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I tried the following on the hand-unrolled loop: const std::uint64_t ir0 = i*8+0; // working const std::uint64_t ir0 = i%4+0; // working const std::uint64_t ir0 = (i+0)%4; // not working '+0' means +1,+2,+3 in the unrolled iterations. 'Working' means the SLP vectorizer succeeded. Thus, when working 'towards' the correct index function, auto

On Oct 30, 2013, at 6:10 PM, Frank Winter <fwinter at jlab.org> wrote: > the only option I see is to unroll the loop by hand. Since the array access is consecutive over 4 loop iterations I gave it a try and unrolled the loop by a factor of 4. Which gives the following array accesses: > > loop iter 0: > index_0 = 0 index_1 = 4 > index_0 = 1 index_1 = 5 > index_0 = 2

...4; // not working > I thought this would be the case when I saw the original expression. Maybe we need to teach module arithmetic to SCEV? --renato -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20131030/b68fbb14/attachment.html>