[Bug tree-optimization/118805] [15 Regression] wrong code at -O1 with "-fno-tree-ccp -fno-tree-copy-prop -fno-tree-forwprop -fno-tree-fre" on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118805

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2025-02-09
     Ever confirmed|0                           |1
                 CC|                            |aoliva at gcc dot gnu.org

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

Before ifcombine:
```
  a.0_1 = a;
  t_4 = (int) a.0_1;
  if (t_4 < 0)
    goto <bb 3>; [41.00%]
  else
    goto <bb 5>; [59.00%]

  <bb 3> [local count: 440234144]:
  a.1_2 = a;
  if (a.1_2 == 255)
    goto <bb 4>; [0.00%]
  else
    goto <bb 5>; [100.00%]

```

After:
```
optimizing two comparisons to a.0_1 == 255
...
  a.0_1 = a;
  t_4 = (int) a.0_1;
  a.1_2 = a;
  if (a.0_1 == 255)
    goto <bb 3>; [0.00%]
  else
    goto <bb 4>; [100.00%]
```