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[PM] Replace another Pass argument with specific analyses that are

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optionally updated by MergeBlockIntoPredecessors.

No functionality changed, just refactoring to clear the way for the new
pass manager.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226392 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2015-01-18 02:11:23 +00:00
parent d39e52bef7
commit 0389537c08
4 changed files with 27 additions and 28 deletions
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44
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -107,7 +107,9 @@ bool llvm::DeleteDeadPHIs(BasicBlock *BB, const TargetLibraryInfo *TLI) {
/// MergeBlockIntoPredecessor - Attempts to merge a block into its predecessor,
/// if possible. The return value indicates success or failure.
bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, Pass *P) {
bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, DominatorTree *DT,
LoopInfo *LI, AliasAnalysis *AA,
MemoryDependenceAnalysis *MemDep) {
// Don't merge away blocks who have their address taken.
if (BB->hasAddressTaken()) return false;
@ -142,11 +144,8 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, Pass *P) {
}
// Begin by getting rid of unneeded PHIs.
if (isa<PHINode>(BB->front())) {
auto *AA = P ? P->getAnalysisIfAvailable<AliasAnalysis>() : nullptr;
auto *MemDep = P ? P->getAnalysisIfAvailable<MemoryDependenceAnalysis>() : nullptr;
if (isa<PHINode>(BB->front()))
FoldSingleEntryPHINodes(BB, AA, MemDep);
}
// Delete the unconditional branch from the predecessor...
PredBB->getInstList().pop_back();
@ -163,28 +162,23 @@ bool llvm::MergeBlockIntoPredecessor(BasicBlock *BB, Pass *P) {
PredBB->takeName(BB);
// Finally, erase the old block and update dominator info.
if (P) {
if (DominatorTreeWrapperPass *DTWP =
P->getAnalysisIfAvailable<DominatorTreeWrapperPass>()) {
DominatorTree &DT = DTWP->getDomTree();
if (DomTreeNode *DTN = DT.getNode(BB)) {
DomTreeNode *PredDTN = DT.getNode(PredBB);
SmallVector<DomTreeNode*, 8> Children(DTN->begin(), DTN->end());
for (SmallVectorImpl<DomTreeNode *>::iterator DI = Children.begin(),
DE = Children.end(); DI != DE; ++DI)
DT.changeImmediateDominator(*DI, PredDTN);
if (DT)
if (DomTreeNode *DTN = DT->getNode(BB)) {
DomTreeNode *PredDTN = DT->getNode(PredBB);
SmallVector<DomTreeNode *, 8> Children(DTN->begin(), DTN->end());
for (SmallVectorImpl<DomTreeNode *>::iterator DI = Children.begin(),
DE = Children.end();
DI != DE; ++DI)
DT->changeImmediateDominator(*DI, PredDTN);
DT.eraseNode(BB);
}
if (auto *LIWP = P->getAnalysisIfAvailable<LoopInfoWrapperPass>())
LIWP->getLoopInfo().removeBlock(BB);
if (MemoryDependenceAnalysis *MD =
P->getAnalysisIfAvailable<MemoryDependenceAnalysis>())
MD->invalidateCachedPredecessors();
DT->eraseNode(BB);
}
}
if (LI)
LI->removeBlock(BB);
if (MemDep)
MemDep->invalidateCachedPredecessors();
BB->eraseFromParent();
return true;