bool MachineBlockPlacementStats::runOnMachineFunction(MachineFunction &F) {
// Check for single-block functions and skip them.
if (llvm::next(F.begin()) == F.end())
return false;
MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
MBFI = &getAnalysis<MachineBlockFrequencyInfo>();
for (MachineFunction::iterator I = F.begin(), E = F.end(); I != E; ++I) {
BlockFrequency BlockFreq = MBFI->getBlockFreq(I);
Statistic &NumBranches = (I->succ_size() > 1) ? NumCondBranches
: NumUncondBranches;
Statistic &BranchTakenFreq = (I->succ_size() > 1) ? CondBranchTakenFreq
: UncondBranchTakenFreq;
for (MachineBasicBlock::succ_iterator SI = I->succ_begin(),
SE = I->succ_end();
SI != SE; ++SI) {
// Skip if this successor is a fallthrough.
if (I->isLayoutSuccessor(*SI))
continue;
BlockFrequency EdgeFreq = BlockFreq * MBPI->getEdgeProbability(I, *SI);
++NumBranches;
BranchTakenFreq += EdgeFreq.getFrequency();
}
}
return false;
}
float
LiveIntervals::getSpillWeight(bool isDef, bool isUse,
const MachineBlockFrequencyInfo *MBFI,
const MachineInstr *MI) {
BlockFrequency Freq = MBFI->getBlockFreq(MI->getParent());
const float Scale = 1.0f / MBFI->getEntryFreq();
return (isDef + isUse) * (Freq.getFrequency() * Scale);
}
float
LiveIntervals::getSpillWeight(bool isDef, bool isUse, BlockFrequency freq) {
const float Scale = 1.0f / BlockFrequency::getEntryFrequency();
return (isDef + isUse) * (freq.getFrequency() * Scale);
}
bool PartialInlinerImpl::shouldPartialInline(
CallSite CS, FunctionCloner &Cloner, BlockFrequency WeightedOutliningRcost,
OptimizationRemarkEmitter &ORE) {
using namespace ore;
if (SkipCostAnalysis)
return true;
Instruction *Call = CS.getInstruction();
Function *Callee = CS.getCalledFunction();
assert(Callee == Cloner.ClonedFunc);
Function *Caller = CS.getCaller();
auto &CalleeTTI = (*GetTTI)(*Callee);
InlineCost IC = getInlineCost(CS, getInlineParams(), CalleeTTI,
*GetAssumptionCache, GetBFI, PSI, &ORE);
if (IC.isAlways()) {
ORE.emit(OptimizationRemarkAnalysis(DEBUG_TYPE, "AlwaysInline", Call)
<< NV("Callee", Cloner.OrigFunc)
<< " should always be fully inlined, not partially");
return false;
}
if (IC.isNever()) {
ORE.emit(OptimizationRemarkMissed(DEBUG_TYPE, "NeverInline", Call)
<< NV("Callee", Cloner.OrigFunc) << " not partially inlined into "
<< NV("Caller", Caller)
<< " because it should never be inlined (cost=never)");
return false;
}
if (!IC) {
ORE.emit(OptimizationRemarkAnalysis(DEBUG_TYPE, "TooCostly", Call)
<< NV("Callee", Cloner.OrigFunc) << " not partially inlined into "
<< NV("Caller", Caller) << " because too costly to inline (cost="
<< NV("Cost", IC.getCost()) << ", threshold="
<< NV("Threshold", IC.getCostDelta() + IC.getCost()) << ")");
return false;
}
const DataLayout &DL = Caller->getParent()->getDataLayout();
// The savings of eliminating the call:
int NonWeightedSavings = getCallsiteCost(CS, DL);
BlockFrequency NormWeightedSavings(NonWeightedSavings);
// Weighted saving is smaller than weighted cost, return false
if (NormWeightedSavings < WeightedOutliningRcost) {
ORE.emit(
OptimizationRemarkAnalysis(DEBUG_TYPE, "OutliningCallcostTooHigh", Call)
<< NV("Callee", Cloner.OrigFunc) << " not partially inlined into "
<< NV("Caller", Caller) << " runtime overhead (overhead="
<< NV("Overhead", (unsigned)WeightedOutliningRcost.getFrequency())
<< ", savings="
<< NV("Savings", (unsigned)NormWeightedSavings.getFrequency()) << ")"
<< " of making the outlined call is too high");
return false;
}
ORE.emit(OptimizationRemarkAnalysis(DEBUG_TYPE, "CanBePartiallyInlined", Call)
<< NV("Callee", Cloner.OrigFunc) << " can be partially inlined into "
<< NV("Caller", Caller) << " with cost=" << NV("Cost", IC.getCost())
<< " (threshold="
<< NV("Threshold", IC.getCostDelta() + IC.getCost()) << ")");
return true;
}
