[Bug tree-optimization/126763] a?__builtin_clz(a):__builtin_clz(31) -> clz(a|1)
"pinskia at gcc dot gnu.org via Gcc-bugs" <[email protected]>
| Newsgroups | gmane.comp.gcc.bugs |
|---|---|
| Message-ID | <[email protected]/bugzilla/> |
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126763
--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Seems like we could the a|CST trick even for this:
```
int gg(unsigned a)
{
if (a>=3)
return __builtin_clz(a);
return __builtin_clz(3);
}
int gg0(unsigned a)
{
return __builtin_clz(a|3);
}
```