[Bug target/85177] [8 Regression] wrong code with -O -fno-tree-ccp -fno-tree-sra -mavx512f

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85177

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43827
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43827&action=edit
gcc8-pr85177.patch

Untested fix.