[Bug tree-optimization/121004] float_var*0.0f if we know a is either -0.0 or 0.0 can be just done as copysign(0.0, a)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121004

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> I am not 100% sure if this happens in PR 120996 but there is a possibility.

It does seem like it is happening there for LLVM code generation but I have not
looked at the LLVM bitcode ...