate RAM on a particular platform, the lower bound of 30% is used. Setting this parameter and to zero causes a full collection to occur at every opportunity. This is extremely slow, but can be useful for debugging.

Minimum size of the garbage collector’s heap before it begins bothering to collect garbage. The first collection occurs after the heap expands by % beyond . Again, tuning this may improve compilation speed, and has no effect on code generation.

The default is the smaller of RAM/8, RLIMIT_RSS, or a limit that tries to ensure that RLIMIT_DATA or RLIMIT_AS are not exceeded, but with a lower bound of 4096 (four megabytes) and an upper bound of 131072 (128 megabytes). If GCC is not able to calculate RAM on a particular platform, the lower bound is used. Setting this parameter very large effectively disables garbage collection. Setting this parameter and to zero causes a full collection to occur at every opportunity.

The maximum number of instruction reload should look backward for equivalent register. Increasing values mean more aggressive optimization, making the compilation time increase with probably slightly better performance.

The maximum number of memory locations cselib should take into account. Increasing values mean more aggressive optimization, making the compilation time increase with probably slightly better performance.

The maximum number of instructions ready to be issued the scheduler should consider at any given time during the first scheduling pass. Increasing values mean more thorough searches, making the compilation time increase with probably little benefit.

The maximum number of blocks in a region to be considered for interblock scheduling.

The maximum number of blocks in a region to be considered for pipelining in the selective scheduler.

The maximum number of insns in a region to be considered for interblock scheduling.

The maximum number of insns in a region to be considered for pipelining in the selective scheduler.

The minimum probability (in percents) of reaching a source block for interblock speculative scheduling.

The maximum number of iterations through CFG to extend regions. A value of 0 disables region extensions.

The maximum conflict delay for an insn to be considered for speculative motion.

The minimal probability of speculation success (in percents), so that speculative insns are scheduled.

The minimum probability an edge must have for the scheduler to save its state across it.

Minimal distance (in CPU cycles) between store and load targeting same memory locations.

The maximum size of the lookahead window of selective scheduling. It is a depth of search for available instructions.

The maximum number of times that an instruction is scheduled during selective scheduling. This is the limit on the number of iterations through which the instruction may be pipelined.

The maximum number of best instructions in the ready list that are considered for renaming in the selective scheduler.

The minimum value of stage count that swing modulo scheduler generates.

The maximum size measured as number of RTLs that can be recorded in an expression in combiner for a pseudo register as last known value of that register.

The maximum number of instructions the RTL combiner tries to combine.

Small integer constants can use a shared data structure, reducing the compiler’s memory usage and increasing its speed. This sets the maximum value of a shared integer constant.

The minimum size of buffers (i.e. arrays) that receive stack smashing protection when is used.

The minimum size of variables taking part in stack slot sharing when not optimizing.

Maximum number of statements allowed in a block that needs to be duplicated when threading jumps.

Maximum number of fields in a structure treated in a field sensitive manner during pointer analysis.

Estimate on average number of instructions that are executed before prefetch finishes. The distance prefetched ahead is proportional to this constant. Increasing this number may also lead to less streams being prefetched (see ).

Maximum number of prefetches that can run at the same time.

The size of cache line in L1 data cache, in bytes.

The size of L1 data cache, in kilobytes.

The size of L2 data cache, in kilobytes.

Whether the loop array prefetch pass should issue software prefetch hints for strides that are non-constant. In some cases this may be beneficial, though the fact the stride is non-constant may make it hard to predict when there is clear benefit to issuing these hints.

Set to 1 if the prefetch hints should be issued for non-constant strides. Set to 0 if prefetch hints should be issued only for strides that are known to be constant and below .

Minimum constant stride, in bytes, to start using prefetch hints for. If the stride is less than this threshold, prefetch hints will not be issued.

This setting is useful for processors that have hardware prefetchers, in which case there may be conflicts between the hardware prefetchers and the software prefetchers. If the hardware prefetchers have a maximum stride they can handle, it should be used here to improve the use of software prefetchers.

A value of -1 means we don’t have a threshold and therefore prefetch hints can be issued for any constant stride.

This setting is only useful for strides that are known and constant.

The values for the C++17 variables and . The destructive interference size is the minimum recommended offset between two independent concurrently-accessed objects; the constructive interference size is the maximum recommended size of contiguous memory accessed together. Typically both will be the size of an L1 cache line for the target, in bytes. For a generic target covering a range of L1 cache line sizes, typically the constructive interference size will be the small end of the range and the destructive size will be the large end.

The destructive interference size is intended to be used for layout, and thus has ABI impact. The default value is not expected to be stable, and on some targets varies with , so use of this variable in a context where ABI stability is important, such as the public interface of a library, is strongly discouraged; if it is used in that context, users can stabilize the value using this option.

The constructive interference size is less sensitive, as it is typically only used in a ‘’ to make sure that a type fits within a cache line.

See also .

The maximum number of stmts in a loop to be interchanged.

The minimum ratio between stride of two loops for interchange to be profitable.

The minimum ratio between the number of instructions and the number of prefetches to enable prefetching in a loop.

The minimum ratio between the number of instructions and the number of memory references to enable prefetching in a loop.

Whether the compiler should use the “canonical” type system. Should always be 1, which uses a more efficient internal mechanism for comparing types in C++ and Objective-C++. However, if bugs in the canonical type system are causing compilation failures, set this value to 0 to disable canonical types.

Switch initialization conversion refuses to create arrays that are bigger than times the number of branches in the switch.

Maximum length of the partial antic set computed during the tree partial redundancy elimination optimization () when optimizing at and above. For some sorts of source code the enhanced partial redundancy elimination optimization can run away, consuming all of the memory available on the host machine. This parameter sets a limit on the length of the sets that are computed, which prevents the runaway behavior. Setting a value of 0 for this parameter allows an unlimited set length.

Maximum loop depth that is value-numbered optimistically. When the limit hits the innermost loops and the outermost loop in the loop nest are value-numbered optimistically and the remaining ones not.

Maximum number of alias-oracle queries we perform when looking for redundancies for loads and stores. If this limit is hit the search is aborted and the load or store is not considered redundant. The number of queries is algorithmically limited to the number of stores on all paths from the load to the function entry.

IRA uses regional register allocation by default. If a function contains more loops than the number given by this parameter, only at most the given number of the most frequently-executed loops form regions for regional register allocation.

Although IRA uses a sophisticated algorithm to compress the conflict table, the table can still require excessive amounts of memory for huge functions. If the conflict table for a function could be more than the size in MB given by this parameter, the register allocator instead uses a faster, simpler, and lower-quality algorithm that does not require building a pseudo-register conflict table.

IRA can be used to evaluate more accurate register pressure in loops for decisions to move loop invariants (see ). The number of available registers reserved for some other purposes is given by this parameter. Default of the parameter is the best found from numerous experiments.

Make IRA to consider matching constraint (duplicated operand number) heavily in all available alternatives for preferred register class. If it is set as zero, it means IRA only respects the matching constraint when it’s in the only available alternative with an appropriate register class. Otherwise, it means IRA will check all available alternatives for preferred register class even if it has found some choice with an appropriate register class and respect the found qualified matching constraint.

LRA tries to reuse values reloaded in registers in subsequent insns. This optimization is called inheritance. EBB is used as a region to do this optimization. The parameter defines a minimal fall-through edge probability in percentage used to add BB to inheritance EBB in LRA. The default value was chosen from numerous runs of SPEC2000 on x86-64.

Loop invariant motion can be very expensive, both in compilation time and in amount of needed compile-time memory, with very large loops. Loops with more basic blocks than this parameter won’t have loop invariant motion optimization performed on them.

Building data dependencies is expensive for very large loops. This parameter limits the number of data references in loops that are considered for data dependence analysis. These large loops are no handled by the optimizations using loop data dependencies.

Sets a maximum number of hash table slots to use during variable tracking dataflow analysis of any function. If this limit is exceeded with variable tracking at assignments enabled, analysis for that function is retried without it, after removing all debug insns from the function. If the limit is exceeded even without debug insns, var tracking analysis is completely disabled for the function. Setting the parameter to zero makes it unlimited.

Sets a maximum number of recursion levels when attempting to map variable names or debug temporaries to value expressions. This trades compilation time for more complete debug information. If this is set too low, value expressions that are available and could be represented in debug information may end up not being used; setting this higher may enable the compiler to find more complex debug expressions, but compile time and memory use may grow.

Sets a threshold on the number of debug markers (e.g. begin stmt markers) to avoid complexity explosion at inlining or expanding to RTL. If a function has more such gimple stmts than the set limit, such stmts will be dropped from the inlined copy of a function, and from its RTL expansion.

Use uids starting at this parameter for nondebug insns. The range below the parameter is reserved exclusively for debug insns created by , but debug insns may get (non-overlapping) uids above it if the reserved range is exhausted.

IPA-SRA replaces a pointer to an aggregate with one or more new parameters only when their cumulative size is less or equal to times the size of the original pointer parameter.

Maximum pieces of an aggregate that IPA-SRA tracks. As a consequence, it is also the maximum number of replacements of a formal parameter.

The two Scalar Reduction of Aggregates passes (SRA and IPA-SRA) aim to replace scalar parts of aggregates with uses of independent scalar variables. These parameters control the maximum size, in storage units, of aggregate which is considered for replacement when compiling for speed () or size () respectively.

The maximum number of artificial accesses that Scalar Replacement of Aggregates (SRA) will track, per one local variable, in order to facilitate copy propagation.

When making copies of thread-local variables in a transaction, this parameter specifies the size in bytes after which variables are saved with the logging functions as opposed to save/restore code sequence pairs. This option only applies when using .

To avoid exponential effects in the Graphite loop transforms, the number of parameters in a Static Control Part (SCoP) is bounded. A value of zero can be used to lift the bound. A variable whose value is unknown at compilation time and defined outside a SCoP is a parameter of the SCoP.

Loop blocking or strip mining transforms, enabled with or , strip mine each loop in the loop nest by a given number of iterations. The strip length can be changed using the parameter.

Specifies number of statements visited during jump function offset discovery.

IPA-CP attempts to track all possible values and types passed to a function’s parameter in order to propagate them and perform devirtualization. is the maximum number of values and types it stores per one formal parameter of a function.

IPA-CP calculates its own score of cloning profitability heuristics and performs those cloning opportunities with scores that exceed .

Maximum depth of recursive cloning for self-recursive function.

Recursive cloning only when the probability of call being executed exceeds the parameter.

When using option, IPA-CP will consider the measured execution count of a call graph edge at this percentage position in their histogram as the basis for its heuristics calculation.

The number of times interprocedural copy propagation expects recursive functions to call themselves.

Percentage penalty the recursive functions will receive when they are evaluated for cloning.

Percentage penalty functions containing a single call to another function will receive when they are evaluated for cloning.

IPA-CP is also capable to propagate a number of scalar values passed in an aggregate. controls the maximum number of such values per one parameter.

When IPA-CP determines that a cloning candidate would make the number of iterations of a loop known, it adds a bonus of to the profitability score of the candidate.

The maximum number of different predicates IPA will use to describe when loops in a function have known properties.

During its analysis of function bodies, IPA-CP employs alias analysis in order to track values pointed to by function parameters. In order not spend too much time analyzing huge functions, it gives up and consider all memory clobbered after examining statements modifying memory.

Maximal number of boundary endpoints of case ranges of switch statement. For switch exceeding this limit, IPA-CP will not construct cloning cost predicate, which is used to estimate cloning benefit, for default case of the switch statement.

IPA-CP will analyze conditional statement that references some function parameter to estimate benefit for cloning upon certain constant value. But if number of operations in a parameter expression exceeds , the expression is treated as complicated one, and is not handled by IPA analysis.

Specify desired number of partitions produced during WHOPR compilation. The number of partitions should exceed the number of CPUs used for compilation.

Size of minimal partition for WHOPR (in estimated instructions). This prevents expenses of splitting very small programs into too many partitions.

Size of max partition for WHOPR (in estimated instructions). to provide an upper bound for individual size of partition. Meant to be used only with balanced partitioning.

Maximal number of parallel processes used for LTO streaming.

The maximum number of namespaces to consult for suggestions when C++ name lookup fails for an identifier.

The maximum relative execution frequency (in percents) of the target block relative to a statement’s original block to allow statement sinking of a statement. Larger numbers result in more aggressive statement sinking. A small positive adjustment is applied for statements with memory operands as those are even more profitable so sink.

The maximum number of conditional store pairs that can be sunk. Set to 0 if either vectorization () or if-conversion () is disabled.

The smallest number of different values for which it is best to use a jump-table instead of a tree of conditional branches. If the value is 0, use the default for the machine.

The maximum code size growth ratio when expanding into a jump table (in percent). The parameter is used when optimizing for size.

The maximum code size growth ratio when expanding into a jump table (in percent). The parameter is used when optimizing for speed.

Set the maximum number of instructions executed in parallel in reassociated tree. This parameter overrides target dependent heuristics used by default if has non zero value.

Choose between the two available implementations of . Algorithm 1 is the original implementation and is the more likely to prevent instructions from being reordered. Algorithm 2 was designed to be a compromise between the relatively conservative approach taken by algorithm 1 and the rather aggressive approach taken by the default scheduler. It relies more heavily on having a regular register file and accurate register pressure classes. See in the GCC sources for more details.

The default choice depends on the target.

Set the maximum number of existing candidates that are considered when seeking a basis for a new straight-line strength reduction candidate.

Enable buffer overflow detection for global objects. This kind of protection is enabled by default if you are using option. To disable global objects protection use .

Enable buffer overflow detection for stack objects. This kind of protection is enabled by default when using . To disable stack protection use option.

Enable buffer overflow detection for memory reads. This kind of protection is enabled by default when using . To disable memory reads protection use .

Enable buffer overflow detection for memory writes. This kind of protection is enabled by default when using . To disable memory writes protection use option.

Enable detection for built-in functions. This kind of protection is enabled by default when using . To disable built-in functions protection use .

Enable detection of use-after-return. This kind of protection is enabled by default when using the option. To disable it use .

Note: By default the check is disabled at run time. To enable it, add to the environment variable .

If number of memory accesses in function being instrumented is greater or equal to this number, use callbacks instead of inline checks. E.g. to disable inline code use .

Enable hwasan instrumentation of statically sized stack-allocated variables. This kind of instrumentation is enabled by default when using and disabled by default when using . To disable stack instrumentation use , and to enable it use .

When using stack instrumentation, decide tags for stack variables using a deterministic sequence beginning at a random tag for each frame. With this parameter unset tags are chosen using the same sequence but beginning from 1. This is enabled by default for and unavailable for . To disable it use .

Enable hwasan instrumentation of dynamically sized stack-allocated variables. This kind of instrumentation is enabled by default when using and disabled by default when using . To disable instrumentation of such variables use , and to enable it use .

Enable hwasan checks on memory reads. Instrumentation of reads is enabled by default for both and . To disable checking memory reads use .

Enable hwasan checks on memory writes. Instrumentation of writes is enabled by default for both and . To disable checking memory writes use .

Enable hwasan instrumentation of builtin functions. Instrumentation of these builtin functions is enabled by default for both and . To disable instrumentation of builtin functions use .

If the size of a local variable in bytes is smaller or equal to this number, directly poison (or unpoison) shadow memory instead of using run-time callbacks.

Emit special instrumentation for accesses to volatiles.

Emit instrumentation calls to __tsan_func_entry() and __tsan_func_exit().

Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path.

Maximum number of basic blocks on a jump thread path.

threader-debug=[none

What's new:

Awarding Winning Work Uses Stochastic Optimization Capabilities of LINGO Software
At the IX National Congress of the Mexican Society for Operations Research, 13 - 15 Oct 2021, José Emmanuel Gómez Rocha, a student at Universidad Autonoma del Estado de Hidalgo, Mexico received the first-place award for the best thesis in the Undergraduate category, with his thesis "Optimization Models Multi-State Stochastics Applied to the Planning of the Production of a Furniture Company.” The work was directed by Prof. Héctor Rivera Gómez and Prof. Eva Selene Hernández Gress.
In his thesis, Gómez Rocha helped a furniture manufacturing company located in the state of Hidalgo, Mexico deal with the problem of how to set mean capacity as well as production levels in the face of uncertain demand when planning production over multiple periods. He used the stochastic optimization capabilities of the LINGO modeling software provided by LINDO Systems. In his work he did extensive analysis of what were the key features that affected expected profit. He looked at things such as is there a big difference between approximating random demand by a three-point distribution vs. a Normal distribution, or using a simple deterministic model as opposed to a model that takes into account uncertainty.

Useful Tips on Building Optimization Based Multi-Period Planning Models
Watch the 30-minute video here


LINDO® products and pandemic models.

LINDO has recently added several models in its MODELS library devoted to modeling pandemics. Learn more.

LINDO adds a Beta version of LINDO® API for Android based hand held devices.
This version offers LINDO API to Android developers who want to incorporate LINDO’s powerful optimizers to their Android applications.
We also include a simple Android application for entering and solving linear, nonlinear and integer optimization models.

YouTube Introduction to LINGO and What'sBest! in Portuguese (Brazilian) Now Available. A collection of over 140 lectures, each of about 5 to 20 minutes in length has recently been made available on YouTube. These videos, in Portuguese, provide a very thorough introduction to the LINGO modeling system and What's Best! add-in to Excel. They start with the very elementary, such as transportation and staff scheduling problems, surplus/slack variables, and proceed to cover the more advanced features of LINGO, including K-best solutions and concepts such as convexity and positive definiteness. The videos have been prepared by Flavio Araujo Lim-Apo a master's student in Production Engineering at DEI/PUC-Rio, who has worked with Prof Dr Silvia Araujo dos Reis and Prof Dr Victor Rafael R Celestino from Universidade de Brasilia (UnB). The Lingo's playlist is available here and the What's Best's playlist is available here.

LINDO Systems has added a new, extensive "How to" modeling document to its library. An extensive collection of problems is presented and then modeled in LINGO. Just a few of the problem types described and modeled are: Agriculture, Assembly Line Balancing, Aviation, Blending/Diet, Clinics, Construction, Cutting, Energy, Fertilizer, Finance, Investment, Logistics, Metallurgy, Refinery, Scheduling, and Transportion. The exercises are complete in that they show not only how to prepare the model but also how to use the various features of LINGO to generate easy to understand reports based on the solutions to the models. This large document is the work product of the energetic Carlos Moya Mulero. He has had many years of experience in Operations Management at Volkswagen and elsewhere.

Speed and ease-of-use have made LINDO Systems a leading supplier of software tools for building and solving optimization models


LINDO®linear, nonlinear, integer, stochastic and global programmingsolvers have been used by thousands of companies worldwide to maximize profit and minimize cost on decisions involving production planning, transportation, finance, portfolio allocation, capital budgeting, blending, scheduling, inventory, resource allocation and more.

Check our Application Models Library and see what our products can do for you with examples from a wide variety of applications.

Источник: [https://torrent-igruha.org/3551-portal.html]

Sysinternals File and Disk Utilities

  • 2 minutes to read

AccessChk
This tool shows you the accesses the user or group you specify has to files, Registry keys or Windows services.

AccessEnum
This simple yet powerful security tool shows you who has what access to directories, files and Registry keys on your systems. Use it to find holes in your permissions.

CacheSet
CacheSet is a program that allows you to control the Cache Manager's working set size using functions provided by NT. It's compatible with all versions of NT.

Contig
Wish you could quickly defragment your frequently used files? Use Contig to optimize individual files, or to create new files that are contiguous.

Disk2vhd
Disk2vhd simplifies the migration of physical systems into virtual machines (p2v).

DiskExt
Display volume disk-mappings.

DiskMon
This utility captures all hard disk activity or acts like a software disk activity light in your system tray.

DiskView
Graphical disk sector utility.

Disk Usage (DU)
View disk usage by directory.

EFSDump
View information for encrypted files.

FindLinks
FindLinks reports the file index and any hard links (alternate file paths on the same volume) that exist for the specified file.  A file's data remains allocated so long as at it has at least one file name referencing it.

Junction
Create Win2K NTFS symbolic links.

LDMDump
Dump the contents of the Logical Disk Manager"s on-disk database, which describes the partitioning of Windows 2000 Dynamic disks.

MoveFile
Schedule file rename and delete commands for the next reboot. This can be useful for cleaning stubborn or in-use malware files.

NTFSInfo
Use NTFSInfo to see detailed information about NTFS volumes, including the size and location of the Master File Table (MFT) and MFT-zone, as well as the sizes of the NTFS meta-data files.

PendMoves
See what files are scheduled for delete or rename the next time the system boots.

Process Monitor
Monitor file system, Registry, process, thread and DLL activity in real-time.

PsFile
See what files are opened remotely.

PsTools
The PsTools suite includes command-line utilities for listing the processes running on local or remote computers, running processes remotely, rebooting computers, dumping event logs, and more.

SDelete
Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.

ShareEnum
Scan file shares on your network and view their security settings to close security holes.

Sigcheck
Dump file version information and verify that images on your system are digitally signed.

Streams
Reveal NTFS alternate streams.

Sync
Flush cached data to disk.

VolumeID
Set Volume ID of FAT or NTFS drives.

Источник: [https://torrent-igruha.org/3551-portal.html]

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