[Bug target/99620] Subtract with borrow (SBB) missed optimization

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99620

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
      Known to fail|                            |11.0
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-03-17

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  For sub_good we detect .SUB_OVERFLOW while for sub_bad we do not.