[Bug tree-optimization/82387] [8 Regression] wrong code at -O1 and -Os on x86_64-linux-gnu in 64-bit mode

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82387

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42278
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42278&action=edit
gcc8-pr82387.patch

Untested fix.