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Hi Tyler, Try adding -ffast-math. We can only vectorize reduction variables if it is safe to reorder floating point operations. Thanks, Nadav On Apr 3, 2013, at 10:29 AM, "Nowicki, Tyler" <tyler.nowicki at intel.com> wrote: > Hi, > > I have a question about LoopVectorize. I wrote a simple test case, a dot product loop and found that packed instructions are

...addq $4, %rdi mulss (%rsi), %xmm1 addq $4, %rsi decl %edx addss %xmm1, %xmm0 jne .LBB1_1 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130404/25c661a3/attachment.html>

Hi, I have a question about LoopVectorize. I wrote a simple test case, a dot product loop and found that packed instructions are generated when input arrays are integer, but not when they are float or double. If I modify the float example in http://llvm.org/docs/Vectorizers.html by adding restrict to the input arrays packed instructions are generated. Although it should not be required I tried