[Bug tree-optimization/125517] Wrong code for __builtin_bitreverse128

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125517

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |pinskia at gcc dot gnu.org
   Last reconfirmed|                            |2026-05-31
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
It is even worse than that:
```
unsigned __int128
foo2 (unsigned __int128 a)
{
  return __builtin_bitreverse128 (0xA0000A0000ULL);
}
```

Returns 0 which is wrong.