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Clarify that duplicate edges are not allowed in the Machine CFG.
LLVM IR has labeled duplicate CFG edges, but since Machine CFG edges don't have labels, it doesn't make sense to allow duplicates. There is no way of telling what the edges mean. Duplicate CFG edges cause confusion when dealing with edge weights. It seems that code producing duplicate CFG edges usually does the wrong thing with edge weights. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162227 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -351,6 +351,8 @@ public:
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/// parameter is stored in Weights list and it may be used by
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/// MachineBranchProbabilityInfo analysis to calculate branch probability.
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///
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/// Note that duplicate Machine CFG edges are not allowed.
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///
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void addSuccessor(MachineBasicBlock *succ, uint32_t weight = 0);
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/// removeSuccessor - Remove successor from the successors list of this
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