[Bug tree-optimization/126646] New: Umin(a,1) | umin(b,1) ->umin(a|b, 1)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126646

            Bug ID: 126646
           Summary: Umin(a,1) | umin(b,1) ->umin(a|b, 1)
           Product: gcc
           Version: 17.0
            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
  Target Milestone: ---

Take:
```
unsigned f(unsigned a, unsigned b)
{
    unsigned t = 1;
    a = a < t ? a : t;
    b = b < t ? b : t;
    return a | b;
}
```

This should be reduced to just:
```
unsigned f1(unsigned a, unsigned b)
{
    unsigned t = 1;
    a = a|b;
    return a < t ? a : t;
}
```

Note the use of t here is to get MIN_EXPR rather than `!= 0` which shows up due
to early folding.