[Bug c++/110679] New: Missed optimization opportunity with countr_zero

[denis.yaroshevskij at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110679

            Bug ID: 110679
           Summary: Missed optimization opportunity with countr_zero
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: denis.yaroshevskij at gmail dot com
  Target Milestone: ---

Clang better optimizes the following code:

```
int tst(std::uint8_t x) {
  if (!x) return 8;
  return std::countr_zero(x);
}
```

https://godbolt.org/z/dqr5Eddn4