[Bug tree-optimization/93744] [8/9/10 Regression] Different results between gcc-9 and gcc-7

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93744

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47844
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47844&action=edit
gcc10-pr93744.patch

Untested fix.  I'd say issues with that pattern unrelated to side-effects
should be tracked independently.