https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94238
--- Comment #3 from Jeffrey A. Law <law at redhat dot com> --- Got it. simplify-rtx does not validate that a comparison opcode it simplifies to is valid for the mode. Fixing looks trivial. Unfortunately something happened overnight that is causing regressions all over the tester, so I want to fix that first, then throw my simpify-rtx fix into the tester. Regardless, I'll own this. Essentially it has (ior (lt (...)) (gt (...)) and simplifies that to (ltgt (...)) which isn't valid for integer or vector modes.