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Expunge DomSet from BreakCriticalEdges. This is part of the continuing

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work for PR 1171.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35728 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-04-07 05:49:29 +00:00
parent ee2b32082e
commit 2d43519454
1 changed files with 18 additions and 52 deletions
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70
lib/Transforms/Utils/BreakCriticalEdges.cpp
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@ -38,9 +38,7 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<ETForest>();
AU.addPreserved<DominatorSet>();
AU.addPreserved<ImmediateDominators>();
AU.addPreserved<DominatorTree>();
AU.addPreserved<DominanceFrontier>();
AU.addPreserved<LoopInfo>();
@ -108,7 +106,7 @@ bool llvm::isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
}
// SplitCriticalEdge - If this edge is a critical edge, insert a new node to
// split the critical edge. This will update DominatorSet, ImmediateDominator,
// split the critical edge. This will update ETForest, ImmediateDominator,
// DominatorTree, and DominatorFrontier information if it is available, thus
// calling this pass will not invalidate any of them. This returns true if
// the edge was split, false otherwise. This ensures that all edges to that
@ -176,38 +174,26 @@ bool llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P,
if (*I != NewBB)
OtherPreds.push_back(*I);
// NewBBDominatesDestBB is valid if OtherPreds is empty, otherwise it isn't
// yet computed.
bool NewBBDominatesDestBB = true;
// Should we update DominatorSet information?
if (DominatorSet *DS = P->getAnalysisToUpdate<DominatorSet>()) {
DominatorSet::iterator DSI = DS->find(TIBB);
if (DSI != DS->end()) { // TIBB is reachable?
// The blocks that dominate the new one are the blocks that dominate TIBB
// plus the new block itself.
DominatorSet::DomSetType DomSet = DSI->second; // Copy domset.
DomSet.insert(NewBB); // A block always dominates itself.
DS->addBasicBlock(NewBB, DomSet);
// If NewBBDominatesDestBB hasn't been computed yet, do so with DS.
if (!OtherPreds.empty()) {
while (!OtherPreds.empty() && NewBBDominatesDestBB) {
NewBBDominatesDestBB = DS->dominates(DestBB, OtherPreds.back());
OtherPreds.pop_back();
}
OtherPreds.clear();
}
// If NewBBDominatesDestBB, then NewBB dominates DestBB, otherwise it
// doesn't dominate anything. If NewBB does dominates DestBB, then it
// dominates everything that DestBB dominates.
if (NewBBDominatesDestBB) {
for (DominatorSet::iterator I = DS->begin(), E = DS->end(); I != E; ++I)
if (I->second.count(DestBB))
I->second.insert(NewBB);
// Update the forest?
if (ETForest *EF = P->getAnalysisToUpdate<ETForest>()) {
// NewBB is dominated by TIBB.
EF->addNewBlock(NewBB, TIBB);
// If NewBBDominatesDestBB hasn't been computed yet, do so with EF.
if (!OtherPreds.empty()) {
while (!OtherPreds.empty() && NewBBDominatesDestBB) {
NewBBDominatesDestBB = EF->dominates(DestBB, OtherPreds.back());
OtherPreds.pop_back();
}
OtherPreds.clear();
}
// If NewBBDominatesDestBB, then NewBB dominates DestBB, otherwise it
// doesn't dominate anything.
if (NewBBDominatesDestBB)
EF->setImmediateDominator(DestBB, NewBB);
}
// Should we update ImmediateDominator information?
@ -232,27 +218,7 @@ bool llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P,
ID->setImmediateDominator(DestBB, NewBB);
}
}
// Update the forest?
if (ETForest *EF = P->getAnalysisToUpdate<ETForest>()) {
// NewBB is dominated by TIBB.
EF->addNewBlock(NewBB, TIBB);
// If NewBBDominatesDestBB hasn't been computed yet, do so with EF.
if (!OtherPreds.empty()) {
while (!OtherPreds.empty() && NewBBDominatesDestBB) {
NewBBDominatesDestBB = EF->dominates(DestBB, OtherPreds.back());
OtherPreds.pop_back();
}
OtherPreds.clear();
}
// If NewBBDominatesDestBB, then NewBB dominates DestBB, otherwise it
// doesn't dominate anything.
if (NewBBDominatesDestBB)
EF->setImmediateDominator(DestBB, NewBB);
}
// Should we update DominatorTree information?
if (DominatorTree *DT = P->getAnalysisToUpdate<DominatorTree>()) {
DominatorTree::Node *TINode = DT->getNode(TIBB);