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Use ETForest instead of DominatorTree.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36247 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-04-18 04:39:32 +00:00
parent 1c2b862be0
commit 26c37b1fdc
1 changed files with 18 additions and 21 deletions
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39
lib/Transforms/Utils/LCSSA.cpp
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@ -49,7 +49,7 @@ namespace {
struct VISIBILITY_HIDDEN LCSSA : public FunctionPass {
// Cached analysis information for the current function.
LoopInfo *LI;
DominatorTree *DT;
ETForest *ET;
std::vector<BasicBlock*> LoopBlocks;
virtual bool runOnFunction(Function &F);
@ -66,14 +66,14 @@ namespace {
AU.addRequiredID(LoopSimplifyID);
AU.addPreservedID(LoopSimplifyID);
AU.addRequired<LoopInfo>();
AU.addRequired<DominatorTree>();
AU.addRequired<ETForest>();
}
private:
void getLoopValuesUsedOutsideLoop(Loop *L,
SetVector<Instruction*> &AffectedValues);
Value *GetValueForBlock(DominatorTree::Node *BB, Instruction *OrigInst,
std::map<DominatorTree::Node*, Value*> &Phis);
Value *GetValueForBlock(BasicBlock *BB, Instruction *OrigInst,
std::map<BasicBlock*, Value*> &Phis);
/// inLoop - returns true if the given block is within the current loop
const bool inLoop(BasicBlock* B) {
@ -92,7 +92,7 @@ bool LCSSA::runOnFunction(Function &F) {
bool changed = false;
LI = &getAnalysis<LoopInfo>();
DT = &getAnalysis<DominatorTree>();
ET = &getAnalysis<ETForest>();
for (LoopInfo::iterator I = LI->begin(), E = LI->end(); I != E; ++I)
changed |= visitSubloop(*I);
@ -142,18 +142,17 @@ void LCSSA::ProcessInstruction(Instruction *Instr,
++NumLCSSA; // We are applying the transformation
// Keep track of the blocks that have the value available already.
std::map<DominatorTree::Node*, Value*> Phis;
std::map<BasicBlock*, Value*> Phis;
DominatorTree::Node *InstrNode = DT->getNode(Instr->getParent());
//ETNode *InstrNode = ET->getNodeForBlock(Instr->getParent());
// Insert the LCSSA phi's into the exit blocks (dominated by the value), and
// add them to the Phi's map.
for (std::vector<BasicBlock*>::const_iterator BBI = exitBlocks.begin(),
BBE = exitBlocks.end(); BBI != BBE; ++BBI) {
BasicBlock *BB = *BBI;
DominatorTree::Node *ExitBBNode = DT->getNode(BB);
Value *&Phi = Phis[ExitBBNode];
if (!Phi && InstrNode->dominates(ExitBBNode)) {
Value *&Phi = Phis[BB];
if (!Phi && ET->dominates(Instr->getParent(), BB)) {
PHINode *PN = new PHINode(Instr->getType(), Instr->getName()+".lcssa",
BB->begin());
PN->reserveOperandSpace(std::distance(pred_begin(BB), pred_end(BB)));
@ -186,7 +185,7 @@ void LCSSA::ProcessInstruction(Instruction *Instr,
// Otherwise, patch up uses of the value with the appropriate LCSSA Phi,
// inserting PHI nodes into join points where needed.
Value *Val = GetValueForBlock(DT->getNode(UserBB), Instr, Phis);
Value *Val = GetValueForBlock(UserBB, Instr, Phis);
// Preincrement the iterator to avoid invalidating it when we change the
// value.
@ -225,8 +224,8 @@ void LCSSA::getLoopValuesUsedOutsideLoop(Loop *L,
/// GetValueForBlock - Get the value to use within the specified basic block.
/// available values are in Phis.
Value *LCSSA::GetValueForBlock(DominatorTree::Node *BB, Instruction *OrigInst,
std::map<DominatorTree::Node*, Value*> &Phis) {
Value *LCSSA::GetValueForBlock(BasicBlock *BB, Instruction *OrigInst,
std::map<BasicBlock*, Value*> &Phis) {
// If there is no dominator info for this BB, it is unreachable.
if (BB == 0)
return UndefValue::get(OrigInst->getType());
@ -235,7 +234,7 @@ Value *LCSSA::GetValueForBlock(DominatorTree::Node *BB, Instruction *OrigInst,
Value *&V = Phis[BB];
if (V) return V;
DominatorTree::Node *IDom = BB->getIDom();
BasicBlock* IDom = ET->getIDom(BB);
// Otherwise, there are two cases: we either have to insert a PHI node or we
// don't. We need to insert a PHI node if this block is not dominated by one
@ -248,24 +247,22 @@ Value *LCSSA::GetValueForBlock(DominatorTree::Node *BB, Instruction *OrigInst,
// dominate this block. Note that we *know* that the block defining the
// original instruction is in the idom chain, because if it weren't, then the
// original value didn't dominate this use.
if (!inLoop(IDom->getBlock())) {
if (!inLoop(IDom)) {
// Idom is not in the loop, we must still be "below" the exit block and must
// be fully dominated by the value live in the idom.
return V = GetValueForBlock(IDom, OrigInst, Phis);
}
BasicBlock *BBN = BB->getBlock();
// Otherwise, the idom is the loop, so we need to insert a PHI node. Do so
// now, then get values to fill in the incoming values for the PHI.
PHINode *PN = new PHINode(OrigInst->getType(), OrigInst->getName()+".lcssa",
BBN->begin());
PN->reserveOperandSpace(std::distance(pred_begin(BBN), pred_end(BBN)));
BB->begin());
PN->reserveOperandSpace(std::distance(pred_begin(BB), pred_end(BB)));
V = PN;
// Fill in the incoming values for the block.
for (pred_iterator PI = pred_begin(BBN), E = pred_end(BBN); PI != E; ++PI)
PN->addIncoming(GetValueForBlock(DT->getNode(*PI), OrigInst, Phis), *PI);
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
PN->addIncoming(GetValueForBlock(*PI, OrigInst, Phis), *PI);
return PN;
}