[Bug tree-optimization/113176] New: `(n / 4) ? n / 4 : 0` is not optimized to just `n /4`

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113176

            Bug ID: 113176
           Summary: `(n / 4) ? n / 4 : 0` is not optimized to just `n /4`
           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 unopt(int n) {
    if (n / 4)
        return n / 4;
    else
        return 0;
}

int unopt1(int n) {
    return (n / 4) ? n / 4 : 0;
}

int opt(int n) {
    return n / 4;
}
```

I would have expected unopt be transformed into opt but currently it is not.

This is because GCC decides to transform `(n / 4) != 0` into `(unsigned int) n
+ 3 > 6`.