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Hi Javed, Developing a good loop vectorizer takes several years. The work on the GCC vectorizer began in 2004, and they spent several years improving and optimizing their vectorizer. They started by vectorizing simple loops, and added features that they needed in order to vectorize additional loops that were important for them. They started with a single-block loops, and later they added

...pointed out, as a first step a vectorizer will probably focus on very simple loops. Polly can obviously also help to vectorize them, but Polly may or may not be too much overhead for such simple cases. I think Sebastian Pop actually tested Polly on the gcc vectorizer test cases. He might be on vacaction now, but it would be interesting to get his results. As the design of the vectorizer is a very hot topic, I was wondering if there will be a BoF session on the LLVM conference? Nadav, you have not proposed one by accident? Tobi

Hi Nadav (and others who are related to this issue) - I saw some discussions on loop vectorizer that you are planning to write. Do you foresee using Polyhedral Framework (polly project) in some way in that. Thanks J. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121007/476abc1c/attachment.html>