https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99133
--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> --- Note, the comment should read: Note unlike the load/store/paddi instructions, these prefixed instructions do NOT have a 'p' prefix, which means the code in rs6000_final_prescan_insn will have to be modified so it does not add a 'p' for these cases.