https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99620
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah. If you write it explicitly as:
auto sub_good(u128 a, u128 b)
{
u64 l;
bool k = __builtin_sub_overflow (a.l, b.l, &l);
auto h = a.h - b.h - k;
return u128{l, h};
}
it will be optimized too.
