microsoft
diff --git a/‎CMakeLists.txt
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diff --git a/‎CMakePresets.json
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diff --git a/‎README.md
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diff --git a/‎azure-devops/asan-pipeline.yml
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diff --git a/‎azure-devops/provision-image.ps1
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diff --git a/‎azure-pipelines.yml
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+1-32Lines changed: 1 addition & 32 deletions b/‎azure-pipelines.yml
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diff --git a/‎benchmarks/CMakeLists.txt
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diff --git a/‎stl/inc/__msvc_bit_utils.hpp
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diff --git a/‎stl/inc/__msvc_chrono.hpp
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diff --git a/‎stl/inc/__msvc_int128.hpp
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+4-8Lines changed: 4 additions & 8 deletions b/‎stl/inc/__msvc_int128.hpp
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+4-8Lines changed: 4 additions & 8 deletions
@@ -67,11 +67,6 @@ elseif(VCLIBS_TARGET_ARCHITECTURE STREQUAL "x64")
     set(VCLIBS_I386_OR_AMD64 "amd64")
     set(VCLIBS_X86_OR_X64 "x64")
     add_compile_definitions(_AMD64_ _VCRT_WIN32_WINNT=0x0501 _STL_WIN32_WINNT=0x0501)
-elseif(VCLIBS_TARGET_ARCHITECTURE MATCHES "^(arm|armv7)$")
-    set(VCLIBS_TARGET_ARCHITECTURE "arm")
-    set(VCLIBS_I386_OR_AMD64 "arm")
-    set(VCLIBS_X86_OR_X64 "arm")
-    add_compile_definitions(_ARM_ _VCRT_WIN32_WINNT=0x0602 _STL_WIN32_WINNT=0x0602)
 elseif(VCLIBS_TARGET_ARCHITECTURE STREQUAL "arm64")
     set(VCLIBS_TARGET_ARCHITECTURE "arm64")
     set(VCLIBS_I386_OR_AMD64 "arm64")
 
@@ -46,26 +46,6 @@
         ]
       }
     },
-    {
-      "name": "ARM",
-      "inherits": "base",
-      "description": "ARM Ninja Config",
-      "architecture": {
-        "strategy": "external",
-        "value": "ARM"
-      },
-      "condition": {
-        "type": "inList",
-        "string": "$env{Platform}",
-        "list": [
-          "arm",
-          ""
-        ]
-      },
-      "cacheVariables": {
-        "TESTS_BUILD_ONLY": true
-      }
-    },
     {
       "name": "ARM64",
       "inherits": "base",
@@ -119,11 +99,6 @@
       "configurePreset": "x64",
       "description": "Build x64 STL"
     },
-    {
-      "name": "ARM",
-      "configurePreset": "ARM",
-      "description": "Build ARM STL"
-    },
     {
       "name": "ARM64",
       "configurePreset": "ARM64",
 
@@ -39,7 +39,7 @@ soon as possible.)
 and fully ported libcxx to run under [lit][] using the various configurations/compilers we test internally.
 
 * Continuous Integration: **In progress.** We've set up Azure Pipelines to validate changes to the repository.
-Currently, it builds the STL (native desktop for x86, x64, ARM, and ARM64). Also, it strictly verifies that all of our
+Currently, it builds the STL (native desktop for x86, x64, and ARM64). Also, it strictly verifies that all of our
 files have been formatted with [clang-format][] and follow our other whitespace conventions.
 
 * Contribution Guidelines: **Coming soon.** Working on the STL's code involves following many rules. We have codebase
@@ -145,8 +145,6 @@ Just try to follow these rules, so we can spend more time fixing bugs and implem
     * Select "Windows 11 SDK (10.0.26100.3916)" in the VS Installer.
     * Select "MSVC v143 - VS 2022 C++ ARM64/ARM64EC build tools (Latest)" in the VS Installer
     if you would like to build the ARM64/ARM64EC target.
-    * Select "MSVC v143 - VS 2022 C++ ARM build tools (Latest)" in the VS Installer
-    if you would like to build the ARM target.
     * We recommend selecting "C++ CMake tools for Windows" in the VS Installer.
     This will ensure that you're using supported versions of CMake and Ninja.
     * Otherwise, install [CMake][] 3.31.0 or later, and [Ninja][] 1.12.1 or later.
@@ -164,8 +162,6 @@ Just try to follow these rules, so we can spend more time fixing bugs and implem
     * Select "Windows 11 SDK (10.0.26100.3916)" in the VS Installer.
     * Select "MSVC v143 - VS 2022 C++ ARM64/ARM64EC build tools (Latest)" in the VS Installer
     if you would like to build the ARM64/ARM64EC target.
-    * Select "MSVC v143 - VS 2022 C++ ARM build tools (Latest)" in the VS Installer
-    if you would like to build the ARM target.
     * We recommend selecting "C++ CMake tools for Windows" in the VS Installer.
     This will ensure that you're using supported versions of CMake and Ninja.
     * Otherwise, install [CMake][] 3.31.0 or later, and [Ninja][] 1.12.1 or later.
@@ -188,14 +184,6 @@ To build the x64 target (recommended):
 3. `cmake --preset x64`
 4. `cmake --build --preset x64`
 
-To build the ARM target:
-
-1. `"C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Auxiliary\Build\vcvarsall.bat" x64_arm`
-    * If you installed VS to a non-default location, change this path accordingly.
-2. Change directories to the previously cloned `STL` directory.
-3. `cmake --preset ARM`
-4. `cmake --build --preset ARM`
-
 To build the ARM64 target:
 
 1. `"C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Auxiliary\Build\vcvarsall.bat" x64_arm64`
 
@@ -45,4 +45,4 @@ stages:
           asanBuild: true
           testTargets: STL-ASan-CI
 
-  # no coverage for ARM and ARM64
+  # no coverage for ARM64
@@ -25,7 +25,6 @@ $VisualStudioWorkloads = @(
   'Microsoft.VisualStudio.Component.VC.CMake.Project',
   'Microsoft.VisualStudio.Component.VC.CoreIde',
   'Microsoft.VisualStudio.Component.VC.Llvm.Clang',
-  'Microsoft.VisualStudio.Component.VC.Tools.ARM',
   'Microsoft.VisualStudio.Component.VC.Tools.ARM64',
   'Microsoft.VisualStudio.Component.VC.Tools.ARM64EC',
   'Microsoft.VisualStudio.Component.VC.Tools.x86.x64',
 
@@ -1,7 +1,7 @@
 # Copyright (c) Microsoft Corporation.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-# Build STL targeting x86, x64, arm, arm64, arm64ec
+# Build STL targeting x86, x64, arm64, arm64ec
 
 variables:
   - template: azure-devops/config.yml
@@ -52,22 +52,6 @@ stages:
           numShards: 1
           skipTesting: true
 
-#  - stage: Early_Build_ARM
-#    dependsOn: []
-#    displayName: 'Early Build ARM'
-#    pool:
-#      name: ${{ variables.poolName }}
-#      demands: ${{ variables.poolDemands }}
-#    jobs:
-#      - template: azure-devops/build-and-test.yml
-#        parameters:
-#          hostArch: x64
-#          targetArch: arm
-#          targetPlatform: arm
-#          analyzeBuild: true
-#          numShards: 1
-#          skipTesting: true
-
   - stage: Early_Build_ARM64
     dependsOn: []
     displayName: 'Early Build ARM64'
@@ -107,7 +91,6 @@ stages:
       - Code_Format
       - Early_Build_x64
       - Early_Build_x86
-#      - Early_Build_ARM
       - Early_Build_ARM64
       - Early_Build_ARM64EC
     displayName: 'Build and Test x64'
@@ -134,20 +117,6 @@ stages:
           targetArch: x86
           targetPlatform: x86
 
-#  - stage: Build_And_Test_ARM
-#    dependsOn: Build_And_Test_x64
-#    displayName: 'Build and Test ARM'
-#    pool:
-#      name: ${{ variables.poolName }}
-#      demands: ${{ variables.poolDemands }}
-#    jobs:
-#      - template: azure-devops/build-and-test.yml
-#        parameters:
-#          hostArch: x64
-#          targetArch: arm
-#          targetPlatform: arm
-#          testsBuildOnly: true
-
   - stage: Build_And_Test_ARM64
     dependsOn: Build_And_Test_x64
     displayName: 'Build and Test ARM64'
 
@@ -23,8 +23,6 @@ if(DEFINED STL_BINARY_DIR)
         set(VCLIBS_I386_OR_AMD64 "i386")
     elseif(VCLIBS_TARGET_ARCHITECTURE STREQUAL "x64")
         set(VCLIBS_I386_OR_AMD64 "amd64")
-    elseif(VCLIBS_TARGET_ARCHITECTURE MATCHES "^(arm|armv7)$")
-        set(VCLIBS_I386_OR_AMD64 "arm")
     elseif(VCLIBS_TARGET_ARCHITECTURE STREQUAL "arm64")
         set(VCLIBS_I386_OR_AMD64 "arm64")
     elseif(VCLIBS_TARGET_ARCHITECTURE STREQUAL "arm64ec")
 
@@ -126,9 +126,9 @@ _NODISCARD int _Checked_x86_x64_countl_zero(const _Ty _Val) noexcept {
 }
 #endif // (defined(_M_IX86) && !defined(_M_HYBRID_X86_ARM64)) || (defined(_M_X64) && !defined(_M_ARM64EC))
 
-#if defined(_M_ARM) || defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
+#if defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
 template <class _Ty>
-_NODISCARD int _Checked_arm_arm64_countl_zero(const _Ty _Val) noexcept {
+_NODISCARD int _Checked_arm64_countl_zero(const _Ty _Val) noexcept {
     constexpr int _Digits = _Unsigned_integer_digits<_Ty>;
     if (_Val == 0) {
         return _Digits;
@@ -140,7 +140,7 @@ _NODISCARD int _Checked_arm_arm64_countl_zero(const _Ty _Val) noexcept {
         return static_cast<int>(_CountLeadingZeros64(_Val));
     }
 }
-#endif // defined(_M_ARM) || defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
+#endif // defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
 #endif // _HAS_COUNTL_ZERO_INTRINSICS
 
 // Implementation of countr_zero without using specialized CPU instructions.
@@ -157,14 +157,14 @@ _NODISCARD constexpr int _Countr_zero_fallback(const _Ty _Val) noexcept {
 template <class _Ty>
 _NODISCARD constexpr int _Popcount_fallback(_Ty _Val) noexcept {
     constexpr int _Digits = _Unsigned_integer_digits<_Ty>;
-#if (defined(_M_IX86) && !defined(_M_HYBRID_X86_ARM64)) || defined(_M_ARM)
+#if defined(_M_IX86) && !defined(_M_HYBRID_X86_ARM64)
     if constexpr (_Digits == 64) {
         // 64-bit bit operations on architectures without 64-bit registers are less efficient,
         // hence we split the value so that it fits in 32-bit registers
         return _Popcount_fallback(static_cast<unsigned long>(_Val))
              + _Popcount_fallback(static_cast<unsigned long>(_Val >> 32));
     } else
-#endif // (defined(_M_IX86) && !defined(_M_HYBRID_X86_ARM64)) || defined(_M_ARM)
+#endif // defined(_M_IX86) && !defined(_M_HYBRID_X86_ARM64)
     {
         // we static_cast these bit patterns in order to truncate them to the correct size
         _Val = static_cast<_Ty>(_Val - ((_Val >> 1) & static_cast<_Ty>(0x5555'5555'5555'5555ull)));
 
@@ -669,7 +669,7 @@ namespace chrono {
                 constexpr long long _Multiplier = period::den / _TenMHz;
                 return time_point(duration(_Ctr * _Multiplier));
             } else if (_Freq == _TwentyFourMHz) {
-                // 24 MHz is a common frequency on ARM/ARM64, including cases where it emulates x86/x64.
+                // 24 MHz is a common frequency on ARM64, including cases where it emulates x86/x64.
                 const long long _Whole = (_Ctr / _TwentyFourMHz) * period::den;
                 const long long _Part  = (_Ctr % _TwentyFourMHz) * period::den / _TwentyFourMHz;
                 return time_point(duration(_Whole + _Part));
 
@@ -56,21 +56,17 @@ _NODISCARD constexpr int _Countl_zero_internal(const _Ty _Val) noexcept {
     if (!_Is_constant_evaluated()) {
         return _Checked_x86_x64_countl_zero(_Val);
     }
-#elif defined(_M_ARM) || defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
+#elif defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
     if (!_Is_constant_evaluated()) {
-        return _Checked_arm_arm64_countl_zero(_Val);
+        return _Checked_arm64_countl_zero(_Val);
     }
-#endif // defined(_M_ARM) || defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
+#endif // defined(_M_ARM64) || defined(_M_ARM64EC) || defined(_M_HYBRID_X86_ARM64)
 #endif // _HAS_COUNTL_ZERO_INTRINSICS
 
     return _Countl_zero_fallback(_Val);
 }
 
-struct
-#ifndef _M_ARM
-    alignas(16)
-#endif
-        _Base128 {
+struct alignas(16) _Base128 {
     uint64_t _Word[2];
 
     constexpr void _Left_shift(const unsigned char _Count) noexcept {