[Bug tree-optimization/96685] Failure to optimize not+sub to add+not

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96685

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 49742
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49742&action=edit
gcc11-pr96685.patch

Untested fix.