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Merge branch 'master' of https://github.com/MicrosoftDocs/cpp-docs-pr into Release-17.0
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‎docs/_breadcrumb/toc.yml‎

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- name: Docs
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tocHref: /
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topicHref: /

‎docs/assembler/toc.yml‎

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- name: Compiler intrinsics and assembly language
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href: ../intrinsics/index.yml
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- name: Compiler intrinsics

‎docs/atl-mfc-shared/toc.yml‎

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- name: ATL-MFC shared classes
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href: ../atl-mfc-shared/atl-mfc-shared-classes.md
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- name: ATL-MFC concepts

‎docs/atl/toc.yml‎

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- name: Active Template Library (ATL)
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href: atl-com-desktop-components.md
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- name: Active Template Library (ATL) concepts

‎docs/build-insights/toc.yml‎

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- name: "C++ Build Insights"
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- name: "Get started with C++ Build Insights"

‎docs/build/reference/analyze-code-analysis.md‎

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---
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title: "/analyze (Code analysis)"
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description: "The Microsoft C++ compiler /analyze option syntax and usage."
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ms.date: 05/21/2021
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ms.date: 10/19/2021
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f1_keywords: ["VC.Project.VCCLCompilerTool.EnablePREfast", "/analyze", "VC.Project.VCCLCompilerTool.PREfastAdditionalOptions", "VC.Project.VCCLCompilerTool.PREfastAdditionalPlugins"]
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helpviewer_keywords: ["/analyze compiler option [C++]", "-analyze compiler option [C++]", "analyze compiler option [C++]"]
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ms.assetid: 81da536a-e030-4bd4-be18-383927597d08
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**`/analyze`**\[**`-`**]\
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Turns on code analysis. Use **`/analyze-`** to explicitly turn off analysis. **`/analyze-`** is the default behavior.
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By default, analysis output goes to the console or the Visual Studio Output window like other error messages. Code analysis also creates a log file named *`filename.nativeanalysis.xml`*, where *`filename`* is the name of the analyzed source file.
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By default, analysis output goes to the console or the Visual Studio Output window like other error messages. Code analysis also creates a log file named *`filename.nativecodeanalysis.xml`*, where *`filename`* is the name of the analyzed source file.
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**`/analyze:only`**\
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By default, the compiler compiles the code to generate object files before code analysis runs. The **`/analyze:only`** option makes the compiler skip the code generation pass, and does code analysis directly. Compiler errors still prevent code analysis from running. However, the compiler won't report other warnings that it might find during the code generation pass. If the program isn't free of code-generation warnings, analysis results might be unreliable. We recommend you use this option only if the code passes code-generation syntax checks without errors or warnings.

‎docs/build/reference/og-global-optimizations.md‎

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title: "/Og (Global Optimizations)"
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description: "Describes the deprecated MSVC compiler option /Og, formerly used to enable global optimizations."
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ms.date: 07/08/2020
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ms.date: 10/19/2021
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f1_keywords: ["VC.Project.VCCLCompilerTool.GlobalOptimizations", "/og"]
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helpviewer_keywords: ["-Og compiler option [C++]", "global optimizations compiler option [C++]", "automatic register allocation", "/Og compiler option [C++]", "loop structures, optimizing", "common subexpression elimination", "Og compiler option [C++]"]
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- Automatic register allocation
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This optimization allows the compiler to store frequently used variables and subexpressions in registers; the **`register`** keyword is ignored.
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This optimization allows the compiler to store frequently used variables and subexpressions in registers. The **`register`** keyword is ignored by default, and causes a diagnostic under **`/std:c++17`** or later.
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- Loop optimization
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> [!NOTE]
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> You can enable or disable global optimization on a function-by-function basis using the `optimize` pragma together with the `g` option.
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For related information, see [`/Oi` (Generate intrinsic functions)](oi-generate-intrinsic-functions.md) and [`/Ox`(Enable most speed optimizations)](ox-full-optimization.md).
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For related information, see [`/Oi` (Generate intrinsic functions)](oi-generate-intrinsic-functions.md) and [`/Ox` (Enable most speed optimizations)](ox-full-optimization.md).
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### To set this compiler option in the Visual Studio development environment
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‎docs/build/toc.yml‎

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- name: Projects and build systems
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- name: Visual Studio projects - C++

‎docs/c-language/register-storage-class-specifier.md‎

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description: "Learn more about: register Storage-Class Specifier"
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title: "register Storage-Class Specifier"
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ms.date: "11/04/2016"
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description: "Learn more about: register storage-class specifier"
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title: "register storage-class specifier"
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ms.date: 10/19/2021
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helpviewer_keywords: ["register variables", "register storage class"]
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ms.assetid: 7577bf48-88ec-4191-873c-ef4217a4034e
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---
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# register Storage-Class Specifier
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# `register` storage-class specifier
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**Microsoft Specific**
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The Microsoft C/C++ compiler does not honor user requests for register variables. However, for portability all other semantics associated with the **`register`** keyword are honored by the compiler. For example, you cannot apply the unary address-of operator (**&**) to a register object nor can the **`register`** keyword be used on arrays.
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The Microsoft C/C++ compiler doesn't honor user requests for register variables. However, for portability all other semantics associated with the **`register`** keyword are honored by the compiler. For example, you can't apply the unary address-of operator (**`&`**) to a register object nor can the **`register`** keyword be used on arrays.
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**END Microsoft Specific**
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## See also
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[Storage-Class Specifiers for Internal-Level Declarations](../c-language/storage-class-specifiers-for-internal-level-declarations.md)
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[Storage-class specifiers for internal-level declarations](../c-language/storage-class-specifiers-for-internal-level-declarations.md)

‎docs/c-language/toc.yml‎

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- name: C language reference

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