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5de9960136
Summary: There are several unhandled edge cases in BasicAA's GetLinearExpression method. This changes fixes outstanding issues, including zext / sext of a constant with the sign bit set, and the refusal to decompose zexts or sexts of wrapping arithmetic. Test Plan: Unit tests added in //q.ext.ll//. Patch by Nick White. Reviewers: hfinkel, sanjoy Reviewed By: hfinkel, sanjoy Subscribers: sanjoy, llvm-commits, hfinkel Differential Revision: http://reviews.llvm.org/D6682 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236894 91177308-0d34-0410-b5e6-96231b3b80d8
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