[Bug tree-optimization/126689] Missed removal of nested copysigns

"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=126689

--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> A backprop thing?

Yes backprop can be taught that copysign's first argument does not care about
sign. And that copysign touches the sign.
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