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<__msvc_int128.hpp>: use __umulh on ARM64/ARM64EC (#6184) #6281

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<__msvc_int128.hpp>: use __umulh on ARM64/ARM64EC (#6184) #6281

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7 changes: 6 additions & 1 deletion stl/inc/__msvc_int128.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,12 @@ struct alignas(16) _Base128 {
if (!_Is_constant_evaluated()) {
return _umul128(_Left, _Right, &_High_result);
}
#endif // _STL_128_INTRINSICS
#elif (defined(_M_ARM64) || defined(_M_ARM64EC)) && !defined(_M_CEE_PURE)
if (!_Is_constant_evaluated()) {
_High_result = __umulh(_Left, _Right);
return _Left * _Right;
}
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#endif // ^^^ (defined(_M_ARM64) || defined(_M_ARM64EC)) && !defined(_M_CEE_PURE) ^^^

const uint32_t __u[2] = {
static_cast<uint32_t>(_Left),
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