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Optimize find for ARM64EC #5597

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Merged
merged 2 commits into from
Jul 15, 2025
+8 −0
Merged

Optimize find for ARM64EC #5597

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59de6de
Optimize `find` for ARM64EC
AlexGuteniev Jun 16, 2025
def468e
Fix wmemchr() count.
StephanTLavavej Jun 27, 2025
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8 changes: 8 additions & 0 deletions stl/src/vector_algorithms.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3297,12 +3297,20 @@ const void* __stdcall __std_find_trivial_unsized_8(const void* const _First, con

const void* __stdcall __std_find_trivial_1(
const void* const _First, const void* const _Last, const uint8_t _Val) noexcept {
#ifdef _M_ARM64EC
return memchr(_First, _Val, _Byte_length(_First, _Last));
#else
return _Finding::_Find_impl<_Finding::_Find_traits_1, _Finding::_Predicate::_Equal>(_First, _Last, _Val);
#endif
}

const void* __stdcall __std_find_trivial_2(
const void* const _First, const void* const _Last, const uint16_t _Val) noexcept {
#ifdef _M_ARM64EC
return wmemchr(static_cast<const wchar_t*>(_First), _Val, _Byte_length(_First, _Last) / sizeof(wchar_t));
#else
return _Finding::_Find_impl<_Finding::_Find_traits_2, _Finding::_Predicate::_Equal>(_First, _Last, _Val);
#endif
}

const void* __stdcall __std_find_trivial_4(
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