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Fix a bug where we'd call SplitBlockPredecessors with a pred in the
set only once even if it has multiple edges to BB. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86299 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -940,8 +940,17 @@ bool JumpThreading::ProcessThreadableEdges(Instruction *CondInst,
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// predecessors that will jump to it into a single predecessor.
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SmallVector<BasicBlock*, 16> PredsToFactor;
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for (unsigned i = 0, e = PredToDestList.size(); i != e; ++i)
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if (PredToDestList[i].second == MostPopularDest)
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PredsToFactor.push_back(PredToDestList[i].first);
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if (PredToDestList[i].second == MostPopularDest) {
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BasicBlock *Pred = PredToDestList[i].first;
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// This predecessor may be a switch or something else that has multiple
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// edges to the block. Factor each of these edges by listing them
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// according to # occurrences in PredsToFactor.
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TerminatorInst *PredTI = Pred->getTerminator();
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for (unsigned i = 0, e = PredTI->getNumSuccessors(); i != e; ++i)
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if (PredTI->getSuccessor(i) == BB)
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PredsToFactor.push_back(Pred);
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}
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BasicBlock *PredToThread;
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if (PredsToFactor.size() == 1)
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