[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 #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43628
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43628&action=edit
gcc8-pr84786.patch

Untested fix.