https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104961
--- Comment #2 from Vladimir Makarov <vmakarov at gcc dot gnu.org> --- I've reproduced the bug. The mentioned patch is not the cause but a trigger. The origin of the problem is actually a removal of hard reg propagation before RA which happened about year ago. I hope the fix will be ready on Friday or Monday.
