[Bug target/127773] [x86] vzeroupper missing before call to IPA-RA-known non-AVX callee, causing SSE/AVX transition assists

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127773

--- Comment #7 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to Hongtao Liu from comment #6)
> >Possible fix: return AVX_U128_CLEAN when no 256/512-bit value is live across 
> >the >call, or when the callee is known to be compiled without AVX.
> 
> Yes, that could be a solution.
> 

But it becomes complex when callee have it's own callees, uros's suggestion
could be a cleaner solution to hanlde the issue in IPA-RA.