[Bug rtl-optimization/31485] C complex numbers, amd64 SSE, missed optimization opportunity

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31485

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Joel Yliluoma from comment #15)
> (In reply to Richard Biener from comment #14)
> > I also think llvms code generation is bogus since it appears the ABI
> > does not guarantee zeroed upper elements of the xmm0 argument
> > which means they could contain sNaNs:
> 
> Why would it matter that the unused portions of the register contain NaNs?

Because it could then raise exceptions that shouldn't be raised?