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Added Arm64 feature detections in STL #6067

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Merged
StephanTLavavej merged 4 commits into from
Feb 11, 2026
+40 −0
Merged

Added Arm64 feature detections in STL #6067

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22ec516
Added Arm64 feature detections in STL
Feb 3, 2026
cb41f79
Merge branch 'main' into arm64-feature-detection
StephanTLavavej Feb 4, 2026
dff80d8
Consolidate header inclusions, capitalize Windows.h.
StephanTLavavej Feb 4, 2026
06adf3d
Add space.
StephanTLavavej Feb 4, 2026
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40 changes: 40 additions & 0 deletions stl/src/vector_algorithms.cpp
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@StephanTLavavej StephanTLavavej Feb 4, 2026

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When creating a new PR, please ensure that your main is up to date, and that your feature branch is properly synced. (Ideally, clean commits rebased on top of main.) Your branch was relative to main as of 2025-10-10 which was pretty old for such a fast-moving file as vector_algorithms.cpp. In this case it made no difference, just something to remember for the future!

Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@

#ifdef _M_ARM64
#include <arm64_neon.h>

#include <Windows.h>
#elif !defined(_M_ARM64EC)
#include <intrin.h>
#include <isa_availability.h>
Expand Down Expand Up @@ -54,6 +56,44 @@ namespace {
}
#endif // ^^^ !defined(_M_ARM64) && !defined(_M_ARM64EC) ^^^

#if defined(_M_ARM64)
bool _Use_FEAT_DotProd() noexcept {
return IsProcessorFeaturePresent(PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_I8MM() noexcept {
return IsProcessorFeaturePresent(PF_ARM_V82_I8MM_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_SHA3() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SHA3_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_SVE() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SVE_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_SVE2() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_SVE2p1() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SVE2_1_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_SVE_SHA3() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SVE_SHA3_INSTRUCTIONS_AVAILABLE);
}

bool _Use_FEAT_AES() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SVE_AES_INSTRUCTIONS_AVAILABLE);
}
Comment on lines +88 to +90
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@StephanTLavavej StephanTLavavej Feb 4, 2026

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As mentioned in the discussion, the cryptography stuff is going to be unused by the STL, but I am fine with merging all of this for now, then we can garbage-collect the unused functions when we have the full suite of STL vectorized algorithms for ARM64 completed. These are helpers in an unnamed namespace, so they can be removed without fear of breaking the import lib's compatibility.


bool _Use_FEAT_BitPerm() noexcept {
return IsProcessorFeaturePresent(PF_ARM_SVE_BITPERM_INSTRUCTIONS_AVAILABLE);
}
#endif // ^^^ defined(_M_ARM64) ^^^

size_t _Byte_length(const void* const _First, const void* const _Last) noexcept {
return static_cast<const unsigned char*>(_Last) - static_cast<const unsigned char*>(_First);
}
Expand Down