[Bug tree-optimization/122616] New: `x&1 ? (x-1): (x|1)` -> x^1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122616

            Bug ID: 122616
           Summary: `x&1 ? (x-1): (x|1)` -> x^1
           Product: gcc
           Version: 16.0
            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: ---

```
int f1(int x)
{
  return x&1 ? (x-1): (x|1);
}
```

Should optimize to x^1.

This shows up in Linux kernel in nhmex_rbox_hw_config.