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We handled all of the commuted variants for plain xor already, although they were scattered around and sometimes folded less efficiently using distributive laws. We had no folds for not-xor. Handling all of these patterns consistently is part of trying to reinstate: https://reviews.llvm.org/rL300977 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301144 91177308-0d34-0410-b5e6-96231b3b80d8
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