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Undo previous patch. It is not that simple to fix dom info here.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53062 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-07-03 00:08:13 +00:00
parent be04dc1413
commit 825cb98d9a
1 changed files with 2 additions and 16 deletions
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18
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -1204,32 +1204,18 @@ void LoopUnswitch::RewriteLoopBodyWithConditionConstant(Loop *L, Value *LIC,
// trying to update it is complicated. So instead we preserve the
// loop structure and put the block on an dead code path.
BasicBlock *SISucc = SI->getSuccessor(i);
BasicBlock* Old = SI->getParent();
BasicBlock* Split = SplitBlock(Old, SI, this);
Instruction* OldTerm = Old->getTerminator();
BranchInst::Create(Split, SISucc,
BranchInst::Create(Split, SI->getSuccessor(i),
ConstantInt::getTrue(), OldTerm);
if (DT) {
// Now, SISucc is dominated by Old.
DT->changeImmediateDominator(SISucc, Old);
if (DF) {
// Now, Split does not dominate SISucc.
// SISucc is the only member in Split's DF.
DominanceFrontier::iterator S_DFI = DF->find(Split);
if (S_DFI != DF->end())
S_DFI->second.clear();
addBBToDomFrontier(*DF, S_DFI, Split, SISucc);
}
}
LPM->deleteSimpleAnalysisValue(Old->getTerminator(), L);
Old->getTerminator()->eraseFromParent();
PHINode *PN;
for (BasicBlock::iterator II = SISucc->begin();
for (BasicBlock::iterator II = SI->getSuccessor(i)->begin();
(PN = dyn_cast<PHINode>(II)); ++II) {
Value *InVal = PN->removeIncomingValue(Split, false);
PN->addIncoming(InVal, Old);