[Bug target/92140] clang vs gcc optimizing with adc/sbb

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92140

--- Comment #31 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #29)
> Does it help the i386 port if we disallow a hard reg dest as well?
> RA should be able to handle that just fine as well.

I tried this out, and it creates much worse code (much bigger, anyway),
on all targets.