[Bug tree-optimization/87546] [9 Regression] Gcc miscompiles at -O3 on valid code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87546

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45026
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45026&action=edit
gcc9-pr87546.patch

Untested fix.