//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "machine-trace-metrics"
-#include "MachineTraceMetrics.h"
+#include "llvm/CodeGen/MachineTraceMetrics.h"
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/SparseSet.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/PostOrderIterator.h"
-#include "llvm/ADT/SparseSet.h"
using namespace llvm;
MF->getTarget().getSubtarget<TargetSubtargetInfo>();
SchedModel.init(*ST.getSchedModel(), &ST, TII);
BlockInfo.resize(MF->getNumBlockIDs());
+ ProcResourceCycles.resize(MF->getNumBlockIDs() *
+ SchedModel.getNumProcResourceKinds());
return false;
}
return FBI;
// Compute resource usage in the block.
- // FIXME: Compute per-functional unit counts.
FBI->HasCalls = false;
unsigned InstrCount = 0;
+
+ // Add up per-processor resource cycles as well.
+ unsigned PRKinds = SchedModel.getNumProcResourceKinds();
+ SmallVector<unsigned, 32> PRCycles(PRKinds);
+
for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
const MachineInstr *MI = I;
++InstrCount;
if (MI->isCall())
FBI->HasCalls = true;
+
+ // Count processor resources used.
+ if (!SchedModel.hasInstrSchedModel())
+ continue;
+ const MCSchedClassDesc *SC = SchedModel.resolveSchedClass(MI);
+ if (!SC->isValid())
+ continue;
+
+ for (TargetSchedModel::ProcResIter
+ PI = SchedModel.getWriteProcResBegin(SC),
+ PE = SchedModel.getWriteProcResEnd(SC); PI != PE; ++PI) {
+ assert(PI->ProcResourceIdx < PRKinds && "Bad processor resource kind");
+ PRCycles[PI->ProcResourceIdx] += PI->Cycles;
+ }
}
FBI->InstrCount = InstrCount;
+
+ // Scale the resource cycles so they are comparable.
+ unsigned PROffset = MBB->getNumber() * PRKinds;
+ for (unsigned K = 0; K != PRKinds; ++K)
+ ProcResourceCycles[PROffset + K] =
+ PRCycles[K] * SchedModel.getResourceFactor(K);
+
return FBI;
}
+ArrayRef<unsigned>
+MachineTraceMetrics::getProcResourceCycles(unsigned MBBNum) const {
+ assert(BlockInfo[MBBNum].hasResources() &&
+ "getResources() must be called before getProcResourceCycles()");
+ unsigned PRKinds = SchedModel.getNumProcResourceKinds();
+ assert((MBBNum+1) * PRKinds <= ProcResourceCycles.size());
+ return ArrayRef<unsigned>(ProcResourceCycles.data() + MBBNum * PRKinds,
+ PRKinds);
+}
+
+
//===----------------------------------------------------------------------===//
// Ensemble utility functions
//===----------------------------------------------------------------------===//
MachineTraceMetrics::Ensemble::Ensemble(MachineTraceMetrics *ct)
: MTM(*ct) {
BlockInfo.resize(MTM.BlockInfo.size());
+ unsigned PRKinds = MTM.SchedModel.getNumProcResourceKinds();
+ ProcResourceDepths.resize(MTM.BlockInfo.size() * PRKinds);
+ ProcResourceHeights.resize(MTM.BlockInfo.size() * PRKinds);
}
// Virtual destructor serves as an anchor.
void MachineTraceMetrics::Ensemble::
computeDepthResources(const MachineBasicBlock *MBB) {
TraceBlockInfo *TBI = &BlockInfo[MBB->getNumber()];
+ unsigned PRKinds = MTM.SchedModel.getNumProcResourceKinds();
+ unsigned PROffset = MBB->getNumber() * PRKinds;
// Compute resources from trace above. The top block is simple.
if (!TBI->Pred) {
TBI->InstrDepth = 0;
TBI->Head = MBB->getNumber();
+ std::fill(ProcResourceDepths.begin() + PROffset,
+ ProcResourceDepths.begin() + PROffset + PRKinds, 0);
return;
}
// Compute from the block above. A post-order traversal ensures the
// predecessor is always computed first.
- TraceBlockInfo *PredTBI = &BlockInfo[TBI->Pred->getNumber()];
+ unsigned PredNum = TBI->Pred->getNumber();
+ TraceBlockInfo *PredTBI = &BlockInfo[PredNum];
assert(PredTBI->hasValidDepth() && "Trace above has not been computed yet");
const FixedBlockInfo *PredFBI = MTM.getResources(TBI->Pred);
TBI->InstrDepth = PredTBI->InstrDepth + PredFBI->InstrCount;
TBI->Head = PredTBI->Head;
+
+ // Compute per-resource depths.
+ ArrayRef<unsigned> PredPRDepths = getProcResourceDepths(PredNum);
+ ArrayRef<unsigned> PredPRCycles = MTM.getProcResourceCycles(PredNum);
+ for (unsigned K = 0; K != PRKinds; ++K)
+ ProcResourceDepths[PROffset + K] = PredPRDepths[K] + PredPRCycles[K];
}
// Update resource-related information in the TraceBlockInfo for MBB.
void MachineTraceMetrics::Ensemble::
computeHeightResources(const MachineBasicBlock *MBB) {
TraceBlockInfo *TBI = &BlockInfo[MBB->getNumber()];
+ unsigned PRKinds = MTM.SchedModel.getNumProcResourceKinds();
+ unsigned PROffset = MBB->getNumber() * PRKinds;
// Compute resources for the current block.
TBI->InstrHeight = MTM.getResources(MBB)->InstrCount;
+ ArrayRef<unsigned> PRCycles = MTM.getProcResourceCycles(MBB->getNumber());
// The trace tail is done.
if (!TBI->Succ) {
TBI->Tail = MBB->getNumber();
+ std::copy(PRCycles.begin(), PRCycles.end(),
+ ProcResourceHeights.begin() + PROffset);
return;
}
// Compute from the block below. A post-order traversal ensures the
// predecessor is always computed first.
- TraceBlockInfo *SuccTBI = &BlockInfo[TBI->Succ->getNumber()];
+ unsigned SuccNum = TBI->Succ->getNumber();
+ TraceBlockInfo *SuccTBI = &BlockInfo[SuccNum];
assert(SuccTBI->hasValidHeight() && "Trace below has not been computed yet");
TBI->InstrHeight += SuccTBI->InstrHeight;
TBI->Tail = SuccTBI->Tail;
+
+ // Compute per-resource heights.
+ ArrayRef<unsigned> SuccPRHeights = getProcResourceHeights(SuccNum);
+ for (unsigned K = 0; K != PRKinds; ++K)
+ ProcResourceHeights[PROffset + K] = SuccPRHeights[K] + PRCycles[K];
}
// Check if depth resources for MBB are valid and return the TBI.
return TBI->hasValidHeight() ? TBI : 0;
}
+/// Get an array of processor resource depths for MBB. Indexed by processor
+/// resource kind, this array contains the scaled processor resources consumed
+/// by all blocks preceding MBB in its trace. It does not include instructions
+/// in MBB.
+///
+/// Compare TraceBlockInfo::InstrDepth.
+ArrayRef<unsigned>
+MachineTraceMetrics::Ensemble::
+getProcResourceDepths(unsigned MBBNum) const {
+ unsigned PRKinds = MTM.SchedModel.getNumProcResourceKinds();
+ assert((MBBNum+1) * PRKinds <= ProcResourceDepths.size());
+ return ArrayRef<unsigned>(ProcResourceDepths.data() + MBBNum * PRKinds,
+ PRKinds);
+}
+
+/// Get an array of processor resource heights for MBB. Indexed by processor
+/// resource kind, this array contains the scaled processor resources consumed
+/// by this block and all blocks following it in its trace.
+///
+/// Compare TraceBlockInfo::InstrHeight.
+ArrayRef<unsigned>
+MachineTraceMetrics::Ensemble::
+getProcResourceHeights(unsigned MBBNum) const {
+ unsigned PRKinds = MTM.SchedModel.getNumProcResourceKinds();
+ assert((MBBNum+1) * PRKinds <= ProcResourceHeights.size());
+ return ArrayRef<unsigned>(ProcResourceHeights.data() + MBBNum * PRKinds,
+ PRKinds);
+}
+
//===----------------------------------------------------------------------===//
// Trace Selection Strategies
//===----------------------------------------------------------------------===//
const MachineInstr *DefMI = MTM.MRI->getVRegDef(LIR.Reg);
// Ignore dependencies outside the current trace.
const TraceBlockInfo &DefTBI = BlockInfo[DefMI->getParent()->getNumber()];
- if (!DefTBI.isEarlierInSameTrace(TBI))
+ if (!DefTBI.isUsefulDominator(TBI))
continue;
unsigned Len = LIR.Height + Cycles[DefMI].Depth;
MaxLen = std::max(MaxLen, Len);
SmallVector<DataDep, 8> Deps;
while (!Stack.empty()) {
MBB = Stack.pop_back_val();
- DEBUG(dbgs() << "Depths for BB#" << MBB->getNumber() << ":\n");
+ DEBUG(dbgs() << "\nDepths for BB#" << MBB->getNumber() << ":\n");
TraceBlockInfo &TBI = BlockInfo[MBB->getNumber()];
TBI.HasValidInstrDepths = true;
TBI.CriticalPath = 0;
+ // Print out resource depths here as well.
+ DEBUG({
+ dbgs() << format("%7u Instructions\n", TBI.InstrDepth);
+ ArrayRef<unsigned> PRDepths = getProcResourceDepths(MBB->getNumber());
+ for (unsigned K = 0; K != PRDepths.size(); ++K)
+ if (PRDepths[K]) {
+ unsigned Factor = MTM.SchedModel.getResourceFactor(K);
+ dbgs() << format("%6uc @ ", MTM.getCycles(PRDepths[K]))
+ << MTM.SchedModel.getProcResource(K)->Name << " ("
+ << PRDepths[K]/Factor << " ops x" << Factor << ")\n";
+ }
+ });
+
// Also compute the critical path length through MBB when possible.
if (TBI.HasValidInstrHeights)
TBI.CriticalPath = computeCrossBlockCriticalPath(TBI);
const TraceBlockInfo&DepTBI =
BlockInfo[Dep.DefMI->getParent()->getNumber()];
// Ignore dependencies from outside the current trace.
- if (!DepTBI.isEarlierInSameTrace(TBI))
+ if (!DepTBI.isUsefulDominator(TBI))
continue;
assert(DepTBI.HasValidInstrDepths && "Inconsistent dependency");
unsigned DepCycle = Cycles.lookup(Dep.DefMI).Depth;
// Add latency if DefMI is a real instruction. Transients get latency 0.
if (!Dep.DefMI->isTransient())
DepCycle += MTM.SchedModel
- .computeOperandLatency(Dep.DefMI, Dep.DefOp, UseMI, Dep.UseOp,
- /* FindMin = */ false);
+ .computeOperandLatency(Dep.DefMI, Dep.DefOp, UseMI, Dep.UseOp);
Cycle = std::max(Cycle, DepCycle);
}
// Remember the instruction depth.
// We may not know the UseMI of this dependency, if it came from the
// live-in list. SchedModel can handle a NULL UseMI.
DepHeight += SchedModel
- .computeOperandLatency(MI, MO.getOperandNo(), I->MI, I->Op,
- /* FindMin = */ false);
+ .computeOperandLatency(MI, MO.getOperandNo(), I->MI, I->Op);
}
Height = std::max(Height, DepHeight);
// This regunit is dead above MI.
// Adjust height by Dep.DefMI latency.
if (!Dep.DefMI->isTransient())
UseHeight += SchedModel.computeOperandLatency(Dep.DefMI, Dep.DefOp,
- UseMI, Dep.UseOp, false);
+ UseMI, Dep.UseOp);
// Update Heights[DefMI] to be the maximum height seen.
MIHeightMap::iterator I;
return false;
}
-/// Assuming that DefMI was used by Trace.back(), add it to the live-in lists
-/// of all the blocks in Trace. Stop when reaching the block that contains
-/// DefMI.
+/// Assuming that the virtual register defined by DefMI:DefOp was used by
+/// Trace.back(), add it to the live-in lists of all the blocks in Trace. Stop
+/// when reaching the block that contains DefMI.
void MachineTraceMetrics::Ensemble::
-addLiveIns(const MachineInstr *DefMI,
+addLiveIns(const MachineInstr *DefMI, unsigned DefOp,
ArrayRef<const MachineBasicBlock*> Trace) {
assert(!Trace.empty() && "Trace should contain at least one block");
- unsigned Reg = DefMI->getOperand(0).getReg();
+ unsigned Reg = DefMI->getOperand(DefOp).getReg();
assert(TargetRegisterInfo::isVirtualRegister(Reg));
const MachineBasicBlock *DefMBB = DefMI->getParent();
TBI.HasValidInstrHeights = true;
TBI.CriticalPath = 0;
+ DEBUG({
+ dbgs() << format("%7u Instructions\n", TBI.InstrHeight);
+ ArrayRef<unsigned> PRHeights = getProcResourceHeights(MBB->getNumber());
+ for (unsigned K = 0; K != PRHeights.size(); ++K)
+ if (PRHeights[K]) {
+ unsigned Factor = MTM.SchedModel.getResourceFactor(K);
+ dbgs() << format("%6uc @ ", MTM.getCycles(PRHeights[K]))
+ << MTM.SchedModel.getProcResource(K)->Name << " ("
+ << PRHeights[K]/Factor << " ops x" << Factor << ")\n";
+ }
+ });
+
// Get dependencies from PHIs in the trace successor.
const MachineBasicBlock *Succ = TBI.Succ;
// If MBB is the last block in the trace, and it has a back-edge to the
DEBUG(dbgs() << "pred\t" << Height << '\t' << *PHI);
if (pushDepHeight(Deps.front(), PHI, Height,
Heights, MTM.SchedModel, MTM.TII))
- addLiveIns(Deps.front().DefMI, Stack);
+ addLiveIns(Deps.front().DefMI, Deps.front().DefOp, Stack);
}
}
}
// Update the required height of any virtual registers read by MI.
for (unsigned i = 0, e = Deps.size(); i != e; ++i)
if (pushDepHeight(Deps[i], MI, Cycle, Heights, MTM.SchedModel, MTM.TII))
- addLiveIns(Deps[i].DefMI, Stack);
+ addLiveIns(Deps[i].DefMI, Deps[i].DefOp, Stack);
InstrCycles &MICycles = Cycles[MI];
MICycles.Height = Cycle;
// Add latency if DefMI is a real instruction. Transients get latency 0.
if (!Dep.DefMI->isTransient())
DepCycle += TE.MTM.SchedModel
- .computeOperandLatency(Dep.DefMI, Dep.DefOp, PHI, Dep.UseOp, false);
+ .computeOperandLatency(Dep.DefMI, Dep.DefOp, PHI, Dep.UseOp);
return DepCycle;
}
unsigned MachineTraceMetrics::Trace::getResourceDepth(bool Bottom) const {
- // For now, we compute the resource depth from instruction count / issue
- // width. Eventually, we should compute resource depth per functional unit
- // and return the max.
+ // Find the limiting processor resource.
+ // Numbers have been pre-scaled to be comparable.
+ unsigned PRMax = 0;
+ ArrayRef<unsigned> PRDepths = TE.getProcResourceDepths(getBlockNum());
+ if (Bottom) {
+ ArrayRef<unsigned> PRCycles = TE.MTM.getProcResourceCycles(getBlockNum());
+ for (unsigned K = 0; K != PRDepths.size(); ++K)
+ PRMax = std::max(PRMax, PRDepths[K] + PRCycles[K]);
+ } else {
+ for (unsigned K = 0; K != PRDepths.size(); ++K)
+ PRMax = std::max(PRMax, PRDepths[K]);
+ }
+ // Convert to cycle count.
+ PRMax = TE.MTM.getCycles(PRMax);
+
unsigned Instrs = TBI.InstrDepth;
if (Bottom)
Instrs += TE.MTM.BlockInfo[getBlockNum()].InstrCount;
if (unsigned IW = TE.MTM.SchedModel.getIssueWidth())
Instrs /= IW;
// Assume issue width 1 without a schedule model.
- return Instrs;
+ return std::max(Instrs, PRMax);
}
+
unsigned MachineTraceMetrics::Trace::
-getResourceLength(ArrayRef<const MachineBasicBlock*> Extrablocks) const {
+getResourceLength(ArrayRef<const MachineBasicBlock*> Extrablocks,
+ ArrayRef<const MCSchedClassDesc*> ExtraInstrs) const {
+ // Add up resources above and below the center block.
+ ArrayRef<unsigned> PRDepths = TE.getProcResourceDepths(getBlockNum());
+ ArrayRef<unsigned> PRHeights = TE.getProcResourceHeights(getBlockNum());
+ unsigned PRMax = 0;
+ for (unsigned K = 0; K != PRDepths.size(); ++K) {
+ unsigned PRCycles = PRDepths[K] + PRHeights[K];
+ for (unsigned I = 0; I != Extrablocks.size(); ++I)
+ PRCycles += TE.MTM.getProcResourceCycles(Extrablocks[I]->getNumber())[K];
+ for (unsigned I = 0; I != ExtraInstrs.size(); ++I) {
+ const MCSchedClassDesc* SC = ExtraInstrs[I];
+ if (!SC->isValid())
+ continue;
+ for (TargetSchedModel::ProcResIter
+ PI = TE.MTM.SchedModel.getWriteProcResBegin(SC),
+ PE = TE.MTM.SchedModel.getWriteProcResEnd(SC); PI != PE; ++PI) {
+ if (PI->ProcResourceIdx != K)
+ continue;
+ PRCycles += (PI->Cycles * TE.MTM.SchedModel.getResourceFactor(K));
+ }
+ }
+ PRMax = std::max(PRMax, PRCycles);
+ }
+ // Convert to cycle count.
+ PRMax = TE.MTM.getCycles(PRMax);
+
unsigned Instrs = TBI.InstrDepth + TBI.InstrHeight;
for (unsigned i = 0, e = Extrablocks.size(); i != e; ++i)
Instrs += TE.MTM.getResources(Extrablocks[i])->InstrCount;
if (unsigned IW = TE.MTM.SchedModel.getIssueWidth())
Instrs /= IW;
// Assume issue width 1 without a schedule model.
- return Instrs;
+ return std::max(Instrs, PRMax);
}
void MachineTraceMetrics::Ensemble::print(raw_ostream &OS) const {
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