mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2026-07-15 11:35:42 +00:00
Code Activity

Handle ARM64EC in MSVC mul_overflows path

Browse source
This commit is contained in:
copilot-swe-agent[bot] 2026-07-15 05:37:58 +00:00 • committed by GitHub
parent b778291aae
commit a9725372a9
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/util/mpz.cpp
View file

@ -34,14 +34,14 @@ 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)
// MSVC _mul128 intrinsic is unavailable when targeting ARM64.
#elif defined(_MSC_VER) && !defined(_M_ARM64) && !defined(_M_ARM64EC)
// MSVC _mul128 is available on the non-ARM64 targets that still use this path.
__int64 high;
result = _mul128(a, b, &high);
// Overflow if high bits are not the sign extension of result
return high != (result < 0 ? -1 : 0);
#elif defined(_MSC_VER)
// `-(v + 1) + 1` computes |v| without ever evaluating -INT64_MIN.
// `-(v + 1) + 1` computes |v| even for INT64_MIN, where direct negation would overflow.
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);