http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50693
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-10-10 22:55:07 UTC --- (In reply to comment #1) > It may be interesting to note that clang (version 2.9) does not exhibit this > performance difference, but versions execute quickly. Yes that really true because I thought LLVM does not have a vectorizer.