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Summary: Teach SCEV to prove no overflow for an add recurrence by proving something about the range of another add recurrence a loop-invariant distance away from it. Reviewers: atrick, hfinkel Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D7980 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231305 91177308-0d34-0410-b5e6-96231b3b80d8
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