http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309
--- Comment #41 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-12 14:11:28 UTC --- That is definitely stage1 material, and a lot of work, especially to teach the vectorizer how to deal with these. And, we don't want to introduce the asan instrumentation too late, e.g. vectorization often reads even from memory outside of what the source code actually accesses, when it e.g. knows it is sufficiently aligned and won't cause crashes. That would be false positives for asan.
