[Bug tree-optimization/110982] (unsigned)(signed_char) != (unsigned)-1 is never changed back into signed_char != -1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110982

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-09-25

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Another case where int_fits_type_p use causes an missed optimization is:
```
unsigned f(int a)
{
        unsigned t = a;
        if (a == -1)
        return t;
        return 0;
}
```

This should be caught in phiopt2 but currently is not due to the
int_fits_type_p usage.

I noticed this in PR 110131 .