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Hi Josh, Your modules does not have a triple, so the target machine and TargetTransformInfo have no way of knowing if you are running on a machine with vector registers. Try adding the '-mcpu=XXXX' to opt and see what happens. Thanks, Nadav On May 9, 2013, at 1:42 PM, Josh Klontz <josh.klontz at gmail.com> wrote: > Hi! I am trying to get the loop vectorizer to work on a

Hi! I am trying to get the loop vectorizer to work on a simple example (http://pastebin.com/tGhpc4y0) that doubles every element in a vector. I've found that 'opt -loop-vectorize -force-vector-width=4 -S -debug double.ll' works as expected. However, removing the -force-vector-width flag results in no vectorization. From the debug output I can see that the issue boils down to: LV: The

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