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Diffstat (limited to 'lib/Transforms/Utils/SimplifyCFG.cpp')
| -rw-r--r-- | lib/Transforms/Utils/SimplifyCFG.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp index f924eebb0d..8b81555bc5 100644 --- a/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/lib/Transforms/Utils/SimplifyCFG.cpp @@ -1598,13 +1598,15 @@ static bool SimplifyCondBranchToCondBranch(BranchInst *PBI, BranchInst *BI) { // in the constant and simplify the block result. Subsequent passes of // simplifycfg will thread the block. if (BlockIsSimpleEnoughToThreadThrough(BB)) { + pred_iterator PB = pred_begin(BB), PE = pred_end(BB); PHINode *NewPN = PHINode::Create(Type::getInt1Ty(BB->getContext()), BI->getCondition()->getName() + ".pr", BB->begin()); + NewPN->reserveOperandSpace(std::distance(PB, PE)); // Okay, we're going to insert the PHI node. Since PBI is not the only // predecessor, compute the PHI'd conditional value for all of the preds. // Any predecessor where the condition is not computable we keep symbolic. - for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) { + for (pred_iterator PI = PB; PI != PE; ++PI) { BasicBlock *P = *PI; if ((PBI = dyn_cast<BranchInst>(P->getTerminator())) && PBI != BI && PBI->isConditional() && |