diff options
| -rw-r--r-- | llvm/lib/Transforms/Utils/LCSSA.cpp | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/llvm/lib/Transforms/Utils/LCSSA.cpp b/llvm/lib/Transforms/Utils/LCSSA.cpp index a9ae7c98da7..7d4f3a343e6 100644 --- a/llvm/lib/Transforms/Utils/LCSSA.cpp +++ b/llvm/lib/Transforms/Utils/LCSSA.cpp @@ -86,7 +86,8 @@ namespace { } private: void getLoopValuesUsedOutsideLoop(Loop *L, - SetVector<Instruction*> &AffectedValues); + SetVector<Instruction*> &AffectedValues, + const SmallVector<BasicBlock*, 8>& exitBlocks); Value *GetValueForBlock(DomTreeNode *BB, Instruction *OrigInst, DenseMap<DomTreeNode*, Value*> &Phis); @@ -116,17 +117,17 @@ bool LCSSA::runOnLoop(Loop *L, LPPassManager &LPM) { LoopBlocks.insert(LoopBlocks.end(), L->block_begin(), L->block_end()); std::sort(LoopBlocks.begin(), LoopBlocks.end()); + SmallVector<BasicBlock*, 8> exitBlocks; + L->getExitBlocks(exitBlocks); + SetVector<Instruction*> AffectedValues; - getLoopValuesUsedOutsideLoop(L, AffectedValues); + getLoopValuesUsedOutsideLoop(L, AffectedValues, exitBlocks); // If no values are affected, we can save a lot of work, since we know that // nothing will be changed. if (AffectedValues.empty()) return false; - SmallVector<BasicBlock*, 8> exitBlocks; - L->getExitBlocks(exitBlocks); - // Iterate over all affected values for this loop and insert Phi nodes // for them in the appropriate exit blocks @@ -160,7 +161,7 @@ void LCSSA::ProcessInstruction(Instruction *Instr, if (!Phi && DT->dominates(InstrNode, ExitBBNode)) { PHINode *PN = PHINode::Create(Instr->getType(), Instr->getName()+".lcssa", BB->begin()); - PN->reserveOperandSpace(std::distance(pred_begin(BB), pred_end(BB))); + PN->reserveOperandSpace(PredCache.GetNumPreds(BB)); // Remember that this phi makes the value alive in this block. Phi = PN; @@ -202,15 +203,16 @@ void LCSSA::ProcessInstruction(Instruction *Instr, /// getLoopValuesUsedOutsideLoop - Return any values defined in the loop that /// are used by instructions outside of it. void LCSSA::getLoopValuesUsedOutsideLoop(Loop *L, - SetVector<Instruction*> &AffectedValues) { + SetVector<Instruction*> &AffectedValues, + const SmallVector<BasicBlock*, 8>& exitBlocks) { // FIXME: For large loops, we may be able to avoid a lot of use-scanning // by using dominance information. In particular, if a block does not // dominate any of the loop exits, then none of the values defined in the // block could be used outside the loop. - for (Loop::block_iterator BB = L->block_begin(), E = L->block_end(); - BB != E; ++BB) { + for (Loop::block_iterator BB = L->block_begin(), BE = L->block_end(); + BB != BE; ++BB) { for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end(); I != E; ++I) - for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; + for (Value::use_iterator UI = I->use_begin(), UE = I->use_end(); UI != UE; ++UI) { BasicBlock *UserBB = cast<Instruction>(*UI)->getParent(); if (PHINode* p = dyn_cast<PHINode>(*UI)) { @@ -263,7 +265,7 @@ Value *LCSSA::GetValueForBlock(DomTreeNode *BB, Instruction *OrigInst, // now, then get values to fill in the incoming values for the PHI. PHINode *PN = PHINode::Create(OrigInst->getType(), OrigInst->getName() + ".lcssa", BBN->begin()); - PN->reserveOperandSpace(std::distance(pred_begin(BBN), pred_end(BBN))); + PN->reserveOperandSpace(PredCache.GetNumPreds(BBN)); Phis.insert(std::make_pair(BB, PN)); // Fill in the incoming values for the block. |
