[Bug target/117169] Missed opportunity to combine sign and bitmask tests

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117169

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-10-16
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  I think there's both code in reassoc and match.pd to handle this,
eventually, if written

 if (x < 0)
   return 1;
 if (x & 3)
   return 1;

also in gimple-fold.cc maybe_fold_or_comparisons (though nowadays match.pd
is prefered).

Usually x < 0 "combines" better so it's chosen as canonical form.