https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154
--- Comment #26 from Richard Biener <rguenth at gcc dot gnu.org> --- This is the powers of simplify_subreg I guess. We're lucky it doesn't do this to arbitrary arithmetic. So we need to really change all defs we introduce to vector modes instead of making our live easy and using paradoxical subregs all over the place.
