https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96482
--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> --- that patch makes ccp to actually use the bit info ipa-cp determines. Before we used it only to detect pointer alignments if I remember correctly. So it looks like propagation bug uncovered by the change. Smaller testcase or reproduction steps would be indeed welcome.
