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NFC: Use range-based for loops and more consistent naming.

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No functional changes intended.

(I plan on doing some modifications to this function and would like to
have as few unrelated changes as possible in the patch)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229649 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Jasper 2015-02-18 08:19:16 +00:00
parent 66bd6852bb
commit 87010b0917
1 changed files with 15 additions and 19 deletions
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34
lib/CodeGen/MachineBlockPlacement.cpp
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@ -347,29 +347,27 @@ MachineBasicBlock *MachineBlockPlacement::selectBestSuccessor(
uint32_t WeightScale = 0;
uint32_t SumWeight = MBPI->getSumForBlock(BB, WeightScale);
DEBUG(dbgs() << "Attempting merge from: " << getBlockName(BB) << "\n");
for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
SE = BB->succ_end();
SI != SE; ++SI) {
if (BlockFilter && !BlockFilter->count(*SI))
for (MachineBasicBlock *Succ : BB->successors()) {
if (BlockFilter && !BlockFilter->count(Succ))
continue;
BlockChain &SuccChain = *BlockToChain[*SI];
BlockChain &SuccChain = *BlockToChain[Succ];
if (&SuccChain == &Chain) {
DEBUG(dbgs() << " " << getBlockName(*SI) << " -> Already merged!\n");
DEBUG(dbgs() << " " << getBlockName(Succ) << " -> Already merged!\n");
continue;
}
if (*SI != *SuccChain.begin()) {
DEBUG(dbgs() << " " << getBlockName(*SI) << " -> Mid chain!\n");
if (Succ != *SuccChain.begin()) {
DEBUG(dbgs() << " " << getBlockName(Succ) << " -> Mid chain!\n");
continue;
}
uint32_t SuccWeight = MBPI->getEdgeWeight(BB, *SI);
uint32_t SuccWeight = MBPI->getEdgeWeight(BB, Succ);
BranchProbability SuccProb(SuccWeight / WeightScale, SumWeight);
// Only consider successors which are either "hot", or wouldn't violate
// any CFG constraints.
if (SuccChain.LoopPredecessors != 0) {
if (SuccProb < HotProb) {
DEBUG(dbgs() << " " << getBlockName(*SI) << " -> " << SuccProb
DEBUG(dbgs() << " " << getBlockName(Succ) << " -> " << SuccProb
<< " (prob) (CFG conflict)\n");
continue;
}
@ -379,33 +377,31 @@ MachineBasicBlock *MachineBlockPlacement::selectBestSuccessor(
BlockFrequency CandidateEdgeFreq =
MBFI->getBlockFreq(BB) * SuccProb * HotProb.getCompl();
bool BadCFGConflict = false;
for (MachineBasicBlock::pred_iterator PI = (*SI)->pred_begin(),
PE = (*SI)->pred_end();
PI != PE; ++PI) {
if (*PI == *SI || (BlockFilter && !BlockFilter->count(*PI)) ||
BlockToChain[*PI] == &Chain)
for (MachineBasicBlock *Pred : Succ->predecessors()) {
if (Pred == Succ || (BlockFilter && !BlockFilter->count(Pred)) ||
BlockToChain[Pred] == &Chain)
continue;
BlockFrequency PredEdgeFreq =
MBFI->getBlockFreq(*PI) * MBPI->getEdgeProbability(*PI, *SI);
MBFI->getBlockFreq(Pred) * MBPI->getEdgeProbability(Pred, Succ);
if (PredEdgeFreq >= CandidateEdgeFreq) {
BadCFGConflict = true;
break;
}
}
if (BadCFGConflict) {
DEBUG(dbgs() << " " << getBlockName(*SI) << " -> " << SuccProb
DEBUG(dbgs() << " " << getBlockName(Succ) << " -> " << SuccProb
<< " (prob) (non-cold CFG conflict)\n");
continue;
}
}
DEBUG(dbgs() << " " << getBlockName(*SI) << " -> " << SuccProb
DEBUG(dbgs() << " " << getBlockName(Succ) << " -> " << SuccProb
<< " (prob)"
<< (SuccChain.LoopPredecessors != 0 ? " (CFG break)" : "")
<< "\n");
if (BestSucc && BestWeight >= SuccWeight)
continue;
BestSucc = *SI;
BestSucc = Succ;
BestWeight = SuccWeight;
}
return BestSucc;