[Bug tree-optimization/111275] New: ifcombine and reassociation does not like to produce `a ^ b` sometimes

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111275

            Bug ID: 111275
           Summary: ifcombine and reassociation does not like to produce
                    `a ^ b` sometimes
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int f0(_Bool u, _Bool v)
{
  _Bool t1, t;
  t = !u & v;
  t1 = !v & u;
  if (t) goto L40;
  if (t1) goto L40;
  return 0;
L40:
  return 1;
}
int f1(_Bool u, _Bool v)
{
  _Bool t1, t;
  t = !u & v;
  if (t) goto L40;
  t1 = !v & u;
  if (t1) goto L40;
  return 0;
L40:
  return 1;
}
```

These 2 should just produce `return u ^ v;` (or `return u != v;`) but currently
only f0 does.