[Bug tree-optimization/78720] [7 Regression] Illegal instruction in generated code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78720

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 40284
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40284&action=edit
gcc7-pr78720.patch

Untested fix.