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

[ubizjak at gmail dot com via Gcc-bugs]

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

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
... or perhaps a target hook that specifies extra registers, clobbered by
function.