[Bug tree-optimization/115055] New: reassociation should use match-and-simplify

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115055

            Bug ID: 115055
           Summary: reassociation should use match-and-simplify
           Product: gcc
           Version: 15.0
            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 f(int a, int c)
{
        int b = a & c;
        return (a == 0) & b;
}
```

This should be optimized to 0 but currently does not. 

There is a match pattern (via PR 111431) which is able to handle `a & (a == 0)`
into `0`. reassociation knows how to handle `a & a` but it seems like if while
doing reassociation, we should be to try to use match-and-simplify to simplify
the f here.