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Remove ImmediateDominator analysis. The same information can be obtained from DomTree. A lot of code for

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constructing ImmediateDominator is now folded into DomTree construction.

This is part of the ongoing work for PR217.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2007-04-15 08:47:27 +00:00
parent 2aabd0722d
commit 3dc6776b33
8 changed files with 136 additions and 348 deletions
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26
lib/Transforms/Utils/LoopSimplify.cpp
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@ -68,7 +68,6 @@ namespace {
AU.addRequired<ETForest>();
AU.addPreserved<LoopInfo>();
AU.addPreserved<ImmediateDominators>();
AU.addPreserved<ETForest>();
AU.addPreserved<DominatorTree>();
AU.addPreserved<DominanceFrontier>();
@ -749,31 +748,6 @@ void LoopSimplify::UpdateDomInfoForRevectoredPreds(BasicBlock *NewBB,
}
BasicBlock *NewBBIDom = 0;
// Update immediate dominator information if we have it.
if (ImmediateDominators *ID = getAnalysisToUpdate<ImmediateDominators>()) {
unsigned i = 0;
for (i = 0; i < PredBlocks.size(); ++i)
if (ETF.dominates(&PredBlocks[i]->getParent()->getEntryBlock(), PredBlocks[i])) {
NewBBIDom = PredBlocks[i];
break;
}
assert(i != PredBlocks.size() && "No reachable preds?");
for (i = i + 1; i < PredBlocks.size(); ++i) {
if (ETF.dominates(&PredBlocks[i]->getParent()->getEntryBlock(), PredBlocks[i]))
NewBBIDom = ETF.nearestCommonDominator(NewBBIDom, PredBlocks[i]);
}
assert(NewBBIDom && "No immediate dominator found??");
// Set the immediate dominator now...
ID->addNewBlock(NewBB, NewBBIDom);
// If NewBB strictly dominates other blocks, we need to update their idom's
// now. The only block that need adjustment is the NewBBSucc block, whose
// idom should currently be set to PredBlocks[0].
if (NewBBDominatesNewBBSucc)
ID->setImmediateDominator(NewBBSucc, NewBB);
}
// Update DominatorTree information if it is active.
if (DominatorTree *DT = getAnalysisToUpdate<DominatorTree>()) {