[Bug tree-optimization/121006] if (float_var == CST || float_var== -CST) is known to be true, __builtin_copysignf(CST, float_var) can be optimized to just float_var

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121006

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Confirmed, but does this happen in practice?

The zero case might happen the most. Otherwise I doubt very much