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Fix a crashing bug in SplitBlock when it is called on a block with no

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dominator information even though dominators were previously computed.

Patch by Nick Sumner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138449 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2011-08-24 18:07:01 +00:00
parent c7e0bb2325
commit 605e2b5184
1 changed files with 6 additions and 5 deletions
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3
lib/Transforms/Utils/BasicBlockUtils.cpp
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@@ -299,7 +299,7 @@ BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
if (DominatorTree *DT = P->getAnalysisIfAvailable<DominatorTree>()) {
// Old dominates New. New node dominates all other nodes dominated by Old.
DomTreeNode *OldNode = DT->getNode(Old);
if (DomTreeNode *OldNode = DT->getNode(Old)) {
std::vector<DomTreeNode *> Children;
for (DomTreeNode::iterator I = OldNode->begin(), E = OldNode->end();
I != E; ++I)
@@ -310,6 +310,7 @@ BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
E = Children.end(); I != E; ++I)
DT->changeImmediateDominator(*I, NewNode);
}
}
return New;
}