[Bug target/84786] [miscompilation] vunpcklpd accessing xmm16-22 targeting KNL

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84786

--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44312
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44312&action=edit
gcc7-pr84786.patch

Patch I'm going to bootstrap/regtest on 7.x branch now.
On the trunk/in 8.x this got fixed with r253924 aka one of the PR82370 fixes,
but that is something that IMHO shouldn't be backported.