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...oops"? I was talking about perfect nests. I'm talking about perfect loop nests, as in the classical fortran loop transformation sense. -Chris -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130731/672d7c62/attachment.html>

On 7/30/2013 11:44 PM, Chris Lattner wrote: > > The canonical form should be that loop invariants are hoisted. The canonical form should not depend on the knowledge as to what is invariant and what isn't. It has more to do with preserving certain "common" properties of a loop, such as header, preheader, latch branch, etc. > Optimizations should not depend on perfect