https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92656
--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> --- The whole reg_stat thing cannot ever reliably track known bits. We need some other mechanism to do this, something that *is* reliable, and does not give different results if you try combinations in a different order. Something quite like dataflow. This then could also be used in other passes, of course.
