[Bug tree-optimization/123330] Optimization fails with standard branchless idiom with power of 2s

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123330

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Tobias Schlüter from comment #2)
> Sure, I meant "undefined on the hardware level."  I hope you're not saying
> that the optimizers go crazy when using __builtin_clz(0) even when using
> -mlzcnt?


No it is undefined at the source level too.