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9a08056433
Summary: This is the first patch for the loop guard. We introduced getLoopGuardBranch() and isGuarded(). This currently only works on simplified loop, as it requires a preheader and a latch to identify the guard. It will work on loops of the form: /// GuardBB: /// br cond1, Preheader, ExitSucc <== GuardBranch /// Preheader: /// br Header /// Header: /// ... /// br Latch /// Latch: /// br cond2, Header, ExitBlock /// ExitBlock: /// br ExitSucc /// ExitSucc: Prior discussions leading upto the decision to introduce the loop guard API: http://lists.llvm.org/pipermail/llvm-dev/2019-May/132607.html Reviewer: reames, kbarton, hfinkel, jdoerfert, Meinersbur, dmgreen Reviewed By: reames Subscribers: wuzish, hiraditya, jsji, llvm-commits, bmahjour, etiotto Tag: LLVM Differential Revision: https://reviews.llvm.org/D63885 llvm-svn: 367033 |
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