[Bug rtl-optimization/68721] [6 Regression] wrong code at -Os and above on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68721

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 36960
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36960&action=edit
untested fix