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Fix x86 Windows build by guarding _mul128 to x64 only

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copilot-swe-agent[bot] 2026-07-15 05:44:02 +00:00 • committed by GitHub
parent 3b28cc9977
commit efd31bd53c
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1 changed files with 2 additions and 2 deletions
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src/util/mpz.cpp
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@ -34,8 +34,8 @@ static bool mul_overflows(int64_t a, int64_t b, int64_t & result) {
return std::ckd_mul(&result, a, b);
#elif defined(__GNUC__)
return __builtin_mul_overflow(a, b, &result);
#elif defined(_MSC_VER) && !defined(_M_ARM64) && !defined(_M_ARM64EC)
// MSVC exposes _mul128 on x64 targets, but not on ARM64/ARM64EC.
#elif defined(_MSC_VER) && defined(_M_X64)
// MSVC exposes _mul128 only when targeting x64.
__int64 high;
result = _mul128(a, b, &high);
// Overflow if high bits are not the sign extension of result