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Summary: PR24757 was caused by some incorect math in `ScalarEvolution::HowFarToZero` -- the smallest unsigned solution for X in 2^N * A = 2^N * X is not necessarily A. Reviewers: atrick, majnemer, meheff Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D12721 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247242 91177308-0d34-0410-b5e6-96231b3b80d8
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