https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102974
--- Comment #6 from cqwrteur <unlvsur at live dot com> --- (In reply to Andrew Pinski from comment #5) > (In reply to cqwrteur from comment #4) > > (In reply to cqwrteur from comment #3) > > > (In reply to Andrew Pinski from comment #2) > > > > There might be another bug about _addcarryx_u64 already. > > > > > > This is 32 bit addcarry. > > > > but yeah. GCC does not perform optimizations very well to add carries and > > mul + recognize >>64u <<64u patterns > > I mean all of _addcarryx_* intrinsics. https://godbolt.org/z/qq3nb49Eq https://godbolt.org/z/cqoYG35jx Also this is weird. just extract part of code into function generates different assembly for __builtin_bit_cast. It must be a inliner bug.
