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19ce959014
To avoid regressions, make ScalarEvolution::createSCEV a bit more clever. Also get rid of some useless code in ScalarEvolution::howFarToZero which was hiding this bug. No new testcase because it's impossible to actually expose this bug: we don't have any in-tree users of getUDivExactExpr besides the two functions I just mentioned, and they both dodged the problem. I'll try to add some interesting users in a followup. Differential Revision: https://reviews.llvm.org/D28587 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292449 91177308-0d34-0410-b5e6-96231b3b80d8
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