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Preserve simple analysis.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-08-13 22:22:13 +00:00
parent fc4c5f82f8
commit 21eca2a9cf
1 changed files with 5 additions and 4 deletions

9
lib/Transforms/Scalar/LoopIndexSplit.cpp

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