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a43b643107
Summary: If the trip count of a specific backedge is `N`, then we know that backedge is effectively guarded by the condition `{0,+,1} u< N`. This change teaches SCEV to use this condition to prove things in `isLoopBackedgeGuardedByCond`. Depends on D12948 Depends on D12949 The original checkin, r248608 had to be backed out due to an issue with a ObjCXX unit test. That issue is now fixed, so re-landing. Reviewers: atrick, reames, majnemer, hfinkel Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D12950 llvm-svn: 248638 |
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