https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39305
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A slightly different but better patch was done for GCC 9. r9-4967 .
r9-4967 checks if the exit was an IV which is very similar to what your check
was trying to do.