http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49923
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-08-02 13:11:40 UTC --- It's easy - misaligned accesses on strict-align targets are a PITA. IPA-SRA needs similar adjustments as scalar SRA to keep memory references in the component-ref style form which is the only one that the expander "properly" handles.