http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48124
--- Comment #14 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-02-01 14:17:05 UTC --- I remember (bug number?) we have the same issue with multi-word accesses where the last part uses word_mode (all other pieces as well, of course) and that accesses the object out-of-bounds.
