[Bug tree-optimization/94274] fold phi whose incoming args are defined from binary operations

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94274

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2020-03-23

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that with binary operations you are eventually increasing register
pressure up to a point where we need to spill so IMHO this should be only done
if both
blocks become empty after the transform.