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Document MSVC ARM64 magnitude extraction

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copilot-swe-agent[bot] 2026-07-15 05:16:21 +00:00 • committed by GitHub
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src/util/mpz.cpp
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@ -38,6 +38,7 @@ static bool mul_overflows(int64_t a, int64_t b, int64_t & result) {
// Overflow if high bits are not the sign extension of result
return high != (result >> 63);
#elif defined(_MSC_VER)
// Extract magnitudes without ever evaluating -INT64_MIN.
uint64_t x = a < 0 ? static_cast<uint64_t>(-(a + 1)) + 1 : static_cast<uint64_t>(a);
uint64_t y = b < 0 ? static_cast<uint64_t>(-(b + 1)) + 1 : static_cast<uint64_t>(b);
bool is_neg = (a < 0) != (b < 0);