[Bug middle-end/118172] New: memchr with a small constant size could be inlined

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118172

            Bug ID: 118172
           Summary: memchr with a small constant size could be inlined
           Product: gcc
           Version: 14.2.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
void* test1(char* first, char val) {
  return __builtin_memchr(first, val, 2);
}
```

This could be optimized to `return first[0] == val || first[1] == val;` (with a
branch even).