[Bug target/94789] Failure to take advantage of shift operand semantics to turn subtraction into negate

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94789

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2020-04-27
     Ever confirmed|0                           |1
             Target|                            |x86_64-*-* i?86-*-*
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
          Component|tree-optimization           |target

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, that looks target dependent to me.  We'd take advanage of the targts
handling of out-of-bound shift operands?