See PR37742 and PR37955.
-- Summary: vectorization breaks type-based aliasing rules Product: gcc Version: 4.4.0 Status: UNCONFIRMED Keywords: wrong-code, alias Severity: normal Priority: P3 Component: tree-optimization AssignedTo: rguenth at gcc dot gnu dot org ReportedBy: rguenth at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38301