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Fix a bug where we'd call SplitBlockPredecessors with a pred in the

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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
This commit is contained in:
Chris Lattner 2009-11-06 23:19:58 +00:00
parent d51722a7e3
commit 79f0332c20
1 changed files with 11 additions and 2 deletions
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13
lib/Transforms/Scalar/JumpThreading.cpp
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@ -940,8 +940,17 @@ bool JumpThreading::ProcessThreadableEdges(Instruction *CondInst,
// predecessors that will jump to it into a single predecessor.
SmallVector<BasicBlock*, 16> PredsToFactor;
for (unsigned i = 0, e = PredToDestList.size(); i != e; ++i)
if (PredToDestList[i].second == MostPopularDest)
PredsToFactor.push_back(PredToDestList[i].first);
if (PredToDestList[i].second == MostPopularDest) {
BasicBlock *Pred = PredToDestList[i].first;
// This predecessor may be a switch or something else that has multiple
// edges to the block. Factor each of these edges by listing them
// according to # occurrences in PredsToFactor.
TerminatorInst *PredTI = Pred->getTerminator();
for (unsigned i = 0, e = PredTI->getNumSuccessors(); i != e; ++i)
if (PredTI->getSuccessor(i) == BB)
PredsToFactor.push_back(Pred);
}
BasicBlock *PredToThread;
if (PredsToFactor.size() == 1)