[Bug tree-optimization/77647] Missed opportunity to use register value causes additional load

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77647

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-09-19
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In the case of -, during VPR (or DOM), folds the - to 0.  While in the + case,
it does not pick up it should be a + a instead of a + b.

Confirmed.