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Summary: If an induction variable is provably non-negative, its sign extension is equal to its zero extension. This means narrow uses like icmp slt iNarrow %indvar, %rhs can be widened into icmp slt iWide zext(%indvar), sext(%rhs) Reviewers: atrick, mcrosier, hfinkel Subscribers: hfinkel, reames, llvm-commits Differential Revision: http://reviews.llvm.org/D12745 llvm-svn: 248045
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