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Vector algorithms: runtime coverage for ARM64EC non-vectorized fallbacks again #6107

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Vector algorithms: runtime coverage for ARM64EC non-vectorized fallbacks again #6107

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bcdb3c8
Debug control macro
AlexGuteniev Feb 25, 2026
2075d8e
feature control
AlexGuteniev Feb 25, 2026
5742a36
matrices
AlexGuteniev Feb 25, 2026
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-stray comment
AlexGuteniev Feb 25, 2026
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AlexGuteniev Feb 25, 2026
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Welcome `search_n`!
AlexGuteniev Feb 25, 2026
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Merge branch 'microsoft:main' into fallback-testing
AlexGuteniev Feb 28, 2026
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9 changes: 9 additions & 0 deletions stl/inc/xutility
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Original file line number Diff line number Diff line change
Expand Up @@ -58,9 +58,18 @@ _STL_DISABLE_CLANG_WARNINGS
// In the STL's implementation, we inspect the following detection macros,
// because various algorithms are vectorized for various architectures.

// _CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC is a macro to test ARM64EC fallbacks for x64 algorithms

#if defined(_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC) && !defined(_M_ARM64EC)
#error _CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC should only be defined on _M_ARM64EC
#endif // defined(_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC) && !defined(_M_ARM64EC)

#if !_USE_STD_VECTOR_ALGORITHMS
#define _VECTORIZED_FOR_X64_X86 0
#define _VECTORIZED_FOR_X64_X86_ARM64_ARM64EC 0
#elif defined(_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC)
#define _VECTORIZED_FOR_X64_X86 1
#define _VECTORIZED_FOR_X64_X86_ARM64_ARM64EC 1
#elif defined(_M_ARM64) || defined(_M_ARM64EC)
#define _VECTORIZED_FOR_X64_X86 0
#define _VECTORIZED_FOR_X64_X86_ARM64_ARM64EC 1
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1 change: 1 addition & 0 deletions tests/std/tests/VSO_0000000_vector_algorithms/env.lst
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Expand Up @@ -2,6 +2,7 @@
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

RUNALL_INCLUDE ..\usual_matrix.lst
RUNALL_INCLUDE ..\arm64ec_vector_fallbacks_suffix.lst
RUNALL_CROSSLIST
* PM_CL=""
* PM_CL="/D_USE_STD_VECTOR_ALGORITHMS=0"
13 changes: 13 additions & 0 deletions tests/std/tests/arm64ec_vector_fallbacks_suffix.lst
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@@ -0,0 +1,13 @@
# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MTd /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC"
ASAN PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MTd /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC -fsanitize=address /Zi" PM_LINK="/debug"
PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MT /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC"
ASAN PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MT /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC -fsanitize=address /Zi" PM_LINK="/debug"
PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MDd /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC"
ASAN PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MDd /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC -fsanitize=address /Zi" PM_LINK="/debug"
PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MD /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC"
ASAN PM_CL="/w14640 /Zc:threadSafeInit- /EHsc /std:c++latest /MD /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC -fsanitize=address /Zi" PM_LINK="/debug"
PM_COMPILER="clang-cl" PM_CL="-fno-ms-compatibility -fno-delayed-template-parsing -Wno-unqualified-std-cast-call /permissive- /EHsc /MD /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC --start-no-unused-arguments"
PM_COMPILER="clang-cl" PM_CL="-fno-ms-compatibility -fno-delayed-template-parsing -Wno-unqualified-std-cast-call /permissive- /EHsc /MT /D_ITERATOR_DEBUG_LEVEL=0 /D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC --start-no-unused-arguments"
2 changes: 2 additions & 0 deletions tests/utils/stl/test/tests.py
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Expand Up @@ -316,6 +316,8 @@ def _parseFlags(self, litConfig):
self.requires.append('edg') # available for x64, see features.py
elif flag[1:] == 'arch:AVX2':
self.requires.append('arch_avx2') # available for x86 and x64, see features.py
elif flag[1:] == 'D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC':
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@AlexGuteniev AlexGuteniev Feb 25, 2026

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'D' + '_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC' might be a better spelling for search.

self.requires.append('arm64ec')
elif flag[1:] == 'MDd':
self._addCustomFeature('MDd')
self._addCustomFeature('debug_CRT')
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