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Fix a non-deterministic loop in llvm::MergeBlockIntoPredecessor. 

DT->changeImmediateDominator() trivially ignores identity updates, so there is
really no need for the uniqueing provided by SmallPtrSet.

I expect this to fix PR8954.

llvm-svn: 123286
This commit is contained in:
Jakob Stoklund Olesen 2011-01-11 22:54:38 +00:00
parent 8c98495f43
commit f2407aa98b
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -169,8 +169,8 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, Pass *P) {
if (DominatorTree *DT = P->getAnalysisIfAvailable<DominatorTree>()) {
if (DomTreeNode *DTN = DT->getNode(BB)) {
DomTreeNode *PredDTN = DT->getNode(PredBB);
SmallPtrSet<DomTreeNode*, 8> Children(DTN->begin(), DTN->end());
for (SmallPtrSet<DomTreeNode*, 8>::iterator DI = Children.begin(),
SmallVector<DomTreeNode*, 8> Children(DTN->begin(), DTN->end());
for (SmallVector<DomTreeNode*, 8>::iterator DI = Children.begin(),
DE = Children.end(); DI != DE; ++DI)
DT->changeImmediateDominator(*DI, PredDTN);