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Add MSVC-internal workaround for ARM64 popcount intrinsics #4733

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Merged
Stephan T. Lavavej (StephanTLavavej) merged 1 commit into from
Jun 18, 2024
Merged

Add MSVC-internal workaround for ARM64 popcount intrinsics #4733

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5 changes: 3 additions & 2 deletions stl/inc/__msvc_bit_utils.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -300,8 +300,9 @@ _NODISCARD int _Checked_x86_x64_countr_zero(const _Ty _Val) noexcept {

#endif // _HAS_TZCNT_BSF_INTRINSICS

#if (defined(_M_IX86) || defined(_M_X64) || defined(_M_ARM64)) && !defined(_M_CEE_PURE) && !defined(__CUDACC__) \
&& !defined(__INTEL_COMPILER)
// TRANSITION, remove `_MSC_VER > 1940` check after MSVC-internal toolset update
#if (defined(_M_IX86) || defined(_M_X64) || (defined(_M_ARM64) && _MSC_VER > 1940)) && !defined(_M_CEE_PURE) \
&& !defined(__CUDACC__) && !defined(__INTEL_COMPILER)
#define _HAS_POPCNT_INTRINSICS 1
#if defined(__AVX__) || defined(_M_ARM64) || defined(_M_ARM64EC)
#define _POPCNT_INTRINSICS_ALWAYS_AVAILABLE 1
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