| 49 | } |
| 50 | |
| 51 | bool SubInt63Overflow(int64_t a, int64_t b, int64_t &result) { |
| 52 | #if HAVE_DECL___BUILTIN_SSUBLL_OVERFLOW |
| 53 | if (__builtin_ssubll_overflow(a, b, (long long int *)&result)) { |
| 54 | return true; |
| 55 | } |
| 56 | return result == std::numeric_limits<int64_t>::min(); |
| 57 | #else |
| 58 | return SubInt63OverflowEmulated(a, b, result); |
| 59 | #endif |
| 60 | } |