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

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Merged
Stephan T. Lavavej (StephanTLavavej) merged 9 commits into from
Mar 4, 2026
Merged

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
fd3b1ff
-stray comment
AlexGuteniev Feb 25, 2026
eef5a40
spell
AlexGuteniev Feb 25, 2026
f09b8b9
Welcome `search_n`!
AlexGuteniev Feb 25, 2026
be5409b
Merge branch 'microsoft:main' into fallback-testing
AlexGuteniev Feb 28, 2026
59215d9
Just crosslist the macro.
StephanTLavavej Mar 3, 2026
0ffd362
Restrict the effect to ARM64EC, but don't emit an error otherwise.
StephanTLavavej Mar 3, 2026
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4 changes: 3 additions & 1 deletion stl/inc/xutility
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Original file line number Diff line number Diff line change
Expand Up @@ -58,10 +58,12 @@ _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 !_USE_STD_VECTOR_ALGORITHMS
#define _VECTORIZED_FOR_X64_X86 0
#define _VECTORIZED_FOR_X64_X86_ARM64_ARM64EC 0
#elif defined(_M_ARM64) || defined(_M_ARM64EC)
#elif defined(_M_ARM64) || (defined(_M_ARM64EC) && !defined(_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC))
#define _VECTORIZED_FOR_X64_X86 0
#define _VECTORIZED_FOR_X64_X86_ARM64_ARM64EC 1
#elif defined(_M_X64) || defined(_M_IX86)
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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 @@ -5,3 +5,4 @@ RUNALL_INCLUDE ..\usual_matrix.lst
RUNALL_CROSSLIST
* PM_CL=""
* PM_CL="/D_USE_STD_VECTOR_ALGORITHMS=0"
* PM_CL="/D_CALL_ALL_X64_VECTOR_ALGORITHMS_ON_ARM64EC"
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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self.requires.append('arm64ec')
elif flag[1:] == 'MDd':
self._addCustomFeature('MDd')
self._addCustomFeature('debug_CRT')
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