diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp | 1969 |
1 files changed, 1241 insertions, 728 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp index 4c3e4e3..0b548b2 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp @@ -20,6 +20,7 @@ #include "llvm/InlineAsm.h" #include "llvm/CodeGen/SchedulerRegistry.h" #include "llvm/CodeGen/SelectionDAGISel.h" +#include "llvm/CodeGen/ScheduleHazardRecognizer.h" #include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetData.h" #include "llvm/Target/TargetMachine.h" @@ -65,6 +66,10 @@ static RegisterScheduler "which tries to balance ILP and register pressure", createILPListDAGScheduler); +static cl::opt<bool> DisableSchedCycles( + "disable-sched-cycles", cl::Hidden, cl::init(false), + cl::desc("Disable cycle-level precision during preRA scheduling")); + namespace { //===----------------------------------------------------------------------===// /// ScheduleDAGRRList - The actual register reduction list scheduler @@ -83,31 +88,56 @@ private: /// AvailableQueue - The priority queue to use for the available SUnits. SchedulingPriorityQueue *AvailableQueue; + /// PendingQueue - This contains all of the instructions whose operands have + /// been issued, but their results are not ready yet (due to the latency of + /// the operation). Once the operands becomes available, the instruction is + /// added to the AvailableQueue. + std::vector<SUnit*> PendingQueue; + + /// HazardRec - The hazard recognizer to use. + ScheduleHazardRecognizer *HazardRec; + + /// CurCycle - The current scheduler state corresponds to this cycle. + unsigned CurCycle; + + /// MinAvailableCycle - Cycle of the soonest available instruction. + unsigned MinAvailableCycle; + /// LiveRegDefs - A set of physical registers and their definition /// that are "live". These nodes must be scheduled before any other nodes that /// modifies the registers can be scheduled. unsigned NumLiveRegs; std::vector<SUnit*> LiveRegDefs; - std::vector<unsigned> LiveRegCycles; + std::vector<SUnit*> LiveRegGens; /// Topo - A topological ordering for SUnits which permits fast IsReachable /// and similar queries. ScheduleDAGTopologicalSort Topo; public: - ScheduleDAGRRList(MachineFunction &mf, - bool isbottomup, bool needlatency, - SchedulingPriorityQueue *availqueue) - : ScheduleDAGSDNodes(mf), isBottomUp(isbottomup), NeedLatency(needlatency), - AvailableQueue(availqueue), Topo(SUnits) { - } + ScheduleDAGRRList(MachineFunction &mf, bool needlatency, + SchedulingPriorityQueue *availqueue, + CodeGenOpt::Level OptLevel) + : ScheduleDAGSDNodes(mf), isBottomUp(availqueue->isBottomUp()), + NeedLatency(needlatency), AvailableQueue(availqueue), CurCycle(0), + Topo(SUnits) { + + const TargetMachine &tm = mf.getTarget(); + if (DisableSchedCycles || !NeedLatency) + HazardRec = new ScheduleHazardRecognizer(); + else + HazardRec = tm.getInstrInfo()->CreateTargetHazardRecognizer(&tm, this); + } ~ScheduleDAGRRList() { + delete HazardRec; delete AvailableQueue; } void Schedule(); + ScheduleHazardRecognizer *getHazardRec() { return HazardRec; } + /// IsReachable - Checks if SU is reachable from TargetSU. bool IsReachable(const SUnit *SU, const SUnit *TargetSU) { return Topo.IsReachable(SU, TargetSU); @@ -136,24 +166,37 @@ public: } private: + bool isReady(SUnit *SU) { + return DisableSchedCycles || !AvailableQueue->hasReadyFilter() || + AvailableQueue->isReady(SU); + } + void ReleasePred(SUnit *SU, const SDep *PredEdge); - void ReleasePredecessors(SUnit *SU, unsigned CurCycle); + void ReleasePredecessors(SUnit *SU); void ReleaseSucc(SUnit *SU, const SDep *SuccEdge); void ReleaseSuccessors(SUnit *SU); + void ReleasePending(); + void AdvanceToCycle(unsigned NextCycle); + void AdvancePastStalls(SUnit *SU); + void EmitNode(SUnit *SU); + void ScheduleNodeBottomUp(SUnit*); void CapturePred(SDep *PredEdge); - void ScheduleNodeBottomUp(SUnit*, unsigned); - void ScheduleNodeTopDown(SUnit*, unsigned); void UnscheduleNodeBottomUp(SUnit*); - void BacktrackBottomUp(SUnit*, unsigned, unsigned&); + void RestoreHazardCheckerBottomUp(); + void BacktrackBottomUp(SUnit*, SUnit*); SUnit *CopyAndMoveSuccessors(SUnit*); void InsertCopiesAndMoveSuccs(SUnit*, unsigned, const TargetRegisterClass*, const TargetRegisterClass*, SmallVector<SUnit*, 2>&); bool DelayForLiveRegsBottomUp(SUnit*, SmallVector<unsigned, 4>&); - void ListScheduleTopDown(); + + SUnit *PickNodeToScheduleBottomUp(); void ListScheduleBottomUp(); + void ScheduleNodeTopDown(SUnit*); + void ListScheduleTopDown(); + /// CreateNewSUnit - Creates a new SUnit and returns a pointer to it. /// Updates the topological ordering if required. @@ -190,11 +233,13 @@ private: void ScheduleDAGRRList::Schedule() { DEBUG(dbgs() << "********** List Scheduling BB#" << BB->getNumber() - << " **********\n"); + << " '" << BB->getName() << "' **********\n"); + CurCycle = 0; + MinAvailableCycle = DisableSchedCycles ? 0 : UINT_MAX; NumLiveRegs = 0; - LiveRegDefs.resize(TRI->getNumRegs(), NULL); - LiveRegCycles.resize(TRI->getNumRegs(), 0); + LiveRegDefs.resize(TRI->getNumRegs(), NULL); + LiveRegGens.resize(TRI->getNumRegs(), NULL); // Build the scheduling graph. BuildSchedGraph(NULL); @@ -204,13 +249,15 @@ void ScheduleDAGRRList::Schedule() { Topo.InitDAGTopologicalSorting(); AvailableQueue->initNodes(SUnits); - + + HazardRec->Reset(); + // Execute the actual scheduling loop Top-Down or Bottom-Up as appropriate. if (isBottomUp) ListScheduleBottomUp(); else ListScheduleTopDown(); - + AvailableQueue->releaseState(); } @@ -243,33 +290,197 @@ void ScheduleDAGRRList::ReleasePred(SUnit *SU, const SDep *PredEdge) { // to be scheduled. Ignore the special EntrySU node. if (PredSU->NumSuccsLeft == 0 && PredSU != &EntrySU) { PredSU->isAvailable = true; - AvailableQueue->push(PredSU); + + unsigned Height = PredSU->getHeight(); + if (Height < MinAvailableCycle) + MinAvailableCycle = Height; + + if (isReady(SU)) { + AvailableQueue->push(PredSU); + } + // CapturePred and others may have left the node in the pending queue, avoid + // adding it twice. + else if (!PredSU->isPending) { + PredSU->isPending = true; + PendingQueue.push_back(PredSU); + } } } -void ScheduleDAGRRList::ReleasePredecessors(SUnit *SU, unsigned CurCycle) { +/// Call ReleasePred for each predecessor, then update register live def/gen. +/// Always update LiveRegDefs for a register dependence even if the current SU +/// also defines the register. This effectively create one large live range +/// across a sequence of two-address node. This is important because the +/// entire chain must be scheduled together. Example: +/// +/// flags = (3) add +/// flags = (2) addc flags +/// flags = (1) addc flags +/// +/// results in +/// +/// LiveRegDefs[flags] = 3 +/// LiveRegGens[flags] = 1 +/// +/// If (2) addc is unscheduled, then (1) addc must also be unscheduled to avoid +/// interference on flags. +void ScheduleDAGRRList::ReleasePredecessors(SUnit *SU) { // Bottom up: release predecessors for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); I != E; ++I) { ReleasePred(SU, &*I); if (I->isAssignedRegDep()) { // This is a physical register dependency and it's impossible or - // expensive to copy the register. Make sure nothing that can + // expensive to copy the register. Make sure nothing that can // clobber the register is scheduled between the predecessor and // this node. - if (!LiveRegDefs[I->getReg()]) { + SUnit *RegDef = LiveRegDefs[I->getReg()]; (void)RegDef; + assert((!RegDef || RegDef == SU || RegDef == I->getSUnit()) && + "interference on register dependence"); + LiveRegDefs[I->getReg()] = I->getSUnit(); + if (!LiveRegGens[I->getReg()]) { ++NumLiveRegs; - LiveRegDefs[I->getReg()] = I->getSUnit(); - LiveRegCycles[I->getReg()] = CurCycle; + LiveRegGens[I->getReg()] = SU; } } } } +/// Check to see if any of the pending instructions are ready to issue. If +/// so, add them to the available queue. +void ScheduleDAGRRList::ReleasePending() { + if (DisableSchedCycles) { + assert(PendingQueue.empty() && "pending instrs not allowed in this mode"); + return; + } + + // If the available queue is empty, it is safe to reset MinAvailableCycle. + if (AvailableQueue->empty()) + MinAvailableCycle = UINT_MAX; + + // Check to see if any of the pending instructions are ready to issue. If + // so, add them to the available queue. + for (unsigned i = 0, e = PendingQueue.size(); i != e; ++i) { + unsigned ReadyCycle = + isBottomUp ? PendingQueue[i]->getHeight() : PendingQueue[i]->getDepth(); + if (ReadyCycle < MinAvailableCycle) + MinAvailableCycle = ReadyCycle; + + if (PendingQueue[i]->isAvailable) { + if (!isReady(PendingQueue[i])) + continue; + AvailableQueue->push(PendingQueue[i]); + } + PendingQueue[i]->isPending = false; + PendingQueue[i] = PendingQueue.back(); + PendingQueue.pop_back(); + --i; --e; + } +} + +/// Move the scheduler state forward by the specified number of Cycles. +void ScheduleDAGRRList::AdvanceToCycle(unsigned NextCycle) { + if (NextCycle <= CurCycle) + return; + + AvailableQueue->setCurCycle(NextCycle); + if (!HazardRec->isEnabled()) { + // Bypass lots of virtual calls in case of long latency. + CurCycle = NextCycle; + } + else { + for (; CurCycle != NextCycle; ++CurCycle) { + if (isBottomUp) + HazardRec->RecedeCycle(); + else + HazardRec->AdvanceCycle(); + } + } + // FIXME: Instead of visiting the pending Q each time, set a dirty flag on the + // available Q to release pending nodes at least once before popping. + ReleasePending(); +} + +/// Move the scheduler state forward until the specified node's dependents are +/// ready and can be scheduled with no resource conflicts. +void ScheduleDAGRRList::AdvancePastStalls(SUnit *SU) { + if (DisableSchedCycles) + return; + + unsigned ReadyCycle = isBottomUp ? SU->getHeight() : SU->getDepth(); + + // Bump CurCycle to account for latency. We assume the latency of other + // available instructions may be hidden by the stall (not a full pipe stall). + // This updates the hazard recognizer's cycle before reserving resources for + // this instruction. + AdvanceToCycle(ReadyCycle); + + // Calls are scheduled in their preceding cycle, so don't conflict with + // hazards from instructions after the call. EmitNode will reset the + // scoreboard state before emitting the call. + if (isBottomUp && SU->isCall) + return; + + // FIXME: For resource conflicts in very long non-pipelined stages, we + // should probably skip ahead here to avoid useless scoreboard checks. + int Stalls = 0; + while (true) { + ScheduleHazardRecognizer::HazardType HT = + HazardRec->getHazardType(SU, isBottomUp ? -Stalls : Stalls); + + if (HT == ScheduleHazardRecognizer::NoHazard) + break; + + ++Stalls; + } + AdvanceToCycle(CurCycle + Stalls); +} + +/// Record this SUnit in the HazardRecognizer. +/// Does not update CurCycle. +void ScheduleDAGRRList::EmitNode(SUnit *SU) { + if (!HazardRec->isEnabled()) + return; + + // Check for phys reg copy. + if (!SU->getNode()) + return; + + switch (SU->getNode()->getOpcode()) { + default: + assert(SU->getNode()->isMachineOpcode() && + "This target-independent node should not be scheduled."); + break; + case ISD::MERGE_VALUES: + case ISD::TokenFactor: + case ISD::CopyToReg: + case ISD::CopyFromReg: + case ISD::EH_LABEL: + // Noops don't affect the scoreboard state. Copies are likely to be + // removed. + return; + case ISD::INLINEASM: + // For inline asm, clear the pipeline state. + HazardRec->Reset(); + return; + } + if (isBottomUp && SU->isCall) { + // Calls are scheduled with their preceding instructions. For bottom-up + // scheduling, clear the pipeline state before emitting. + HazardRec->Reset(); + } + + HazardRec->EmitInstruction(SU); + + if (!isBottomUp && SU->isCall) { + HazardRec->Reset(); + } +} + /// ScheduleNodeBottomUp - Add the node to the schedule. Decrement the pending /// count of its predecessors. If a predecessor pending count is zero, add it to /// the Available queue. -void ScheduleDAGRRList::ScheduleNodeBottomUp(SUnit *SU, unsigned CurCycle) { +void ScheduleDAGRRList::ScheduleNodeBottomUp(SUnit *SU) { DEBUG(dbgs() << "\n*** Scheduling [" << CurCycle << "]: "); DEBUG(SU->dump(this)); @@ -278,36 +489,51 @@ void ScheduleDAGRRList::ScheduleNodeBottomUp(SUnit *SU, unsigned CurCycle) { DEBUG(dbgs() << " Height [" << SU->getHeight() << "] pipeline stall!\n"); #endif - // FIXME: Handle noop hazard. + // FIXME: Do not modify node height. It may interfere with + // backtracking. Instead add a "ready cycle" to SUnit. Before scheduling the + // node it's ready cycle can aid heuristics, and after scheduling it can + // indicate the scheduled cycle. SU->setHeightToAtLeast(CurCycle); + + // Reserve resources for the scheduled intruction. + EmitNode(SU); + Sequence.push_back(SU); AvailableQueue->ScheduledNode(SU); - ReleasePredecessors(SU, CurCycle); + // Update liveness of predecessors before successors to avoid treating a + // two-address node as a live range def. + ReleasePredecessors(SU); // Release all the implicit physical register defs that are live. for (SUnit::succ_iterator I = SU->Succs.begin(), E = SU->Succs.end(); I != E; ++I) { - if (I->isAssignedRegDep()) { - if (LiveRegCycles[I->getReg()] == I->getSUnit()->getHeight()) { - assert(NumLiveRegs > 0 && "NumLiveRegs is already zero!"); - assert(LiveRegDefs[I->getReg()] == SU && - "Physical register dependency violated?"); - --NumLiveRegs; - LiveRegDefs[I->getReg()] = NULL; - LiveRegCycles[I->getReg()] = 0; - } + // LiveRegDegs[I->getReg()] != SU when SU is a two-address node. + if (I->isAssignedRegDep() && LiveRegDefs[I->getReg()] == SU) { + assert(NumLiveRegs > 0 && "NumLiveRegs is already zero!"); + --NumLiveRegs; + LiveRegDefs[I->getReg()] = NULL; + LiveRegGens[I->getReg()] = NULL; } } SU->isScheduled = true; + + // Conditions under which the scheduler should eagerly advance the cycle: + // (1) No available instructions + // (2) All pipelines full, so available instructions must have hazards. + // + // If HazardRec is disabled, count each inst as one cycle. + if (!HazardRec->isEnabled() || HazardRec->atIssueLimit() + || AvailableQueue->empty()) + AdvanceToCycle(CurCycle + 1); } /// CapturePred - This does the opposite of ReleasePred. Since SU is being /// unscheduled, incrcease the succ left count of its predecessors. Remove /// them from AvailableQueue if necessary. -void ScheduleDAGRRList::CapturePred(SDep *PredEdge) { +void ScheduleDAGRRList::CapturePred(SDep *PredEdge) { SUnit *PredSU = PredEdge->getSUnit(); if (PredSU->isAvailable) { PredSU->isAvailable = false; @@ -328,59 +554,98 @@ void ScheduleDAGRRList::UnscheduleNodeBottomUp(SUnit *SU) { for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); I != E; ++I) { CapturePred(&*I); - if (I->isAssignedRegDep() && SU->getHeight() == LiveRegCycles[I->getReg()]){ + if (I->isAssignedRegDep() && SU == LiveRegGens[I->getReg()]){ assert(NumLiveRegs > 0 && "NumLiveRegs is already zero!"); assert(LiveRegDefs[I->getReg()] == I->getSUnit() && "Physical register dependency violated?"); --NumLiveRegs; LiveRegDefs[I->getReg()] = NULL; - LiveRegCycles[I->getReg()] = 0; + LiveRegGens[I->getReg()] = NULL; } } for (SUnit::succ_iterator I = SU->Succs.begin(), E = SU->Succs.end(); I != E; ++I) { if (I->isAssignedRegDep()) { + // This becomes the nearest def. Note that an earlier def may still be + // pending if this is a two-address node. + LiveRegDefs[I->getReg()] = SU; if (!LiveRegDefs[I->getReg()]) { - LiveRegDefs[I->getReg()] = SU; ++NumLiveRegs; } - if (I->getSUnit()->getHeight() < LiveRegCycles[I->getReg()]) - LiveRegCycles[I->getReg()] = I->getSUnit()->getHeight(); + if (LiveRegGens[I->getReg()] == NULL || + I->getSUnit()->getHeight() < LiveRegGens[I->getReg()]->getHeight()) + LiveRegGens[I->getReg()] = I->getSUnit(); } } + if (SU->getHeight() < MinAvailableCycle) + MinAvailableCycle = SU->getHeight(); SU->setHeightDirty(); SU->isScheduled = false; SU->isAvailable = true; - AvailableQueue->push(SU); + if (!DisableSchedCycles && AvailableQueue->hasReadyFilter()) { + // Don't make available until backtracking is complete. + SU->isPending = true; + PendingQueue.push_back(SU); + } + else { + AvailableQueue->push(SU); + } AvailableQueue->UnscheduledNode(SU); } +/// After backtracking, the hazard checker needs to be restored to a state +/// corresponding the the current cycle. +void ScheduleDAGRRList::RestoreHazardCheckerBottomUp() { + HazardRec->Reset(); + + unsigned LookAhead = std::min((unsigned)Sequence.size(), + HazardRec->getMaxLookAhead()); + if (LookAhead == 0) + return; + + std::vector<SUnit*>::const_iterator I = (Sequence.end() - LookAhead); + unsigned HazardCycle = (*I)->getHeight(); + for (std::vector<SUnit*>::const_iterator E = Sequence.end(); I != E; ++I) { + SUnit *SU = *I; + for (; SU->getHeight() > HazardCycle; ++HazardCycle) { + HazardRec->RecedeCycle(); + } + EmitNode(SU); + } +} + /// BacktrackBottomUp - Backtrack scheduling to a previous cycle specified in /// BTCycle in order to schedule a specific node. -void ScheduleDAGRRList::BacktrackBottomUp(SUnit *SU, unsigned BtCycle, - unsigned &CurCycle) { - SUnit *OldSU = NULL; - while (CurCycle > BtCycle) { - OldSU = Sequence.back(); +void ScheduleDAGRRList::BacktrackBottomUp(SUnit *SU, SUnit *BtSU) { + SUnit *OldSU = Sequence.back(); + while (true) { Sequence.pop_back(); if (SU->isSucc(OldSU)) // Don't try to remove SU from AvailableQueue. SU->isAvailable = false; + // FIXME: use ready cycle instead of height + CurCycle = OldSU->getHeight(); UnscheduleNodeBottomUp(OldSU); - --CurCycle; AvailableQueue->setCurCycle(CurCycle); + if (OldSU == BtSU) + break; + OldSU = Sequence.back(); } assert(!SU->isSucc(OldSU) && "Something is wrong!"); + RestoreHazardCheckerBottomUp(); + + ReleasePending(); + ++NumBacktracks; } static bool isOperandOf(const SUnit *SU, SDNode *N) { for (const SDNode *SUNode = SU->getNode(); SUNode; - SUNode = SUNode->getFlaggedNode()) { + SUNode = SUNode->getGluedNode()) { if (SUNode->isOperandOf(N)) return true; } @@ -390,18 +655,18 @@ static bool isOperandOf(const SUnit *SU, SDNode *N) { /// CopyAndMoveSuccessors - Clone the specified node and move its scheduled /// successors to the newly created node. SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) { - if (SU->getNode()->getFlaggedNode()) - return NULL; - SDNode *N = SU->getNode(); if (!N) return NULL; + if (SU->getNode()->getGluedNode()) + return NULL; + SUnit *NewSU; bool TryUnfold = false; for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) { EVT VT = N->getValueType(i); - if (VT == MVT::Flag) + if (VT == MVT::Glue) return NULL; else if (VT == MVT::Other) TryUnfold = true; @@ -409,7 +674,7 @@ SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) { for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { const SDValue &Op = N->getOperand(i); EVT VT = Op.getNode()->getValueType(Op.getResNo()); - if (VT == MVT::Flag) + if (VT == MVT::Glue) return NULL; } @@ -441,13 +706,15 @@ SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) { } else { LoadSU = CreateNewSUnit(LoadNode); LoadNode->setNodeId(LoadSU->NodeNum); + + InitNumRegDefsLeft(LoadSU); ComputeLatency(LoadSU); } SUnit *NewSU = CreateNewSUnit(N); assert(N->getNodeId() == -1 && "Node already inserted!"); N->setNodeId(NewSU->NodeNum); - + const TargetInstrDesc &TID = TII->get(N->getMachineOpcode()); for (unsigned i = 0; i != TID.getNumOperands(); ++i) { if (TID.getOperandConstraint(i, TOI::TIED_TO) != -1) { @@ -457,6 +724,8 @@ SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) { } if (TID.isCommutable()) NewSU->isCommutable = true; + + InitNumRegDefsLeft(NewSU); ComputeLatency(NewSU); // Record all the edges to and from the old SU, by category. @@ -507,6 +776,10 @@ SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) { RemovePred(SuccDep, D); D.setSUnit(NewSU); AddPred(SuccDep, D); + // Balance register pressure. + if (AvailableQueue->tracksRegPressure() && SuccDep->isScheduled + && !D.isCtrl() && NewSU->NumRegDefsLeft > 0) + --NewSU->NumRegDefsLeft; } for (unsigned i = 0, e = ChainSuccs.size(); i != e; ++i) { SDep D = ChainSuccs[i]; @@ -517,7 +790,7 @@ SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) { D.setSUnit(LoadSU); AddPred(SuccDep, D); } - } + } // Add a data dependency to reflect that NewSU reads the value defined // by LoadSU. @@ -633,52 +906,52 @@ static EVT getPhysicalRegisterVT(SDNode *N, unsigned Reg, /// CheckForLiveRegDef - Return true and update live register vector if the /// specified register def of the specified SUnit clobbers any "live" registers. -static bool CheckForLiveRegDef(SUnit *SU, unsigned Reg, +static void CheckForLiveRegDef(SUnit *SU, unsigned Reg, std::vector<SUnit*> &LiveRegDefs, SmallSet<unsigned, 4> &RegAdded, SmallVector<unsigned, 4> &LRegs, const TargetRegisterInfo *TRI) { - bool Added = false; - if (LiveRegDefs[Reg] && LiveRegDefs[Reg] != SU) { - if (RegAdded.insert(Reg)) { + for (const unsigned *AliasI = TRI->getOverlaps(Reg); *AliasI; ++AliasI) { + + // Check if Ref is live. + if (!LiveRegDefs[Reg]) continue; + + // Allow multiple uses of the same def. + if (LiveRegDefs[Reg] == SU) continue; + + // Add Reg to the set of interfering live regs. + if (RegAdded.insert(Reg)) LRegs.push_back(Reg); - Added = true; - } } - for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) - if (LiveRegDefs[*Alias] && LiveRegDefs[*Alias] != SU) { - if (RegAdded.insert(*Alias)) { - LRegs.push_back(*Alias); - Added = true; - } - } - return Added; } /// DelayForLiveRegsBottomUp - Returns true if it is necessary to delay /// scheduling of the given node to satisfy live physical register dependencies. /// If the specific node is the last one that's available to schedule, do /// whatever is necessary (i.e. backtracking or cloning) to make it possible. -bool ScheduleDAGRRList::DelayForLiveRegsBottomUp(SUnit *SU, - SmallVector<unsigned, 4> &LRegs){ +bool ScheduleDAGRRList:: +DelayForLiveRegsBottomUp(SUnit *SU, SmallVector<unsigned, 4> &LRegs) { if (NumLiveRegs == 0) return false; SmallSet<unsigned, 4> RegAdded; // If this node would clobber any "live" register, then it's not ready. + // + // If SU is the currently live definition of the same register that it uses, + // then we are free to schedule it. for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); I != E; ++I) { - if (I->isAssignedRegDep()) + if (I->isAssignedRegDep() && LiveRegDefs[I->getReg()] != SU) CheckForLiveRegDef(I->getSUnit(), I->getReg(), LiveRegDefs, RegAdded, LRegs, TRI); } - for (SDNode *Node = SU->getNode(); Node; Node = Node->getFlaggedNode()) { + for (SDNode *Node = SU->getNode(); Node; Node = Node->getGluedNode()) { if (Node->getOpcode() == ISD::INLINEASM) { // Inline asm can clobber physical defs. unsigned NumOps = Node->getNumOperands(); - if (Node->getOperand(NumOps-1).getValueType() == MVT::Flag) - --NumOps; // Ignore the flag operand. + if (Node->getOperand(NumOps-1).getValueType() == MVT::Glue) + --NumOps; // Ignore the glue operand. for (unsigned i = InlineAsm::Op_FirstOperand; i != NumOps;) { unsigned Flags = @@ -708,17 +981,151 @@ bool ScheduleDAGRRList::DelayForLiveRegsBottomUp(SUnit *SU, for (const unsigned *Reg = TID.ImplicitDefs; *Reg; ++Reg) CheckForLiveRegDef(SU, *Reg, LiveRegDefs, RegAdded, LRegs, TRI); } + return !LRegs.empty(); } +/// Return a node that can be scheduled in this cycle. Requirements: +/// (1) Ready: latency has been satisfied +/// (2) No Hazards: resources are available +/// (3) No Interferences: may unschedule to break register interferences. +SUnit *ScheduleDAGRRList::PickNodeToScheduleBottomUp() { + SmallVector<SUnit*, 4> Interferences; + DenseMap<SUnit*, SmallVector<unsigned, 4> > LRegsMap; + + SUnit *CurSU = AvailableQueue->pop(); + while (CurSU) { + SmallVector<unsigned, 4> LRegs; + if (!DelayForLiveRegsBottomUp(CurSU, LRegs)) + break; + LRegsMap.insert(std::make_pair(CurSU, LRegs)); + + CurSU->isPending = true; // This SU is not in AvailableQueue right now. + Interferences.push_back(CurSU); + CurSU = AvailableQueue->pop(); + } + if (CurSU) { + // Add the nodes that aren't ready back onto the available list. + for (unsigned i = 0, e = Interferences.size(); i != e; ++i) { + Interferences[i]->isPending = false; + assert(Interferences[i]->isAvailable && "must still be available"); + AvailableQueue->push(Interferences[i]); + } + return CurSU; + } + + // All candidates are delayed due to live physical reg dependencies. + // Try backtracking, code duplication, or inserting cross class copies + // to resolve it. + for (unsigned i = 0, e = Interferences.size(); i != e; ++i) { + SUnit *TrySU = Interferences[i]; + SmallVector<unsigned, 4> &LRegs = LRegsMap[TrySU]; + + // Try unscheduling up to the point where it's safe to schedule + // this node. + SUnit *BtSU = NULL; + unsigned LiveCycle = UINT_MAX; + for (unsigned j = 0, ee = LRegs.size(); j != ee; ++j) { + unsigned Reg = LRegs[j]; + if (LiveRegGens[Reg]->getHeight() < LiveCycle) { + BtSU = LiveRegGens[Reg]; + LiveCycle = BtSU->getHeight(); + } + } + if (!WillCreateCycle(TrySU, BtSU)) { + BacktrackBottomUp(TrySU, BtSU); + + // Force the current node to be scheduled before the node that + // requires the physical reg dep. + if (BtSU->isAvailable) { + BtSU->isAvailable = false; + if (!BtSU->isPending) + AvailableQueue->remove(BtSU); + } + AddPred(TrySU, SDep(BtSU, SDep::Order, /*Latency=*/1, + /*Reg=*/0, /*isNormalMemory=*/false, + /*isMustAlias=*/false, /*isArtificial=*/true)); + + // If one or more successors has been unscheduled, then the current + // node is no longer avaialable. Schedule a successor that's now + // available instead. + if (!TrySU->isAvailable) { + CurSU = AvailableQueue->pop(); + } + else { + CurSU = TrySU; + TrySU->isPending = false; + Interferences.erase(Interferences.begin()+i); + } + break; + } + } + + if (!CurSU) { + // Can't backtrack. If it's too expensive to copy the value, then try + // duplicate the nodes that produces these "too expensive to copy" + // values to break the dependency. In case even that doesn't work, + // insert cross class copies. + // If it's not too expensive, i.e. cost != -1, issue copies. + SUnit *TrySU = Interferences[0]; + SmallVector<unsigned, 4> &LRegs = LRegsMap[TrySU]; + assert(LRegs.size() == 1 && "Can't handle this yet!"); + unsigned Reg = LRegs[0]; + SUnit *LRDef = LiveRegDefs[Reg]; + EVT VT = getPhysicalRegisterVT(LRDef->getNode(), Reg, TII); + const TargetRegisterClass *RC = + TRI->getMinimalPhysRegClass(Reg, VT); + const TargetRegisterClass *DestRC = TRI->getCrossCopyRegClass(RC); + + // If cross copy register class is null, then it must be possible copy + // the value directly. Do not try duplicate the def. + SUnit *NewDef = 0; + if (DestRC) + NewDef = CopyAndMoveSuccessors(LRDef); + else + DestRC = RC; + if (!NewDef) { + // Issue copies, these can be expensive cross register class copies. + SmallVector<SUnit*, 2> Copies; + InsertCopiesAndMoveSuccs(LRDef, Reg, DestRC, RC, Copies); + DEBUG(dbgs() << " Adding an edge from SU #" << TrySU->NodeNum + << " to SU #" << Copies.front()->NodeNum << "\n"); + AddPred(TrySU, SDep(Copies.front(), SDep::Order, /*Latency=*/1, + /*Reg=*/0, /*isNormalMemory=*/false, + /*isMustAlias=*/false, + /*isArtificial=*/true)); + NewDef = Copies.back(); + } + + DEBUG(dbgs() << " Adding an edge from SU #" << NewDef->NodeNum + << " to SU #" << TrySU->NodeNum << "\n"); + LiveRegDefs[Reg] = NewDef; + AddPred(NewDef, SDep(TrySU, SDep::Order, /*Latency=*/1, + /*Reg=*/0, /*isNormalMemory=*/false, + /*isMustAlias=*/false, + /*isArtificial=*/true)); + TrySU->isAvailable = false; + CurSU = NewDef; + } + + assert(CurSU && "Unable to resolve live physical register dependencies!"); + + // Add the nodes that aren't ready back onto the available list. + for (unsigned i = 0, e = Interferences.size(); i != e; ++i) { + Interferences[i]->isPending = false; + // May no longer be available due to backtracking. + if (Interferences[i]->isAvailable) { + AvailableQueue->push(Interferences[i]); + } + } + return CurSU; +} /// ListScheduleBottomUp - The main loop of list scheduling for bottom-up /// schedulers. void ScheduleDAGRRList::ListScheduleBottomUp() { - unsigned CurCycle = 0; - // Release any predecessors of the special Exit node. - ReleasePredecessors(&ExitSU, CurCycle); + ReleasePredecessors(&ExitSU); // Add root to Available queue. if (!SUnits.empty()) { @@ -730,135 +1137,29 @@ void ScheduleDAGRRList::ListScheduleBottomUp() { // While Available queue is not empty, grab the node with the highest // priority. If it is not ready put it back. Schedule the node. - SmallVector<SUnit*, 4> NotReady; - DenseMap<SUnit*, SmallVector<unsigned, 4> > LRegsMap; Sequence.reserve(SUnits.size()); while (!AvailableQueue->empty()) { - bool Delayed = false; - LRegsMap.clear(); - SUnit *CurSU = AvailableQueue->pop(); - while (CurSU) { - SmallVector<unsigned, 4> LRegs; - if (!DelayForLiveRegsBottomUp(CurSU, LRegs)) - break; - Delayed = true; - LRegsMap.insert(std::make_pair(CurSU, LRegs)); + DEBUG(dbgs() << "\n*** Examining Available\n"; + AvailableQueue->dump(this)); - CurSU->isPending = true; // This SU is not in AvailableQueue right now. - NotReady.push_back(CurSU); - CurSU = AvailableQueue->pop(); - } + // Pick the best node to schedule taking all constraints into + // consideration. + SUnit *SU = PickNodeToScheduleBottomUp(); - // All candidates are delayed due to live physical reg dependencies. - // Try backtracking, code duplication, or inserting cross class copies - // to resolve it. - if (Delayed && !CurSU) { - for (unsigned i = 0, e = NotReady.size(); i != e; ++i) { - SUnit *TrySU = NotReady[i]; - SmallVector<unsigned, 4> &LRegs = LRegsMap[TrySU]; - - // Try unscheduling up to the point where it's safe to schedule - // this node. - unsigned LiveCycle = CurCycle; - for (unsigned j = 0, ee = LRegs.size(); j != ee; ++j) { - unsigned Reg = LRegs[j]; - unsigned LCycle = LiveRegCycles[Reg]; - LiveCycle = std::min(LiveCycle, LCycle); - } - SUnit *OldSU = Sequence[LiveCycle]; - if (!WillCreateCycle(TrySU, OldSU)) { - BacktrackBottomUp(TrySU, LiveCycle, CurCycle); - // Force the current node to be scheduled before the node that - // requires the physical reg dep. - if (OldSU->isAvailable) { - OldSU->isAvailable = false; - AvailableQueue->remove(OldSU); - } - AddPred(TrySU, SDep(OldSU, SDep::Order, /*Latency=*/1, - /*Reg=*/0, /*isNormalMemory=*/false, - /*isMustAlias=*/false, /*isArtificial=*/true)); - // If one or more successors has been unscheduled, then the current - // node is no longer avaialable. Schedule a successor that's now - // available instead. - if (!TrySU->isAvailable) - CurSU = AvailableQueue->pop(); - else { - CurSU = TrySU; - TrySU->isPending = false; - NotReady.erase(NotReady.begin()+i); - } - break; - } - } + AdvancePastStalls(SU); - if (!CurSU) { - // Can't backtrack. If it's too expensive to copy the value, then try - // duplicate the nodes that produces these "too expensive to copy" - // values to break the dependency. In case even that doesn't work, - // insert cross class copies. - // If it's not too expensive, i.e. cost != -1, issue copies. - SUnit *TrySU = NotReady[0]; - SmallVector<unsigned, 4> &LRegs = LRegsMap[TrySU]; - assert(LRegs.size() == 1 && "Can't handle this yet!"); - unsigned Reg = LRegs[0]; - SUnit *LRDef = LiveRegDefs[Reg]; - EVT VT = getPhysicalRegisterVT(LRDef->getNode(), Reg, TII); - const TargetRegisterClass *RC = - TRI->getMinimalPhysRegClass(Reg, VT); - const TargetRegisterClass *DestRC = TRI->getCrossCopyRegClass(RC); - - // If cross copy register class is null, then it must be possible copy - // the value directly. Do not try duplicate the def. - SUnit *NewDef = 0; - if (DestRC) - NewDef = CopyAndMoveSuccessors(LRDef); - else - DestRC = RC; - if (!NewDef) { - // Issue copies, these can be expensive cross register class copies. - SmallVector<SUnit*, 2> Copies; - InsertCopiesAndMoveSuccs(LRDef, Reg, DestRC, RC, Copies); - DEBUG(dbgs() << " Adding an edge from SU #" << TrySU->NodeNum - << " to SU #" << Copies.front()->NodeNum << "\n"); - AddPred(TrySU, SDep(Copies.front(), SDep::Order, /*Latency=*/1, - /*Reg=*/0, /*isNormalMemory=*/false, - /*isMustAlias=*/false, - /*isArtificial=*/true)); - NewDef = Copies.back(); - } + ScheduleNodeBottomUp(SU); - DEBUG(dbgs() << " Adding an edge from SU #" << NewDef->NodeNum - << " to SU #" << TrySU->NodeNum << "\n"); - LiveRegDefs[Reg] = NewDef; - AddPred(NewDef, SDep(TrySU, SDep::Order, /*Latency=*/1, - /*Reg=*/0, /*isNormalMemory=*/false, - /*isMustAlias=*/false, - /*isArtificial=*/true)); - TrySU->isAvailable = false; - CurSU = NewDef; - } - - assert(CurSU && "Unable to resolve live physical register dependencies!"); - } - - // Add the nodes that aren't ready back onto the available list. - for (unsigned i = 0, e = NotReady.size(); i != e; ++i) { - NotReady[i]->isPending = false; - // May no longer be available due to backtracking. - if (NotReady[i]->isAvailable) - AvailableQueue->push(NotReady[i]); + while (AvailableQueue->empty() && !PendingQueue.empty()) { + // Advance the cycle to free resources. Skip ahead to the next ready SU. + assert(MinAvailableCycle < UINT_MAX && "MinAvailableCycle uninitialized"); + AdvanceToCycle(std::max(CurCycle + 1, MinAvailableCycle)); } - NotReady.clear(); - - if (CurSU) - ScheduleNodeBottomUp(CurSU, CurCycle); - ++CurCycle; - AvailableQueue->setCurCycle(CurCycle); } // Reverse the order if it is bottom up. std::reverse(Sequence.begin(), Sequence.end()); - + #ifndef NDEBUG VerifySchedule(isBottomUp); #endif @@ -905,7 +1206,7 @@ void ScheduleDAGRRList::ReleaseSuccessors(SUnit *SU) { /// ScheduleNodeTopDown - Add the node to the schedule. Decrement the pending /// count of its successors. If a successor pending count is zero, add it to /// the Available queue. -void ScheduleDAGRRList::ScheduleNodeTopDown(SUnit *SU, unsigned CurCycle) { +void ScheduleDAGRRList::ScheduleNodeTopDown(SUnit *SU) { DEBUG(dbgs() << "*** Scheduling [" << CurCycle << "]: "); DEBUG(SU->dump(this)); @@ -921,7 +1222,6 @@ void ScheduleDAGRRList::ScheduleNodeTopDown(SUnit *SU, unsigned CurCycle) { /// ListScheduleTopDown - The main loop of list scheduling for top-down /// schedulers. void ScheduleDAGRRList::ListScheduleTopDown() { - unsigned CurCycle = 0; AvailableQueue->setCurCycle(CurCycle); // Release any successors of the special Entry node. @@ -935,19 +1235,19 @@ void ScheduleDAGRRList::ListScheduleTopDown() { SUnits[i].isAvailable = true; } } - + // While Available queue is not empty, grab the node with the highest // priority. If it is not ready put it back. Schedule the node. Sequence.reserve(SUnits.size()); while (!AvailableQueue->empty()) { SUnit *CurSU = AvailableQueue->pop(); - + if (CurSU) - ScheduleNodeTopDown(CurSU, CurCycle); + ScheduleNodeTopDown(CurSU); ++CurCycle; AvailableQueue->setCurCycle(CurCycle); } - + #ifndef NDEBUG VerifySchedule(isBottomUp); #endif @@ -955,70 +1255,288 @@ void ScheduleDAGRRList::ListScheduleTopDown() { //===----------------------------------------------------------------------===// -// RegReductionPriorityQueue Implementation +// RegReductionPriorityQueue Definition //===----------------------------------------------------------------------===// // // This is a SchedulingPriorityQueue that schedules using Sethi Ullman numbers // to reduce register pressure. -// +// namespace { - template<class SF> - class RegReductionPriorityQueue; - - /// bu_ls_rr_sort - Priority function for bottom up register pressure - // reduction scheduler. - struct bu_ls_rr_sort : public std::binary_function<SUnit*, SUnit*, bool> { - RegReductionPriorityQueue<bu_ls_rr_sort> *SPQ; - bu_ls_rr_sort(RegReductionPriorityQueue<bu_ls_rr_sort> *spq) : SPQ(spq) {} - bu_ls_rr_sort(const bu_ls_rr_sort &RHS) : SPQ(RHS.SPQ) {} - - bool operator()(const SUnit* left, const SUnit* right) const; +class RegReductionPQBase; + +struct queue_sort : public std::binary_function<SUnit*, SUnit*, bool> { + bool isReady(SUnit* SU, unsigned CurCycle) const { return true; } +}; + +/// bu_ls_rr_sort - Priority function for bottom up register pressure +// reduction scheduler. +struct bu_ls_rr_sort : public queue_sort { + enum { + IsBottomUp = true, + HasReadyFilter = false }; - // td_ls_rr_sort - Priority function for top down register pressure reduction - // scheduler. - struct td_ls_rr_sort : public std::binary_function<SUnit*, SUnit*, bool> { - RegReductionPriorityQueue<td_ls_rr_sort> *SPQ; - td_ls_rr_sort(RegReductionPriorityQueue<td_ls_rr_sort> *spq) : SPQ(spq) {} - td_ls_rr_sort(const td_ls_rr_sort &RHS) : SPQ(RHS.SPQ) {} - - bool operator()(const SUnit* left, const SUnit* right) const; + RegReductionPQBase *SPQ; + bu_ls_rr_sort(RegReductionPQBase *spq) : SPQ(spq) {} + bu_ls_rr_sort(const bu_ls_rr_sort &RHS) : SPQ(RHS.SPQ) {} + + bool operator()(SUnit* left, SUnit* right) const; +}; + +// td_ls_rr_sort - Priority function for top down register pressure reduction +// scheduler. +struct td_ls_rr_sort : public queue_sort { + enum { + IsBottomUp = false, + HasReadyFilter = false }; - // src_ls_rr_sort - Priority function for source order scheduler. - struct src_ls_rr_sort : public std::binary_function<SUnit*, SUnit*, bool> { - RegReductionPriorityQueue<src_ls_rr_sort> *SPQ; - src_ls_rr_sort(RegReductionPriorityQueue<src_ls_rr_sort> *spq) - : SPQ(spq) {} - src_ls_rr_sort(const src_ls_rr_sort &RHS) - : SPQ(RHS.SPQ) {} - - bool operator()(const SUnit* left, const SUnit* right) const; + RegReductionPQBase *SPQ; + td_ls_rr_sort(RegReductionPQBase *spq) : SPQ(spq) {} + td_ls_rr_sort(const td_ls_rr_sort &RHS) : SPQ(RHS.SPQ) {} + + bool operator()(const SUnit* left, const SUnit* right) const; +}; + +// src_ls_rr_sort - Priority function for source order scheduler. +struct src_ls_rr_sort : public queue_sort { + enum { + IsBottomUp = true, + HasReadyFilter = false }; - // hybrid_ls_rr_sort - Priority function for hybrid scheduler. - struct hybrid_ls_rr_sort : public std::binary_function<SUnit*, SUnit*, bool> { - RegReductionPriorityQueue<hybrid_ls_rr_sort> *SPQ; - hybrid_ls_rr_sort(RegReductionPriorityQueue<hybrid_ls_rr_sort> *spq) - : SPQ(spq) {} - hybrid_ls_rr_sort(const hybrid_ls_rr_sort &RHS) - : SPQ(RHS.SPQ) {} + RegReductionPQBase *SPQ; + src_ls_rr_sort(RegReductionPQBase *spq) + : SPQ(spq) {} + src_ls_rr_sort(const src_ls_rr_sort &RHS) + : SPQ(RHS.SPQ) {} + + bool operator()(SUnit* left, SUnit* right) const; +}; - bool operator()(const SUnit* left, const SUnit* right) const; +// hybrid_ls_rr_sort - Priority function for hybrid scheduler. +struct hybrid_ls_rr_sort : public queue_sort { + enum { + IsBottomUp = true, + HasReadyFilter = true }; - // ilp_ls_rr_sort - Priority function for ILP (instruction level parallelism) - // scheduler. - struct ilp_ls_rr_sort : public std::binary_function<SUnit*, SUnit*, bool> { - RegReductionPriorityQueue<ilp_ls_rr_sort> *SPQ; - ilp_ls_rr_sort(RegReductionPriorityQueue<ilp_ls_rr_sort> *spq) - : SPQ(spq) {} - ilp_ls_rr_sort(const ilp_ls_rr_sort &RHS) - : SPQ(RHS.SPQ) {} + RegReductionPQBase *SPQ; + hybrid_ls_rr_sort(RegReductionPQBase *spq) + : SPQ(spq) {} + hybrid_ls_rr_sort(const hybrid_ls_rr_sort &RHS) + : SPQ(RHS.SPQ) {} + + bool isReady(SUnit *SU, unsigned CurCycle) const; - bool operator()(const SUnit* left, const SUnit* right) const; + bool operator()(SUnit* left, SUnit* right) const; +}; + +// ilp_ls_rr_sort - Priority function for ILP (instruction level parallelism) +// scheduler. +struct ilp_ls_rr_sort : public queue_sort { + enum { + IsBottomUp = true, + HasReadyFilter = true }; -} // end anonymous namespace + + RegReductionPQBase *SPQ; + ilp_ls_rr_sort(RegReductionPQBase *spq) + : SPQ(spq) {} + ilp_ls_rr_sort(const ilp_ls_rr_sort &RHS) + : SPQ(RHS.SPQ) {} + + bool isReady(SUnit *SU, unsigned CurCycle) const; + + bool operator()(SUnit* left, SUnit* right) const; +}; + +class RegReductionPQBase : public SchedulingPriorityQueue { +protected: + std::vector<SUnit*> Queue; + unsigned CurQueueId; + bool TracksRegPressure; + + // SUnits - The SUnits for the current graph. + std::vector<SUnit> *SUnits; + + MachineFunction &MF; + const TargetInstrInfo *TII; + const TargetRegisterInfo *TRI; + const TargetLowering *TLI; + ScheduleDAGRRList *scheduleDAG; + + // SethiUllmanNumbers - The SethiUllman number for each node. + std::vector<unsigned> SethiUllmanNumbers; + + /// RegPressure - Tracking current reg pressure per register class. + /// + std::vector<unsigned> RegPressure; + + /// RegLimit - Tracking the number of allocatable registers per register + /// class. + std::vector<unsigned> RegLimit; + +public: + RegReductionPQBase(MachineFunction &mf, + bool hasReadyFilter, + bool tracksrp, + const TargetInstrInfo *tii, + const TargetRegisterInfo *tri, + const TargetLowering *tli) + : SchedulingPriorityQueue(hasReadyFilter), + CurQueueId(0), TracksRegPressure(tracksrp), + MF(mf), TII(tii), TRI(tri), TLI(tli), scheduleDAG(NULL) { + if (TracksRegPressure) { + unsigned NumRC = TRI->getNumRegClasses(); + RegLimit.resize(NumRC); + RegPressure.resize(NumRC); + std::fill(RegLimit.begin(), RegLimit.end(), 0); + std::fill(RegPressure.begin(), RegPressure.end(), 0); + for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(), + E = TRI->regclass_end(); I != E; ++I) + RegLimit[(*I)->getID()] = tli->getRegPressureLimit(*I, MF); + } + } + + void setScheduleDAG(ScheduleDAGRRList *scheduleDag) { + scheduleDAG = scheduleDag; + } + + ScheduleHazardRecognizer* getHazardRec() { + return scheduleDAG->getHazardRec(); + } + + void initNodes(std::vector<SUnit> &sunits); + + void addNode(const SUnit *SU); + + void updateNode(const SUnit *SU); + + void releaseState() { + SUnits = 0; + SethiUllmanNumbers.clear(); + std::fill(RegPressure.begin(), RegPressure.end(), 0); + } + + unsigned getNodePriority(const SUnit *SU) const; + + unsigned getNodeOrdering(const SUnit *SU) const { + return scheduleDAG->DAG->GetOrdering(SU->getNode()); + } + + bool empty() const { return Queue.empty(); } + + void push(SUnit *U) { + assert(!U->NodeQueueId && "Node in the queue already"); + U->NodeQueueId = ++CurQueueId; + Queue.push_back(U); + } + + void remove(SUnit *SU) { + assert(!Queue.empty() && "Queue is empty!"); + assert(SU->NodeQueueId != 0 && "Not in queue!"); + std::vector<SUnit *>::iterator I = std::find(Queue.begin(), Queue.end(), + SU); + if (I != prior(Queue.end())) + std::swap(*I, Queue.back()); + Queue.pop_back(); + SU->NodeQueueId = 0; + } + + bool tracksRegPressure() const { return TracksRegPressure; } + + void dumpRegPressure() const; + + bool HighRegPressure(const SUnit *SU) const; + + bool MayReduceRegPressure(SUnit *SU); + + void ScheduledNode(SUnit *SU); + + void UnscheduledNode(SUnit *SU); + +protected: + bool canClobber(const SUnit *SU, const SUnit *Op); + void AddPseudoTwoAddrDeps(); + void PrescheduleNodesWithMultipleUses(); + void CalculateSethiUllmanNumbers(); +}; + +template<class SF> +class RegReductionPriorityQueue : public RegReductionPQBase { + static SUnit *popFromQueue(std::vector<SUnit*> &Q, SF &Picker) { + std::vector<SUnit *>::iterator Best = Q.begin(); + for (std::vector<SUnit *>::iterator I = llvm::next(Q.begin()), + E = Q.end(); I != E; ++I) + if (Picker(*Best, *I)) + Best = I; + SUnit *V = *Best; + if (Best != prior(Q.end())) + std::swap(*Best, Q.back()); + Q.pop_back(); + return V; + } + + SF Picker; + +public: + RegReductionPriorityQueue(MachineFunction &mf, + bool tracksrp, + const TargetInstrInfo *tii, + const TargetRegisterInfo *tri, + const TargetLowering *tli) + : RegReductionPQBase(mf, SF::HasReadyFilter, tracksrp, tii, tri, tli), + Picker(this) {} + + bool isBottomUp() const { return SF::IsBottomUp; } + + bool isReady(SUnit *U) const { + return Picker.HasReadyFilter && Picker.isReady(U, getCurCycle()); + } + + SUnit *pop() { + if (Queue.empty()) return NULL; + + SUnit *V = popFromQueue(Queue, Picker); + V->NodeQueueId = 0; + return V; + } + + void dump(ScheduleDAG *DAG) const { + // Emulate pop() without clobbering NodeQueueIds. + std::vector<SUnit*> DumpQueue = Queue; + SF DumpPicker = Picker; + while (!DumpQueue.empty()) { + SUnit *SU = popFromQueue(DumpQueue, DumpPicker); + if (isBottomUp()) + dbgs() << "Height " << SU->getHeight() << ": "; + else + dbgs() << "Depth " << SU->getDepth() << ": "; + SU->dump(DAG); + } + } +}; + +typedef RegReductionPriorityQueue<bu_ls_rr_sort> +BURegReductionPriorityQueue; + +typedef RegReductionPriorityQueue<td_ls_rr_sort> +TDRegReductionPriorityQueue; + +typedef RegReductionPriorityQueue<src_ls_rr_sort> +SrcRegReductionPriorityQueue; + +typedef RegReductionPriorityQueue<hybrid_ls_rr_sort> +HybridBURRPriorityQueue; + +typedef RegReductionPriorityQueue<ilp_ls_rr_sort> +ILPBURRPriorityQueue; +} // end anonymous namespace + +//===----------------------------------------------------------------------===// +// Static Node Priority for Register Pressure Reduction +//===----------------------------------------------------------------------===// /// CalcNodeSethiUllmanNumber - Compute Sethi Ullman number. /// Smaller number is the higher priority. @@ -1045,413 +1563,283 @@ CalcNodeSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) { if (SethiUllmanNumber == 0) SethiUllmanNumber = 1; - + return SethiUllmanNumber; } -namespace { - template<class SF> - class RegReductionPriorityQueue : public SchedulingPriorityQueue { - std::vector<SUnit*> Queue; - SF Picker; - unsigned CurQueueId; - bool TracksRegPressure; - - protected: - // SUnits - The SUnits for the current graph. - std::vector<SUnit> *SUnits; - - MachineFunction &MF; - const TargetInstrInfo *TII; - const TargetRegisterInfo *TRI; - const TargetLowering *TLI; - ScheduleDAGRRList *scheduleDAG; - - // SethiUllmanNumbers - The SethiUllman number for each node. - std::vector<unsigned> SethiUllmanNumbers; - - /// RegPressure - Tracking current reg pressure per register class. - /// - std::vector<unsigned> RegPressure; - - /// RegLimit - Tracking the number of allocatable registers per register - /// class. - std::vector<unsigned> RegLimit; - - public: - RegReductionPriorityQueue(MachineFunction &mf, - bool tracksrp, - const TargetInstrInfo *tii, - const TargetRegisterInfo *tri, - const TargetLowering *tli) - : Picker(this), CurQueueId(0), TracksRegPressure(tracksrp), - MF(mf), TII(tii), TRI(tri), TLI(tli), scheduleDAG(NULL) { - if (TracksRegPressure) { - unsigned NumRC = TRI->getNumRegClasses(); - RegLimit.resize(NumRC); - RegPressure.resize(NumRC); - std::fill(RegLimit.begin(), RegLimit.end(), 0); - std::fill(RegPressure.begin(), RegPressure.end(), 0); - for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(), - E = TRI->regclass_end(); I != E; ++I) - RegLimit[(*I)->getID()] = tli->getRegPressureLimit(*I, MF); - } - } - - void initNodes(std::vector<SUnit> &sunits) { - SUnits = &sunits; - // Add pseudo dependency edges for two-address nodes. - AddPseudoTwoAddrDeps(); - // Reroute edges to nodes with multiple uses. - PrescheduleNodesWithMultipleUses(); - // Calculate node priorities. - CalculateSethiUllmanNumbers(); - } - - void addNode(const SUnit *SU) { - unsigned SUSize = SethiUllmanNumbers.size(); - if (SUnits->size() > SUSize) - SethiUllmanNumbers.resize(SUSize*2, 0); - CalcNodeSethiUllmanNumber(SU, SethiUllmanNumbers); - } - - void updateNode(const SUnit *SU) { - SethiUllmanNumbers[SU->NodeNum] = 0; - CalcNodeSethiUllmanNumber(SU, SethiUllmanNumbers); - } +/// CalculateSethiUllmanNumbers - Calculate Sethi-Ullman numbers of all +/// scheduling units. +void RegReductionPQBase::CalculateSethiUllmanNumbers() { + SethiUllmanNumbers.assign(SUnits->size(), 0); - void releaseState() { - SUnits = 0; - SethiUllmanNumbers.clear(); - std::fill(RegPressure.begin(), RegPressure.end(), 0); - } + for (unsigned i = 0, e = SUnits->size(); i != e; ++i) + CalcNodeSethiUllmanNumber(&(*SUnits)[i], SethiUllmanNumbers); +} - unsigned getNodePriority(const SUnit *SU) const { - assert(SU->NodeNum < SethiUllmanNumbers.size()); - unsigned Opc = SU->getNode() ? SU->getNode()->getOpcode() : 0; - if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg) - // CopyToReg should be close to its uses to facilitate coalescing and - // avoid spilling. - return 0; - if (Opc == TargetOpcode::EXTRACT_SUBREG || - Opc == TargetOpcode::SUBREG_TO_REG || - Opc == TargetOpcode::INSERT_SUBREG) - // EXTRACT_SUBREG, INSERT_SUBREG, and SUBREG_TO_REG nodes should be - // close to their uses to facilitate coalescing. - return 0; - if (SU->NumSuccs == 0 && SU->NumPreds != 0) - // If SU does not have a register use, i.e. it doesn't produce a value - // that would be consumed (e.g. store), then it terminates a chain of - // computation. Give it a large SethiUllman number so it will be - // scheduled right before its predecessors that it doesn't lengthen - // their live ranges. - return 0xffff; - if (SU->NumPreds == 0 && SU->NumSuccs != 0) - // If SU does not have a register def, schedule it close to its uses - // because it does not lengthen any live ranges. - return 0; - return SethiUllmanNumbers[SU->NodeNum]; - } +void RegReductionPQBase::initNodes(std::vector<SUnit> &sunits) { + SUnits = &sunits; + // Add pseudo dependency edges for two-address nodes. + AddPseudoTwoAddrDeps(); + // Reroute edges to nodes with multiple uses. + if (!TracksRegPressure) + PrescheduleNodesWithMultipleUses(); + // Calculate node priorities. + CalculateSethiUllmanNumbers(); +} - unsigned getNodeOrdering(const SUnit *SU) const { - return scheduleDAG->DAG->GetOrdering(SU->getNode()); - } +void RegReductionPQBase::addNode(const SUnit *SU) { + unsigned SUSize = SethiUllmanNumbers.size(); + if (SUnits->size() > SUSize) + SethiUllmanNumbers.resize(SUSize*2, 0); + CalcNodeSethiUllmanNumber(SU, SethiUllmanNumbers); +} - bool empty() const { return Queue.empty(); } - - void push(SUnit *U) { - assert(!U->NodeQueueId && "Node in the queue already"); - U->NodeQueueId = ++CurQueueId; - Queue.push_back(U); - } +void RegReductionPQBase::updateNode(const SUnit *SU) { + SethiUllmanNumbers[SU->NodeNum] = 0; + CalcNodeSethiUllmanNumber(SU, SethiUllmanNumbers); +} - SUnit *pop() { - if (empty()) return NULL; - std::vector<SUnit *>::iterator Best = Queue.begin(); - for (std::vector<SUnit *>::iterator I = llvm::next(Queue.begin()), - E = Queue.end(); I != E; ++I) - if (Picker(*Best, *I)) - Best = I; - SUnit *V = *Best; - if (Best != prior(Queue.end())) - std::swap(*Best, Queue.back()); - Queue.pop_back(); - V->NodeQueueId = 0; - return V; - } +// Lower priority means schedule further down. For bottom-up scheduling, lower +// priority SUs are scheduled before higher priority SUs. +unsigned RegReductionPQBase::getNodePriority(const SUnit *SU) const { + assert(SU->NodeNum < SethiUllmanNumbers.size()); + unsigned Opc = SU->getNode() ? SU->getNode()->getOpcode() : 0; + if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg) + // CopyToReg should be close to its uses to facilitate coalescing and + // avoid spilling. + return 0; + if (Opc == TargetOpcode::EXTRACT_SUBREG || + Opc == TargetOpcode::SUBREG_TO_REG || + Opc == TargetOpcode::INSERT_SUBREG) + // EXTRACT_SUBREG, INSERT_SUBREG, and SUBREG_TO_REG nodes should be + // close to their uses to facilitate coalescing. + return 0; + if (SU->NumSuccs == 0 && SU->NumPreds != 0) + // If SU does not have a register use, i.e. it doesn't produce a value + // that would be consumed (e.g. store), then it terminates a chain of + // computation. Give it a large SethiUllman number so it will be + // scheduled right before its predecessors that it doesn't lengthen + // their live ranges. + return 0xffff; + if (SU->NumPreds == 0 && SU->NumSuccs != 0) + // If SU does not have a register def, schedule it close to its uses + // because it does not lengthen any live ranges. + return 0; + return SethiUllmanNumbers[SU->NodeNum]; +} - void remove(SUnit *SU) { - assert(!Queue.empty() && "Queue is empty!"); - assert(SU->NodeQueueId != 0 && "Not in queue!"); - std::vector<SUnit *>::iterator I = std::find(Queue.begin(), Queue.end(), - SU); - if (I != prior(Queue.end())) - std::swap(*I, Queue.back()); - Queue.pop_back(); - SU->NodeQueueId = 0; - } +//===----------------------------------------------------------------------===// +// Register Pressure Tracking +//===----------------------------------------------------------------------===// - bool HighRegPressure(const SUnit *SU) const { - if (!TLI) - return false; +void RegReductionPQBase::dumpRegPressure() const { + for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(), + E = TRI->regclass_end(); I != E; ++I) { + const TargetRegisterClass *RC = *I; + unsigned Id = RC->getID(); + unsigned RP = RegPressure[Id]; + if (!RP) continue; + DEBUG(dbgs() << RC->getName() << ": " << RP << " / " << RegLimit[Id] + << '\n'); + } +} - for (SUnit::const_pred_iterator I = SU->Preds.begin(),E = SU->Preds.end(); - I != E; ++I) { - if (I->isCtrl()) - continue; - SUnit *PredSU = I->getSUnit(); - const SDNode *PN = PredSU->getNode(); - if (!PN->isMachineOpcode()) { - if (PN->getOpcode() == ISD::CopyFromReg) { - EVT VT = PN->getValueType(0); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - unsigned Cost = TLI->getRepRegClassCostFor(VT); - if ((RegPressure[RCId] + Cost) >= RegLimit[RCId]) - return true; - } - continue; - } - unsigned POpc = PN->getMachineOpcode(); - if (POpc == TargetOpcode::IMPLICIT_DEF) - continue; - if (POpc == TargetOpcode::EXTRACT_SUBREG) { - EVT VT = PN->getOperand(0).getValueType(); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - unsigned Cost = TLI->getRepRegClassCostFor(VT); - // Check if this increases register pressure of the specific register - // class to the point where it would cause spills. - if ((RegPressure[RCId] + Cost) >= RegLimit[RCId]) - return true; - continue; - } else if (POpc == TargetOpcode::INSERT_SUBREG || - POpc == TargetOpcode::SUBREG_TO_REG) { - EVT VT = PN->getValueType(0); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - unsigned Cost = TLI->getRepRegClassCostFor(VT); - // Check if this increases register pressure of the specific register - // class to the point where it would cause spills. - if ((RegPressure[RCId] + Cost) >= RegLimit[RCId]) - return true; - continue; - } - unsigned NumDefs = TII->get(PN->getMachineOpcode()).getNumDefs(); - for (unsigned i = 0; i != NumDefs; ++i) { - EVT VT = PN->getValueType(i); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - if (RegPressure[RCId] >= RegLimit[RCId]) - return true; // Reg pressure already high. - unsigned Cost = TLI->getRepRegClassCostFor(VT); - if (!PN->hasAnyUseOfValue(i)) - continue; - // Check if this increases register pressure of the specific register - // class to the point where it would cause spills. - if ((RegPressure[RCId] + Cost) >= RegLimit[RCId]) - return true; - } - } +bool RegReductionPQBase::HighRegPressure(const SUnit *SU) const { + if (!TLI) + return false; - return false; + for (SUnit::const_pred_iterator I = SU->Preds.begin(),E = SU->Preds.end(); + I != E; ++I) { + if (I->isCtrl()) + continue; + SUnit *PredSU = I->getSUnit(); + // NumRegDefsLeft is zero when enough uses of this node have been scheduled + // to cover the number of registers defined (they are all live). + if (PredSU->NumRegDefsLeft == 0) { + continue; + } + for (ScheduleDAGSDNodes::RegDefIter RegDefPos(PredSU, scheduleDAG); + RegDefPos.IsValid(); RegDefPos.Advance()) { + EVT VT = RegDefPos.GetValue(); + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + unsigned Cost = TLI->getRepRegClassCostFor(VT); + if ((RegPressure[RCId] + Cost) >= RegLimit[RCId]) + return true; } + } + return false; +} - void ScheduledNode(SUnit *SU) { - if (!TracksRegPressure) - return; - - const SDNode *N = SU->getNode(); - if (!N->isMachineOpcode()) { - if (N->getOpcode() != ISD::CopyToReg) - return; - } else { - unsigned Opc = N->getMachineOpcode(); - if (Opc == TargetOpcode::EXTRACT_SUBREG || - Opc == TargetOpcode::INSERT_SUBREG || - Opc == TargetOpcode::SUBREG_TO_REG || - Opc == TargetOpcode::REG_SEQUENCE || - Opc == TargetOpcode::IMPLICIT_DEF) - return; - } +bool RegReductionPQBase::MayReduceRegPressure(SUnit *SU) { + const SDNode *N = SU->getNode(); - for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); - I != E; ++I) { - if (I->isCtrl()) - continue; - SUnit *PredSU = I->getSUnit(); - if (PredSU->NumSuccsLeft != PredSU->NumSuccs) - continue; - const SDNode *PN = PredSU->getNode(); - if (!PN->isMachineOpcode()) { - if (PN->getOpcode() == ISD::CopyFromReg) { - EVT VT = PN->getValueType(0); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - } - continue; - } - unsigned POpc = PN->getMachineOpcode(); - if (POpc == TargetOpcode::IMPLICIT_DEF) - continue; - if (POpc == TargetOpcode::EXTRACT_SUBREG) { - EVT VT = PN->getOperand(0).getValueType(); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - continue; - } else if (POpc == TargetOpcode::INSERT_SUBREG || - POpc == TargetOpcode::SUBREG_TO_REG) { - EVT VT = PN->getValueType(0); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - continue; - } - unsigned NumDefs = TII->get(PN->getMachineOpcode()).getNumDefs(); - for (unsigned i = 0; i != NumDefs; ++i) { - EVT VT = PN->getValueType(i); - if (!PN->hasAnyUseOfValue(i)) - continue; - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - } - } + if (!N->isMachineOpcode() || !SU->NumSuccs) + return false; - // Check for isMachineOpcode() as PrescheduleNodesWithMultipleUses() - // may transfer data dependencies to CopyToReg. - if (SU->NumSuccs && N->isMachineOpcode()) { - unsigned NumDefs = TII->get(N->getMachineOpcode()).getNumDefs(); - for (unsigned i = 0; i != NumDefs; ++i) { - EVT VT = N->getValueType(i); - if (!N->hasAnyUseOfValue(i)) - continue; - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - if (RegPressure[RCId] < TLI->getRepRegClassCostFor(VT)) - // Register pressure tracking is imprecise. This can happen. - RegPressure[RCId] = 0; - else - RegPressure[RCId] -= TLI->getRepRegClassCostFor(VT); - } - } + unsigned NumDefs = TII->get(N->getMachineOpcode()).getNumDefs(); + for (unsigned i = 0; i != NumDefs; ++i) { + EVT VT = N->getValueType(i); + if (!N->hasAnyUseOfValue(i)) + continue; + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + if (RegPressure[RCId] >= RegLimit[RCId]) + return true; + } + return false; +} + +void RegReductionPQBase::ScheduledNode(SUnit *SU) { + if (!TracksRegPressure) + return; - dumpRegPressure(); + for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); + I != E; ++I) { + if (I->isCtrl()) + continue; + SUnit *PredSU = I->getSUnit(); + // NumRegDefsLeft is zero when enough uses of this node have been scheduled + // to cover the number of registers defined (they are all live). + if (PredSU->NumRegDefsLeft == 0) { + continue; + } + // FIXME: The ScheduleDAG currently loses information about which of a + // node's values is consumed by each dependence. Consequently, if the node + // defines multiple register classes, we don't know which to pressurize + // here. Instead the following loop consumes the register defs in an + // arbitrary order. At least it handles the common case of clustered loads + // to the same class. For precise liveness, each SDep needs to indicate the + // result number. But that tightly couples the ScheduleDAG with the + // SelectionDAG making updates tricky. A simpler hack would be to attach a + // value type or register class to SDep. + // + // The most important aspect of register tracking is balancing the increase + // here with the reduction further below. Note that this SU may use multiple + // defs in PredSU. The can't be determined here, but we've already + // compensated by reducing NumRegDefsLeft in PredSU during + // ScheduleDAGSDNodes::AddSchedEdges. + --PredSU->NumRegDefsLeft; + unsigned SkipRegDefs = PredSU->NumRegDefsLeft; + for (ScheduleDAGSDNodes::RegDefIter RegDefPos(PredSU, scheduleDAG); + RegDefPos.IsValid(); RegDefPos.Advance(), --SkipRegDefs) { + if (SkipRegDefs) + continue; + EVT VT = RegDefPos.GetValue(); + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); + break; } + } - void UnscheduledNode(SUnit *SU) { - if (!TracksRegPressure) - return; - - const SDNode *N = SU->getNode(); - if (!N->isMachineOpcode()) { - if (N->getOpcode() != ISD::CopyToReg) - return; - } else { - unsigned Opc = N->getMachineOpcode(); - if (Opc == TargetOpcode::EXTRACT_SUBREG || - Opc == TargetOpcode::INSERT_SUBREG || - Opc == TargetOpcode::SUBREG_TO_REG || - Opc == TargetOpcode::REG_SEQUENCE || - Opc == TargetOpcode::IMPLICIT_DEF) - return; - } + // We should have this assert, but there may be dead SDNodes that never + // materialize as SUnits, so they don't appear to generate liveness. + //assert(SU->NumRegDefsLeft == 0 && "not all regdefs have scheduled uses"); + int SkipRegDefs = (int)SU->NumRegDefsLeft; + for (ScheduleDAGSDNodes::RegDefIter RegDefPos(SU, scheduleDAG); + RegDefPos.IsValid(); RegDefPos.Advance(), --SkipRegDefs) { + if (SkipRegDefs > 0) + continue; + EVT VT = RegDefPos.GetValue(); + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + if (RegPressure[RCId] < TLI->getRepRegClassCostFor(VT)) { + // Register pressure tracking is imprecise. This can happen. But we try + // hard not to let it happen because it likely results in poor scheduling. + DEBUG(dbgs() << " SU(" << SU->NodeNum << ") has too many regdefs\n"); + RegPressure[RCId] = 0; + } + else { + RegPressure[RCId] -= TLI->getRepRegClassCostFor(VT); + } + } + dumpRegPressure(); +} - for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); - I != E; ++I) { - if (I->isCtrl()) - continue; - SUnit *PredSU = I->getSUnit(); - if (PredSU->NumSuccsLeft != PredSU->NumSuccs) - continue; - const SDNode *PN = PredSU->getNode(); - if (!PN->isMachineOpcode()) { - if (PN->getOpcode() == ISD::CopyFromReg) { - EVT VT = PN->getValueType(0); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - } - continue; - } - unsigned POpc = PN->getMachineOpcode(); - if (POpc == TargetOpcode::IMPLICIT_DEF) - continue; - if (POpc == TargetOpcode::EXTRACT_SUBREG) { - EVT VT = PN->getOperand(0).getValueType(); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - continue; - } else if (POpc == TargetOpcode::INSERT_SUBREG || - POpc == TargetOpcode::SUBREG_TO_REG) { - EVT VT = PN->getValueType(0); - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - continue; - } - unsigned NumDefs = TII->get(PN->getMachineOpcode()).getNumDefs(); - for (unsigned i = 0; i != NumDefs; ++i) { - EVT VT = PN->getValueType(i); - if (!PN->hasAnyUseOfValue(i)) - continue; - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - if (RegPressure[RCId] < TLI->getRepRegClassCostFor(VT)) - // Register pressure tracking is imprecise. This can happen. - RegPressure[RCId] = 0; - else - RegPressure[RCId] -= TLI->getRepRegClassCostFor(VT); - } - } +void RegReductionPQBase::UnscheduledNode(SUnit *SU) { + if (!TracksRegPressure) + return; + + const SDNode *N = SU->getNode(); + if (!N->isMachineOpcode()) { + if (N->getOpcode() != ISD::CopyToReg) + return; + } else { + unsigned Opc = N->getMachineOpcode(); + if (Opc == TargetOpcode::EXTRACT_SUBREG || + Opc == TargetOpcode::INSERT_SUBREG || + Opc == TargetOpcode::SUBREG_TO_REG || + Opc == TargetOpcode::REG_SEQUENCE || + Opc == TargetOpcode::IMPLICIT_DEF) + return; + } - // Check for isMachineOpcode() as PrescheduleNodesWithMultipleUses() - // may transfer data dependencies to CopyToReg. - if (SU->NumSuccs && N->isMachineOpcode()) { - unsigned NumDefs = TII->get(N->getMachineOpcode()).getNumDefs(); - for (unsigned i = NumDefs, e = N->getNumValues(); i != e; ++i) { - EVT VT = N->getValueType(i); - if (VT == MVT::Flag || VT == MVT::Other) - continue; - if (!N->hasAnyUseOfValue(i)) - continue; - unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); - RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); - } + for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end(); + I != E; ++I) { + if (I->isCtrl()) + continue; + SUnit *PredSU = I->getSUnit(); + // NumSuccsLeft counts all deps. Don't compare it with NumSuccs which only + // counts data deps. + if (PredSU->NumSuccsLeft != PredSU->Succs.size()) + continue; + const SDNode *PN = PredSU->getNode(); + if (!PN->isMachineOpcode()) { + if (PN->getOpcode() == ISD::CopyFromReg) { + EVT VT = PN->getValueType(0); + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); } - - dumpRegPressure(); + continue; } - - void setScheduleDAG(ScheduleDAGRRList *scheduleDag) { - scheduleDAG = scheduleDag; + unsigned POpc = PN->getMachineOpcode(); + if (POpc == TargetOpcode::IMPLICIT_DEF) + continue; + if (POpc == TargetOpcode::EXTRACT_SUBREG) { + EVT VT = PN->getOperand(0).getValueType(); + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); + continue; + } else if (POpc == TargetOpcode::INSERT_SUBREG || + POpc == TargetOpcode::SUBREG_TO_REG) { + EVT VT = PN->getValueType(0); + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); + continue; } - - void dumpRegPressure() const { - for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(), - E = TRI->regclass_end(); I != E; ++I) { - const TargetRegisterClass *RC = *I; - unsigned Id = RC->getID(); - unsigned RP = RegPressure[Id]; - if (!RP) continue; - DEBUG(dbgs() << RC->getName() << ": " << RP << " / " << RegLimit[Id] - << '\n'); - } + unsigned NumDefs = TII->get(PN->getMachineOpcode()).getNumDefs(); + for (unsigned i = 0; i != NumDefs; ++i) { + EVT VT = PN->getValueType(i); + if (!PN->hasAnyUseOfValue(i)) + continue; + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + if (RegPressure[RCId] < TLI->getRepRegClassCostFor(VT)) + // Register pressure tracking is imprecise. This can happen. + RegPressure[RCId] = 0; + else + RegPressure[RCId] -= TLI->getRepRegClassCostFor(VT); } + } - protected: - bool canClobber(const SUnit *SU, const SUnit *Op); - void AddPseudoTwoAddrDeps(); - void PrescheduleNodesWithMultipleUses(); - void CalculateSethiUllmanNumbers(); - }; - - typedef RegReductionPriorityQueue<bu_ls_rr_sort> - BURegReductionPriorityQueue; - - typedef RegReductionPriorityQueue<td_ls_rr_sort> - TDRegReductionPriorityQueue; - - typedef RegReductionPriorityQueue<src_ls_rr_sort> - SrcRegReductionPriorityQueue; - - typedef RegReductionPriorityQueue<hybrid_ls_rr_sort> - HybridBURRPriorityQueue; + // Check for isMachineOpcode() as PrescheduleNodesWithMultipleUses() + // may transfer data dependencies to CopyToReg. + if (SU->NumSuccs && N->isMachineOpcode()) { + unsigned NumDefs = TII->get(N->getMachineOpcode()).getNumDefs(); + for (unsigned i = NumDefs, e = N->getNumValues(); i != e; ++i) { + EVT VT = N->getValueType(i); + if (VT == MVT::Glue || VT == MVT::Other) + continue; + if (!N->hasAnyUseOfValue(i)) + continue; + unsigned RCId = TLI->getRepRegClassFor(VT)->getID(); + RegPressure[RCId] += TLI->getRepRegClassCostFor(VT); + } + } - typedef RegReductionPriorityQueue<ilp_ls_rr_sort> - ILPBURRPriorityQueue; + dumpRegPressure(); } +//===----------------------------------------------------------------------===// +// Dynamic Node Priority for Register Pressure Reduction +//===----------------------------------------------------------------------===// + /// closestSucc - Returns the scheduled cycle of the successor which is /// closest to the current cycle. static unsigned closestSucc(const SUnit *SU) { @@ -1483,9 +1871,123 @@ static unsigned calcMaxScratches(const SUnit *SU) { return Scratches; } -template <typename RRSort> -static bool BURRSort(const SUnit *left, const SUnit *right, - const RegReductionPriorityQueue<RRSort> *SPQ) { +/// hasOnlyLiveOutUse - Return true if SU has a single value successor that is a +/// CopyToReg to a virtual register. This SU def is probably a liveout and +/// it has no other use. It should be scheduled closer to the terminator. +static bool hasOnlyLiveOutUses(const SUnit *SU) { + bool RetVal = false; + for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end(); + I != E; ++I) { + if (I->isCtrl()) continue; + const SUnit *SuccSU = I->getSUnit(); + if (SuccSU->getNode() && SuccSU->getNode()->getOpcode() == ISD::CopyToReg) { + unsigned Reg = + cast<RegisterSDNode>(SuccSU->getNode()->getOperand(1))->getReg(); + if (TargetRegisterInfo::isVirtualRegister(Reg)) { + RetVal = true; + continue; + } + } + return false; + } + return RetVal; +} + +/// UnitsSharePred - Return true if the two scheduling units share a common +/// data predecessor. +static bool UnitsSharePred(const SUnit *left, const SUnit *right) { + SmallSet<const SUnit*, 4> Preds; + for (SUnit::const_pred_iterator I = left->Preds.begin(),E = left->Preds.end(); + I != E; ++I) { + if (I->isCtrl()) continue; // ignore chain preds + Preds.insert(I->getSUnit()); + } + for (SUnit::const_pred_iterator I = right->Preds.begin(),E = right->Preds.end(); + I != E; ++I) { + if (I->isCtrl()) continue; // ignore chain preds + if (Preds.count(I->getSUnit())) + return true; + } + return false; +} + +// Check for either a dependence (latency) or resource (hazard) stall. +// +// Note: The ScheduleHazardRecognizer interface requires a non-const SU. +static bool BUHasStall(SUnit *SU, int Height, RegReductionPQBase *SPQ) { + if ((int)SPQ->getCurCycle() < Height) return true; + if (SPQ->getHazardRec()->getHazardType(SU, 0) + != ScheduleHazardRecognizer::NoHazard) + return true; + return false; +} + +// Return -1 if left has higher priority, 1 if right has higher priority. +// Return 0 if latency-based priority is equivalent. +static int BUCompareLatency(SUnit *left, SUnit *right, bool checkPref, + RegReductionPQBase *SPQ) { + // If the two nodes share an operand and one of them has a single + // use that is a live out copy, favor the one that is live out. Otherwise + // it will be difficult to eliminate the copy if the instruction is a + // loop induction variable update. e.g. + // BB: + // sub r1, r3, #1 + // str r0, [r2, r3] + // mov r3, r1 + // cmp + // bne BB + bool SharePred = UnitsSharePred(left, right); + // FIXME: Only adjust if BB is a loop back edge. + // FIXME: What's the cost of a copy? + int LBonus = (SharePred && hasOnlyLiveOutUses(left)) ? 1 : 0; + int RBonus = (SharePred && hasOnlyLiveOutUses(right)) ? 1 : 0; + int LHeight = (int)left->getHeight() - LBonus; + int RHeight = (int)right->getHeight() - RBonus; + + bool LStall = (!checkPref || left->SchedulingPref == Sched::Latency) && + BUHasStall(left, LHeight, SPQ); + bool RStall = (!checkPref || right->SchedulingPref == Sched::Latency) && + BUHasStall(right, RHeight, SPQ); + + // If scheduling one of the node will cause a pipeline stall, delay it. + // If scheduling either one of the node will cause a pipeline stall, sort + // them according to their height. + if (LStall) { + if (!RStall) + return 1; + if (LHeight != RHeight) + return LHeight > RHeight ? 1 : -1; + } else if (RStall) + return -1; + + // If either node is scheduling for latency, sort them by height/depth + // and latency. + if (!checkPref || (left->SchedulingPref == Sched::Latency || + right->SchedulingPref == Sched::Latency)) { + if (DisableSchedCycles) { + if (LHeight != RHeight) + return LHeight > RHeight ? 1 : -1; + } + else { + // If neither instruction stalls (!LStall && !RStall) then + // it's height is already covered so only its depth matters. We also reach + // this if both stall but have the same height. + unsigned LDepth = left->getDepth(); + unsigned RDepth = right->getDepth(); + if (LDepth != RDepth) { + DEBUG(dbgs() << " Comparing latency of SU (" << left->NodeNum + << ") depth " << LDepth << " vs SU (" << right->NodeNum + << ") depth " << RDepth << "\n"); + return LDepth < RDepth ? 1 : -1; + } + } + if (left->Latency != right->Latency) + return left->Latency > right->Latency ? 1 : -1; + } + return 0; +} + +static bool BURRSort(SUnit *left, SUnit *right, RegReductionPQBase *SPQ) { unsigned LPriority = SPQ->getNodePriority(left); unsigned RPriority = SPQ->getNodePriority(right); if (LPriority != RPriority) @@ -1519,24 +2021,31 @@ static bool BURRSort(const SUnit *left, const SUnit *right, if (LScratch != RScratch) return LScratch > RScratch; - if (left->getHeight() != right->getHeight()) - return left->getHeight() > right->getHeight(); - - if (left->getDepth() != right->getDepth()) - return left->getDepth() < right->getDepth(); + if (!DisableSchedCycles) { + int result = BUCompareLatency(left, right, false /*checkPref*/, SPQ); + if (result != 0) + return result > 0; + } + else { + if (left->getHeight() != right->getHeight()) + return left->getHeight() > right->getHeight(); - assert(left->NodeQueueId && right->NodeQueueId && + if (left->getDepth() != right->getDepth()) + return left->getDepth() < right->getDepth(); + } + + assert(left->NodeQueueId && right->NodeQueueId && "NodeQueueId cannot be zero"); return (left->NodeQueueId > right->NodeQueueId); } // Bottom up -bool bu_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const { +bool bu_ls_rr_sort::operator()(SUnit *left, SUnit *right) const { return BURRSort(left, right, SPQ); } // Source order, otherwise bottom up. -bool src_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const { +bool src_ls_rr_sort::operator()(SUnit *left, SUnit *right) const { unsigned LOrder = SPQ->getNodeOrdering(left); unsigned ROrder = SPQ->getNodeOrdering(right); @@ -1548,49 +2057,69 @@ bool src_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const { return BURRSort(left, right, SPQ); } -bool hybrid_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const{ +// If the time between now and when the instruction will be ready can cover +// the spill code, then avoid adding it to the ready queue. This gives long +// stalls highest priority and allows hoisting across calls. It should also +// speed up processing the available queue. +bool hybrid_ls_rr_sort::isReady(SUnit *SU, unsigned CurCycle) const { + static const unsigned ReadyDelay = 3; + + if (SPQ->MayReduceRegPressure(SU)) return true; + + if (SU->getHeight() > (CurCycle + ReadyDelay)) return false; + + if (SPQ->getHazardRec()->getHazardType(SU, -ReadyDelay) + != ScheduleHazardRecognizer::NoHazard) + return false; + + return true; +} + +// Return true if right should be scheduled with higher priority than left. +bool hybrid_ls_rr_sort::operator()(SUnit *left, SUnit *right) const { + if (left->isCall || right->isCall) + // No way to compute latency of calls. + return BURRSort(left, right, SPQ); + bool LHigh = SPQ->HighRegPressure(left); bool RHigh = SPQ->HighRegPressure(right); // Avoid causing spills. If register pressure is high, schedule for // register pressure reduction. - if (LHigh && !RHigh) + if (LHigh && !RHigh) { + DEBUG(dbgs() << " pressure SU(" << left->NodeNum << ") > SU(" + << right->NodeNum << ")\n"); return true; - else if (!LHigh && RHigh) + } + else if (!LHigh && RHigh) { + DEBUG(dbgs() << " pressure SU(" << right->NodeNum << ") > SU(" + << left->NodeNum << ")\n"); return false; + } else if (!LHigh && !RHigh) { - // Low register pressure situation, schedule for latency if possible. - bool LStall = left->SchedulingPref == Sched::Latency && - SPQ->getCurCycle() < left->getHeight(); - bool RStall = right->SchedulingPref == Sched::Latency && - SPQ->getCurCycle() < right->getHeight(); - // If scheduling one of the node will cause a pipeline stall, delay it. - // If scheduling either one of the node will cause a pipeline stall, sort - // them according to their height. - // If neither will cause a pipeline stall, try to reduce register pressure. - if (LStall) { - if (!RStall) - return true; - if (left->getHeight() != right->getHeight()) - return left->getHeight() > right->getHeight(); - } else if (RStall) - return false; - - // If either node is scheduling for latency, sort them by height and latency - // first. - if (left->SchedulingPref == Sched::Latency || - right->SchedulingPref == Sched::Latency) { - if (left->getHeight() != right->getHeight()) - return left->getHeight() > right->getHeight(); - if (left->Latency != right->Latency) - return left->Latency > right->Latency; - } + int result = BUCompareLatency(left, right, true /*checkPref*/, SPQ); + if (result != 0) + return result > 0; } - return BURRSort(left, right, SPQ); } -bool ilp_ls_rr_sort::operator()(const SUnit *left, - const SUnit *right) const { +// Schedule as many instructions in each cycle as possible. So don't make an +// instruction available unless it is ready in the current cycle. +bool ilp_ls_rr_sort::isReady(SUnit *SU, unsigned CurCycle) const { + if (SU->getHeight() > CurCycle) return false; + + if (SPQ->getHazardRec()->getHazardType(SU, 0) + != ScheduleHazardRecognizer::NoHazard) + return false; + + return SU->getHeight() <= CurCycle; +} + +bool ilp_ls_rr_sort::operator()(SUnit *left, SUnit *right) const { + if (left->isCall || right->isCall) + // No way to compute latency of calls. + return BURRSort(left, right, SPQ); + bool LHigh = SPQ->HighRegPressure(left); bool RHigh = SPQ->HighRegPressure(right); // Avoid causing spills. If register pressure is high, schedule for @@ -1611,9 +2140,11 @@ bool ilp_ls_rr_sort::operator()(const SUnit *left, return BURRSort(left, right, SPQ); } -template<class SF> -bool -RegReductionPriorityQueue<SF>::canClobber(const SUnit *SU, const SUnit *Op) { +//===----------------------------------------------------------------------===// +// Preschedule for Register Pressure +//===----------------------------------------------------------------------===// + +bool RegReductionPQBase::canClobber(const SUnit *SU, const SUnit *Op) { if (SU->isTwoAddress) { unsigned Opc = SU->getNode()->getMachineOpcode(); const TargetInstrDesc &TID = TII->get(Opc); @@ -1631,19 +2162,6 @@ RegReductionPriorityQueue<SF>::canClobber(const SUnit *SU, const SUnit *Op) { return false; } -/// hasCopyToRegUse - Return true if SU has a value successor that is a -/// CopyToReg node. -static bool hasCopyToRegUse(const SUnit *SU) { - for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end(); - I != E; ++I) { - if (I->isCtrl()) continue; - const SUnit *SuccSU = I->getSUnit(); - if (SuccSU->getNode() && SuccSU->getNode()->getOpcode() == ISD::CopyToReg) - return true; - } - return false; -} - /// canClobberPhysRegDefs - True if SU would clobber one of SuccSU's /// physical register defs. static bool canClobberPhysRegDefs(const SUnit *SuccSU, const SUnit *SU, @@ -1654,7 +2172,7 @@ static bool canClobberPhysRegDefs(const SUnit *SuccSU, const SUnit *SU, const unsigned *ImpDefs = TII->get(N->getMachineOpcode()).getImplicitDefs(); assert(ImpDefs && "Caller should check hasPhysRegDefs"); for (const SDNode *SUNode = SU->getNode(); SUNode; - SUNode = SUNode->getFlaggedNode()) { + SUNode = SUNode->getGluedNode()) { if (!SUNode->isMachineOpcode()) continue; const unsigned *SUImpDefs = @@ -1663,7 +2181,7 @@ static bool canClobberPhysRegDefs(const SUnit *SuccSU, const SUnit *SU, return false; for (unsigned i = NumDefs, e = N->getNumValues(); i != e; ++i) { EVT VT = N->getValueType(i); - if (VT == MVT::Flag || VT == MVT::Other) + if (VT == MVT::Glue || VT == MVT::Other) continue; if (!N->hasAnyUseOfValue(i)) continue; @@ -1709,8 +2227,7 @@ static bool canClobberPhysRegDefs(const SUnit *SuccSU, const SUnit *SU, /// after N, which shortens the U->N live range, reducing /// register pressure. /// -template<class SF> -void RegReductionPriorityQueue<SF>::PrescheduleNodesWithMultipleUses() { +void RegReductionPQBase::PrescheduleNodesWithMultipleUses() { // Visit all the nodes in topological order, working top-down. for (unsigned i = 0, e = SUnits->size(); i != e; ++i) { SUnit *SU = &(*SUnits)[i]; @@ -1748,7 +2265,7 @@ void RegReductionPriorityQueue<SF>::PrescheduleNodesWithMultipleUses() { if (PredSU->NumSuccs == 1) continue; // Avoid prescheduling to copies from virtual registers, which don't behave - // like other nodes from the perspective of scheduling // heuristics. + // like other nodes from the perspective of scheduling heuristics. if (SDNode *N = SU->getNode()) if (N->getOpcode() == ISD::CopyFromReg && TargetRegisterInfo::isVirtualRegister @@ -1802,17 +2319,17 @@ void RegReductionPriorityQueue<SF>::PrescheduleNodesWithMultipleUses() { /// one that has a CopyToReg use (more likely to be a loop induction update). /// If both are two-address, but one is commutable while the other is not /// commutable, favor the one that's not commutable. -template<class SF> -void RegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() { +void RegReductionPQBase::AddPseudoTwoAddrDeps() { for (unsigned i = 0, e = SUnits->size(); i != e; ++i) { SUnit *SU = &(*SUnits)[i]; if (!SU->isTwoAddress) continue; SDNode *Node = SU->getNode(); - if (!Node || !Node->isMachineOpcode() || SU->getNode()->getFlaggedNode()) + if (!Node || !Node->isMachineOpcode() || SU->getNode()->getGluedNode()) continue; + bool isLiveOut = hasOnlyLiveOutUses(SU); unsigned Opc = Node->getMachineOpcode(); const TargetInstrDesc &TID = TII->get(Opc); unsigned NumRes = TID.getNumDefs(); @@ -1862,7 +2379,7 @@ void RegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() { SuccOpc == TargetOpcode::SUBREG_TO_REG) continue; if ((!canClobber(SuccSU, DUSU) || - (hasCopyToRegUse(SU) && !hasCopyToRegUse(SuccSU)) || + (isLiveOut && !hasOnlyLiveOutUses(SuccSU)) || (!SU->isCommutable && SuccSU->isCommutable)) && !scheduleDAG->IsReachable(SuccSU, SU)) { DEBUG(dbgs() << " Adding a pseudo-two-addr edge from SU #" @@ -1877,20 +2394,10 @@ void RegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() { } } -/// CalculateSethiUllmanNumbers - Calculate Sethi-Ullman numbers of all -/// scheduling units. -template<class SF> -void RegReductionPriorityQueue<SF>::CalculateSethiUllmanNumbers() { - SethiUllmanNumbers.assign(SUnits->size(), 0); - - for (unsigned i = 0, e = SUnits->size(); i != e; ++i) - CalcNodeSethiUllmanNumber(&(*SUnits)[i], SethiUllmanNumbers); -} - /// LimitedSumOfUnscheduledPredsOfSuccs - Compute the sum of the unscheduled /// predecessors of the successors of the SUnit SU. Stop when the provided /// limit is exceeded. -static unsigned LimitedSumOfUnscheduledPredsOfSuccs(const SUnit *SU, +static unsigned LimitedSumOfUnscheduledPredsOfSuccs(const SUnit *SU, unsigned Limit) { unsigned Sum = 0; for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end(); @@ -1942,7 +2449,7 @@ bool td_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const { if (left->NumSuccsLeft != right->NumSuccsLeft) return left->NumSuccsLeft > right->NumSuccsLeft; - assert(left->NodeQueueId && right->NodeQueueId && + assert(left->NodeQueueId && right->NodeQueueId && "NodeQueueId cannot be zero"); return (left->NodeQueueId > right->NodeQueueId); } @@ -1952,68 +2459,74 @@ bool td_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const { //===----------------------------------------------------------------------===// llvm::ScheduleDAGSDNodes * -llvm::createBURRListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) { +llvm::createBURRListDAGScheduler(SelectionDAGISel *IS, + CodeGenOpt::Level OptLevel) { const TargetMachine &TM = IS->TM; const TargetInstrInfo *TII = TM.getInstrInfo(); const TargetRegisterInfo *TRI = TM.getRegisterInfo(); - + BURegReductionPriorityQueue *PQ = new BURegReductionPriorityQueue(*IS->MF, false, TII, TRI, 0); - ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, true, false, PQ); + ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, false, PQ, OptLevel); PQ->setScheduleDAG(SD); - return SD; + return SD; } llvm::ScheduleDAGSDNodes * -llvm::createTDRRListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) { +llvm::createTDRRListDAGScheduler(SelectionDAGISel *IS, + CodeGenOpt::Level OptLevel) { const TargetMachine &TM = IS->TM; const TargetInstrInfo *TII = TM.getInstrInfo(); const TargetRegisterInfo *TRI = TM.getRegisterInfo(); - + TDRegReductionPriorityQueue *PQ = new TDRegReductionPriorityQueue(*IS->MF, false, TII, TRI, 0); - ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, false, false, PQ); + ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, false, PQ, OptLevel); PQ->setScheduleDAG(SD); return SD; } llvm::ScheduleDAGSDNodes * -llvm::createSourceListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) { +llvm::createSourceListDAGScheduler(SelectionDAGISel *IS, + CodeGenOpt::Level OptLevel) { const TargetMachine &TM = IS->TM; const TargetInstrInfo *TII = TM.getInstrInfo(); const TargetRegisterInfo *TRI = TM.getRegisterInfo(); - + SrcRegReductionPriorityQueue *PQ = new SrcRegReductionPriorityQueue(*IS->MF, false, TII, TRI, 0); - ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, true, false, PQ); + ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, false, PQ, OptLevel); PQ->setScheduleDAG(SD); - return SD; + return SD; } llvm::ScheduleDAGSDNodes * -llvm::createHybridListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) { +llvm::createHybridListDAGScheduler(SelectionDAGISel *IS, + CodeGenOpt::Level OptLevel) { const TargetMachine &TM = IS->TM; const TargetInstrInfo *TII = TM.getInstrInfo(); const TargetRegisterInfo *TRI = TM.getRegisterInfo(); const TargetLowering *TLI = &IS->getTargetLowering(); - + HybridBURRPriorityQueue *PQ = new HybridBURRPriorityQueue(*IS->MF, true, TII, TRI, TLI); - ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, true, true, PQ); + + ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, true, PQ, OptLevel); PQ->setScheduleDAG(SD); - return SD; + return SD; } llvm::ScheduleDAGSDNodes * -llvm::createILPListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) { +llvm::createILPListDAGScheduler(SelectionDAGISel *IS, + CodeGenOpt::Level OptLevel) { const TargetMachine &TM = IS->TM; const TargetInstrInfo *TII = TM.getInstrInfo(); const TargetRegisterInfo *TRI = TM.getRegisterInfo(); const TargetLowering *TLI = &IS->getTargetLowering(); - + ILPBURRPriorityQueue *PQ = new ILPBURRPriorityQueue(*IS->MF, true, TII, TRI, TLI); - ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, true, true, PQ); + ScheduleDAGRRList *SD = new ScheduleDAGRRList(*IS->MF, true, PQ, OptLevel); PQ->setScheduleDAG(SD); - return SD; + return SD; } |
