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After a basic block is split into two parts,

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second part dominates all the blocks dominated
by original basic block. And first part dominates
second part.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40035 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-07-19 02:29:24 +00:00
parent 72ea8d9060
commit a8a8a36629
1 changed files with 15 additions and 2 deletions
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17
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -165,8 +165,21 @@ BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
if (Loop *L = LI.getLoopFor(Old))
L->addBasicBlockToLoop(New, LI);
if (DominatorTree *DT = P->getAnalysisToUpdate<DominatorTree>())
DT->addNewBlock(New, Old);
if (DominatorTree *DT = P->getAnalysisToUpdate<DominatorTree>())
{
// Old dominates New. New node domiantes all other nodes dominated by Old.
DomTreeNode *OldNode = DT->getNode(Old);
std::vector<DomTreeNode *> Children;
for (DomTreeNode::iterator I = OldNode->begin(), E = OldNode->end();
I != E; ++I)
Children.push_back(*I);
DomTreeNode *NewNode = DT->addNewBlock(New,Old);
for (std::vector<DomTreeNode *>::iterator I = Children.begin(),
E = Children.end(); I != E; ++I)
DT->changeImmediateDominator(*I, NewNode);
}
if (DominanceFrontier *DF = P->getAnalysisToUpdate<DominanceFrontier>())
DF->splitBlock(Old);