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Fix dom frontier update. This fixes PR4667.

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Patch by Jakub Staszak.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78388 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-08-07 17:16:44 +00:00
parent bdab0e9695
commit b7f40c1a2a
1 changed files with 23 additions and 19 deletions
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42
lib/Transforms/Scalar/LoopRotation.cpp
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@ -511,26 +511,30 @@ void LoopRotate::preserveCanonicalLoopForm(LPPassManager &LPM) {
DF->addBasicBlock(L->getHeader(), LatchSet);
}
// If a loop block dominates new loop latch then its frontier is
// new header and Exit.
// If a loop block dominates new loop latch then add to its frontiers
// new header and Exit and remove new latch (which is equal to original
// header).
BasicBlock *NewLatch = L->getLoopLatch();
DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>();
for (Loop::block_iterator BI = L->block_begin(), BE = L->block_end();
BI != BE; ++BI) {
BasicBlock *B = *BI;
if (DT->dominates(B, NewLatch)) {
DominanceFrontier::iterator BDFI = DF->find(B);
if (BDFI != DF->end()) {
DominanceFrontier::DomSetType &BSet = BDFI->second;
BSet = BDFI->second;
BSet.clear();
BSet.insert(L->getHeader());
BSet.insert(Exit);
} else {
DominanceFrontier::DomSetType BSet;
BSet.insert(L->getHeader());
BSet.insert(Exit);
DF->addBasicBlock(B, BSet);
assert(NewLatch == OrigHeader && "NewLatch is inequal to OrigHeader");
if (DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>()) {
for (Loop::block_iterator BI = L->block_begin(), BE = L->block_end();
BI != BE; ++BI) {
BasicBlock *B = *BI;
if (DT->dominates(B, NewLatch)) {
DominanceFrontier::iterator BDFI = DF->find(B);
if (BDFI != DF->end()) {
DominanceFrontier::DomSetType &BSet = BDFI->second;
BSet.erase(NewLatch);
BSet.insert(L->getHeader());
BSet.insert(Exit);
} else {
DominanceFrontier::DomSetType BSet;
BSet.insert(L->getHeader());
BSet.insert(Exit);
DF->addBasicBlock(B, BSet);
}
}
}
}