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Preserve simple analysis.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41054 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -98,7 +98,7 @@ namespace {
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bool safeExitBlock(SplitInfo &SD, BasicBlock *BB);
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/// removeBlocks - Remove basic block BB and all blocks dominated by BB.
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void removeBlocks(BasicBlock *InBB);
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void removeBlocks(BasicBlock *InBB, Loop *LP);
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/// Find cost of spliting loop L.
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unsigned findSplitCost(Loop *L, SplitInfo &SD);
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@ -589,7 +589,7 @@ unsigned LoopIndexSplit::findSplitCost(Loop *L, SplitInfo &SD) {
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}
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/// removeBlocks - Remove basic block BB and all blocks dominated by BB.
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void LoopIndexSplit::removeBlocks(BasicBlock *InBB) {
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void LoopIndexSplit::removeBlocks(BasicBlock *InBB, Loop *LP) {
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SmallVector<std::pair<BasicBlock *, succ_iterator>, 8> WorkList;
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WorkList.push_back(std::make_pair(InBB, succ_begin(InBB)));
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@ -606,6 +606,7 @@ void LoopIndexSplit::removeBlocks(BasicBlock *InBB) {
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I->replaceAllUsesWith(UndefValue::get(I->getType()));
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I->eraseFromParent();
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}
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LPM->deleteSimpleAnalysisValue(BB, LP);
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DT->eraseNode(BB);
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DF->removeBlock(BB);
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LI->removeBlock(BB);
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@ -719,7 +720,7 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
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BranchInst *BR = cast<BranchInst>(SplitBlock->getTerminator());
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BasicBlock *FBB = BR->getSuccessor(1);
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BR->setUnconditionalDest(BR->getSuccessor(0));
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removeBlocks(FBB);
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removeBlocks(FBB, L);
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//[*] Update True loop's exit value using new exit value.
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ExitCondition->setOperand(ExitValueNum, TLExitValue);
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@ -729,7 +730,7 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
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BranchInst *FBR = cast<BranchInst>(FSplitBlock->getTerminator());
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BasicBlock *TBB = FBR->getSuccessor(0);
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FBR->setUnconditionalDest(FBR->getSuccessor(1));
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removeBlocks(TBB);
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removeBlocks(TBB, FalseLoop);
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return true;
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}
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