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Thanks, that did it! Are there any plans to enable the loop vectorizer by default? From: Nadav Rotem [mailto:nrotem at apple.com] Sent: Wednesday, April 03, 2013 13:33 PM To: Nowicki, Tyler Cc: LLVM Developers Mailing List Subject: Re: Packed instructions generaetd by LoopVectorize? Hi Tyler, Try adding -ffast-math. We can only vectorize reduction variables if it is safe to reorder floating