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Preserve the DominanceFrontier analysis in the LoopDeletion pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65359 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -53,6 +53,7 @@ namespace {
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AU.addPreserved<LoopInfo>();
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AU.addPreservedID(LoopSimplifyID);
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AU.addPreservedID(LCSSAID);
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AU.addPreserved<DominanceFrontier>();
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}
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};
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}
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@ -228,6 +229,7 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
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// Update the dominator tree and remove the instructions and blocks that will
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// be deleted from the reference counting scheme.
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DominatorTree& DT = getAnalysis<DominatorTree>();
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DominanceFrontier* DF = getAnalysisIfAvailable<DominanceFrontier>();
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SmallPtrSet<DomTreeNode*, 8> ChildNodes;
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for (Loop::block_iterator LI = L->block_begin(), LE = L->block_end();
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LI != LE; ++LI) {
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@ -235,12 +237,15 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
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// allows us to remove the domtree entry for the block.
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ChildNodes.insert(DT[*LI]->begin(), DT[*LI]->end());
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for (SmallPtrSet<DomTreeNode*, 8>::iterator DI = ChildNodes.begin(),
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DE = ChildNodes.end(); DI != DE; ++DI)
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DE = ChildNodes.end(); DI != DE; ++DI) {
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DT.changeImmediateDominator(*DI, DT[preheader]);
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if (DF) DF->changeImmediateDominator((*DI)->getBlock(), preheader, &DT);
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}
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ChildNodes.clear();
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DT.eraseNode(*LI);
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if (DF) DF->removeBlock(*LI);
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// Remove instructions that we're deleting from ScalarEvolution.
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for (BasicBlock::iterator BI = (*LI)->begin(), BE = (*LI)->end();
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BI != BE; ++BI)
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