[Bug middle-end/80100] simplify-rtx.c sanitizer detects undefined behaviour with optimization

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80100

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 41177
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41177&action=edit
gcc7-pr80100.patch

Untested fix.