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libstdc++: Support aarch64-w64-mingw32 target in fast_float

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This patch resolves the GCC compilation issue for the C++ language
targeting aarch64-w64-mingw32.

The change in fast_float has been upstreamed.
https://github.com/fastfloat/fast_float/pull/269

libstdc++-v3/ChangeLog:

	* src/c++17/fast_float/fast_float.h (full_multiplication):
	Support aarch64-w64-mingw32 target.
This commit is contained in:
Evgeny Karpov 2024-09-03 09:09:52 +00:00 • committed by Jonathan Wakely
parent 648d5c26e2
commit c3ba75f6ac
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1 changed files with 2 additions and 1 deletions
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libstdc++-v3/src/c++17/fast_float/fast_float.h
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@ -275,7 +275,8 @@ fastfloat_really_inline value128 full_multiplication(uint64_t a,
// But MinGW on ARM64 doesn't have native support for 64-bit multiplications
answer.high = __umulh(a, b);
answer.low = a * b;
#elif defined(FASTFLOAT_32BIT) || (defined(_WIN64) && !defined(__clang__))
#elif defined(FASTFLOAT_32BIT) || \
(defined(_WIN64) && !defined(__clang__) && !defined(_M_ARM64))
answer.low = _umul128(a, b, &answer.high); // _umul128 not available on ARM64
#elif defined(FASTFLOAT_64BIT)
__uint128_t r = ((__uint128_t)a) * b;