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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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14
lib/Transforms/Scalar/LoopRotation.cpp
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@@ -511,10 +511,14 @@ void LoopRotate::preserveCanonicalLoopForm(LPPassManager &LPM) {
DF->addBasicBlock(L->getHeader(), LatchSet); DF->addBasicBlock(L->getHeader(), LatchSet);
} }
// If a loop block dominates new loop latch then its frontier is // If a loop block dominates new loop latch then add to its frontiers
// new header and Exit. // new header and Exit and remove new latch (which is equal to original
// header).
BasicBlock *NewLatch = L->getLoopLatch(); BasicBlock *NewLatch = L->getLoopLatch();
DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>();
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(); for (Loop::block_iterator BI = L->block_begin(), BE = L->block_end();
BI != BE; ++BI) { BI != BE; ++BI) {
BasicBlock *B = *BI; BasicBlock *B = *BI;
@@ -522,8 +526,7 @@ void LoopRotate::preserveCanonicalLoopForm(LPPassManager &LPM) {
DominanceFrontier::iterator BDFI = DF->find(B); DominanceFrontier::iterator BDFI = DF->find(B);
if (BDFI != DF->end()) { if (BDFI != DF->end()) {
DominanceFrontier::DomSetType &BSet = BDFI->second; DominanceFrontier::DomSetType &BSet = BDFI->second;
BSet = BDFI->second; BSet.erase(NewLatch);
BSet.clear();
BSet.insert(L->getHeader()); BSet.insert(L->getHeader());
BSet.insert(Exit); BSet.insert(Exit);
} else { } else {
@@ -535,6 +538,7 @@ void LoopRotate::preserveCanonicalLoopForm(LPPassManager &LPM) {
} }
} }
} }
}
// Preserve canonical loop form, which means Exit block should // Preserve canonical loop form, which means Exit block should
// have only one predecessor. // have only one predecessor.