[Bug target/102974] GCC optimization is very poor for add carry and multiplication combos

[unlvsur at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102974

--- Comment #4 from cqwrteur <unlvsur at live dot com> ---
(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