[Bug tree-optimization/119683] [13/14/15 Regression] recalculating the return value which was already in the register right before function return

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119683

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |13.4
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2025-04-08
            Summary|[13/14 Regression]          |[13/14/15 Regression]
                   |recalculating the return    |recalculating the return
                   |value which was already in  |value which was already in
                   |the register right before   |the register right before
                   |function return             |function return
          Component|middle-end                  |tree-optimization

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The difference is:
  _3 = (int) c_12(D);
  _4 = _3 + -48;
  _15 = (unsigned int) _4;

vs

  _26 = c_12(D) + -48;
  _15 = (unsigned int) _26;


The match pattern:
((T)(A)) + CST -> (T)(A + CST)

used to handle this. but for some reason it is not doing it any more ...