[Bug tree-optimization/95862] Failure to optimize usage of __builtin_mul_overflow to small __int128-based check

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95862

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Are you specifically talking about the case where r is unused afterwards, aka
about return __builtin_mul_overflow_p (a, b, (uint64_t) 0); ?
In that case, the overflow is only if a and b have different signs, aka.
(a ^ b) < 0.