[Bug tree-optimization/123123] New: `a != 0 ? 1 : a + 1` is not always optimized to 1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123123

            Bug ID: 123123
           Summary: `a != 0 ? 1 : a + 1` is not always optimized to 1
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 123122
  Target Milestone: ---

Take The following gimple testcase
```
int __GIMPLE
g(int a)
{
  int t;
  int g;
  int tt1;
  bool b;
  t = 1;
  g = 0;
  b = a != 0;
  tt1 = a + 1;
  t = b ? t : tt1;
  return t;
}
```

This should just optimize to `return 1`.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123122
[Bug 123122] missed optimization for branch merging