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When creating a scev for sext({X,+,Y}), scev checks if the expression is equivalent to {sext X,+,zext Y}. If it can prove that, it also tags the original {X,+,Y} as <nsw>, which is not correct. In the test case I run `-scalar-evolution` twice because the bug manifests only once SCEV has run through and seen the `sext` expressions (and then does a in-place mutation on {X,+,Y}). Differential Revision: http://reviews.llvm.org/D7495 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228586 91177308-0d34-0410-b5e6-96231b3b80d8 |
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