[Bug tree-optimization/86927] [8/9 Regression] Gcc miscompiles at -O3 on valid code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86927

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44607
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44607&action=edit
patch

I am testing the attached.