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vectorizer, placing it behind an off-by-default flag. It turns out that block frequency isn't what we want at all, here or elsewhere. This has been I think a nagging feeling for several of us working with it, but Arnold has given some really nice simple examples where the results are so comprehensively wrong that they aren't useful. I'm planning to email the dev list with a summary of why its not really useful and a couple of ideas about how to better structure these types of heuristics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200294 91177308-0d34-0410-b5e6-96231b3b80d8
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