https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67211
--- Comment #9 from Michael Meissner <meissner at gcc dot gnu.org> --- Created attachment 36217 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36217&action=edit Proposed patch to fix the problem This patch makes -mefficient-unaligned-vsx set on -mcpu=power8 instead of -mtune=power8.