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modernize this pass a bit: use efficient set/map and reduce indentation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112404 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-08-29 04:23:04 +00:00
parent 6654ff2741
commit dc1ceb370a
1 changed files with 47 additions and 44 deletions
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31
lib/Transforms/Scalar/LICM.cpp
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@ -217,7 +217,7 @@ namespace {
///
void FindPromotableValuesInLoop(
std::vector<std::pair<AllocaInst*, Value*> > &PromotedValues,
std::map<Value*, AllocaInst*> &Val2AlMap);
DenseMap<Value*, AllocaInst*> &Val2AlMap);
};
}
@ -520,9 +520,10 @@ void LICM::sink(Instruction &I) {
if (PHINode *UPN = dyn_cast<PHINode>(U)) {
// Only insert into each predecessor once, so that we don't have
// different incoming values from the same block!
std::map<BasicBlock*, Value*> InsertedBlocks;
for (unsigned i = 0, e = UPN->getNumIncomingValues(); i != e; ++i)
if (UPN->getIncomingValue(i) == &I) {
DenseMap<BasicBlock*, Value*> InsertedBlocks;
for (unsigned i = 0, e = UPN->getNumIncomingValues(); i != e; ++i) {
if (UPN->getIncomingValue(i) != &I) continue;
BasicBlock *Pred = UPN->getIncomingBlock(i);
Value *&PredVal = InsertedBlocks[Pred];
if (!PredVal) {
@ -546,15 +547,19 @@ void LICM::sink(Instruction &I) {
// that is dominated by the instruction, storing the result into the memory
// location. Be careful not to insert the instruction into any particular
// basic block more than once.
std::set<BasicBlock*> InsertedBlocks;
SmallPtrSet<BasicBlock*, 16> InsertedBlocks;
BasicBlock *InstOrigBB = I.getParent();
for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i) {
BasicBlock *ExitBlock = ExitBlocks[i];
if (isExitBlockDominatedByBlockInLoop(ExitBlock, InstOrigBB)) {
if (!isExitBlockDominatedByBlockInLoop(ExitBlock, InstOrigBB))
continue;
// If we haven't already processed this exit block, do so now.
if (InsertedBlocks.insert(ExitBlock).second) {
if (!InsertedBlocks.insert(ExitBlock))
continue;
// Insert the code after the last PHI node...
BasicBlock::iterator InsertPt = ExitBlock->getFirstNonPHI();
@ -577,8 +582,6 @@ void LICM::sink(Instruction &I) {
// Now that we have inserted the instruction, store it into the alloca
if (AI) new StoreInst(New, AI, InsertPt);
}
}
}
// If the instruction doesn't dominate any exit blocks, it must be dead.
if (InsertedBlocks.empty()) {
@ -660,7 +663,7 @@ void LICM::PromoteValuesInLoop() {
// value has an alloca instruction for it, and a canonical version of the
// pointer.
std::vector<std::pair<AllocaInst*, Value*> > PromotedValues;
std::map<Value*, AllocaInst*> ValueToAllocaMap; // Map of ptr to alloca
DenseMap<Value*, AllocaInst*> ValueToAllocaMap; // Map of ptr to alloca
FindPromotableValuesInLoop(PromotedValues, ValueToAllocaMap);
if (ValueToAllocaMap.empty()) return; // If there are values to promote.
@ -717,12 +720,12 @@ void LICM::PromoteValuesInLoop() {
// Rewrite all loads and stores in the block of the pointer...
for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E; ++II) {
if (LoadInst *L = dyn_cast<LoadInst>(II)) {
std::map<Value*, AllocaInst*>::iterator
DenseMap<Value*, AllocaInst*>::iterator
I = ValueToAllocaMap.find(L->getOperand(0));
if (I != ValueToAllocaMap.end())
L->setOperand(0, I->second); // Rewrite load instruction...
} else if (StoreInst *S = dyn_cast<StoreInst>(II)) {
std::map<Value*, AllocaInst*>::iterator
DenseMap<Value*, AllocaInst*>::iterator
I = ValueToAllocaMap.find(S->getOperand(1));
if (I != ValueToAllocaMap.end())
S->setOperand(1, I->second); // Rewrite store instruction...
@ -778,7 +781,7 @@ void LICM::PromoteValuesInLoop() {
/// alloca.
void LICM::FindPromotableValuesInLoop(
std::vector<std::pair<AllocaInst*, Value*> > &PromotedValues,
std::map<Value*, AllocaInst*> &ValueToAllocaMap) {
DenseMap<Value*, AllocaInst*> &ValueToAllocaMap) {
Instruction *FnStart = CurLoop->getHeader()->getParent()->begin()->begin();
// Loop over all of the alias sets in the tracker object.
@ -855,7 +858,7 @@ void LICM::FindPromotableValuesInLoop(
CurAST->copyValue(V, AI);
for (AliasSet::iterator I = AS.begin(), E = AS.end(); I != E; ++I)
ValueToAllocaMap.insert(std::make_pair(I->getValue(), AI));
ValueToAllocaMap[I->getValue()] = AI;
DEBUG(dbgs() << "LICM: Promoting value: " << *V << "\n");
}