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Fix use of intrinsics on windows ARM platforms #70

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Aug 11, 2023
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Fix use of intrinsics on windows ARM platforms #70

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16 changes: 11 additions & 5 deletions include/boost/charconv/detail/emulated128.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -831,11 +831,16 @@ BOOST_CHARCONV_CXX14_CONSTEXPR uint128 &uint128::operator%=(uint128 v) noexcept

static inline std::uint64_t umul64(std::uint32_t x, std::uint32_t y) noexcept
{
#if defined(BOOST_CHARCONV_HAS_MSVC_32BIT_INTRINSICS)
// __emulu is not available on ARM https://learn.microsoft.com/en-us/cpp/intrinsics/emul-emulu?view=msvc-170
#if defined(BOOST_CHARCONV_HAS_MSVC_32BIT_INTRINSICS) && !defined(_M_ARM64)

return __emulu(x, y);
#else

#else

return x * static_cast<std::uint64_t>(y);
#endif

#endif
}

// Get 128-bit result of multiplication of two 64-bit unsigned integers.
Expand All @@ -845,8 +850,9 @@ BOOST_CHARCONV_SAFEBUFFERS inline uint128 umul128(std::uint64_t x, std::uint64_t

auto result = static_cast<boost::uint128_type>(x) * static_cast<boost::uint128_type>(y);
return {static_cast<std::uint64_t>(result >> 64), static_cast<std::uint64_t>(result)};

#elif defined(BOOST_CHARCONV_HAS_MSVC_64BIT_INTRINSICS)

// _umul128 is x64 only https://learn.microsoft.com/en-us/cpp/intrinsics/umul128?view=msvc-170
#elif defined(BOOST_CHARCONV_HAS_MSVC_64BIT_INTRINSICS) && !defined(_M_ARM64)

unsigned long long high;
std::uint64_t low = _umul128(x, y, &high);
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