LLVM  6.0.0svn
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llvm::GCNMaxOccupancySchedStrategy Class Reference

This is a minimal scheduler strategy. More...

#include "Target/AMDGPU/GCNSchedStrategy.h"

Inheritance diagram for llvm::GCNMaxOccupancySchedStrategy:
Inheritance graph
Collaboration diagram for llvm::GCNMaxOccupancySchedStrategy:
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Public Member Functions

 GCNMaxOccupancySchedStrategy (const MachineSchedContext *C)
SUnitpickNode (bool &IsTopNode) override
 Pick the best node to balance the schedule. Implements MachineSchedStrategy. More...
void initialize (ScheduleDAGMI *DAG) override
 Initialize the strategy after building the DAG for a new region. More...
void setTargetOccupancy (unsigned Occ)
- Public Member Functions inherited from llvm::GenericScheduler
 GenericScheduler (const MachineSchedContext *C)
void initPolicy (MachineBasicBlock::iterator Begin, MachineBasicBlock::iterator End, unsigned NumRegionInstrs) override
 Initialize the per-region scheduling policy. More...
void dumpPolicy () const override
bool shouldTrackPressure () const override
 Check if pressure tracking is needed before building the DAG and initializing this strategy. More...
bool shouldTrackLaneMasks () const override
 Returns true if lanemasks should be tracked. More...
void schedNode (SUnit *SU, bool IsTopNode) override
 Update the scheduler's state after scheduling a node. More...
void releaseTopNode (SUnit *SU) override
 When all predecessor dependencies have been resolved, free this node for top-down scheduling. More...
void releaseBottomNode (SUnit *SU) override
 When all successor dependencies have been resolved, free this node for bottom-up scheduling. More...
void registerRoots () override
 Notify this strategy that all roots have been released (including those that depend on EntrySU or ExitSU). More...
- Public Member Functions inherited from llvm::MachineSchedStrategy
virtual ~MachineSchedStrategy ()=default
virtual bool doMBBSchedRegionsTopDown () const
virtual void enterMBB (MachineBasicBlock *MBB)
 Tell the strategy that MBB is about to be processed. More...
virtual void leaveMBB ()
 Tell the strategy that current MBB is done. More...
virtual void scheduleTree (unsigned SubtreeID)
 Scheduler callback to notify that a new subtree is scheduled. More...


class GCNScheduleDAGMILive

Additional Inherited Members

- Public Types inherited from llvm::GenericSchedulerBase
enum  CandReason : uint8_t {
  NoCand, Only1, PhysRegCopy, RegExcess,
  RegCritical, Stall, Cluster, Weak,
  RegMax, ResourceReduce, ResourceDemand, BotHeightReduce,
  BotPathReduce, TopDepthReduce, TopPathReduce, NextDefUse,
 Represent the type of SchedCandidate found within a single queue. More...
- Static Public Member Functions inherited from llvm::GenericSchedulerBase
static const chargetReasonStr (GenericSchedulerBase::CandReason Reason)
- Protected Member Functions inherited from llvm::GenericScheduler
void checkAcyclicLatency ()
 Set IsAcyclicLatencyLimited if the acyclic path is longer than the cyclic critical path by more cycles than it takes to drain the instruction buffer. More...
void initCandidate (SchedCandidate &Cand, SUnit *SU, bool AtTop, const RegPressureTracker &RPTracker, RegPressureTracker &TempTracker)
void tryCandidate (SchedCandidate &Cand, SchedCandidate &TryCand, SchedBoundary *Zone)
 Apply a set of heursitics to a new candidate. More...
SUnitpickNodeBidirectional (bool &IsTopNode)
 Pick the best candidate node from either the top or bottom queue. More...
void pickNodeFromQueue (SchedBoundary &Zone, const CandPolicy &ZonePolicy, const RegPressureTracker &RPTracker, SchedCandidate &Candidate)
 Pick the best candidate from the queue. More...
void reschedulePhysRegCopies (SUnit *SU, bool isTop)
- Protected Member Functions inherited from llvm::GenericSchedulerBase
 GenericSchedulerBase (const MachineSchedContext *C)
void setPolicy (CandPolicy &Policy, bool IsPostRA, SchedBoundary &CurrZone, SchedBoundary *OtherZone)
 Set the CandPolicy given a scheduling zone given the current resources and latencies inside and outside the zone. More...
void traceCandidate (const SchedCandidate &Cand)
- Protected Attributes inherited from llvm::GenericScheduler
ScheduleDAGMILiveDAG = nullptr
MachineSchedPolicy RegionPolicy
SchedBoundary Top
SchedBoundary Bot
SchedCandidate TopCand
 Candidate last picked from Top boundary. More...
SchedCandidate BotCand
 Candidate last picked from Bot boundary. More...
- Protected Attributes inherited from llvm::GenericSchedulerBase
const MachineSchedContextContext
const TargetSchedModelSchedModel = nullptr
const TargetRegisterInfoTRI = nullptr
SchedRemainder Rem

Detailed Description

This is a minimal scheduler strategy.

The main difference between this and the GenericScheduler is that GCNSchedStrategy uses different heuristics to determine excess/critical pressure sets. Its goal is to maximize kernel occupancy (i.e. maximum number of waves per simd).

Definition at line 30 of file GCNSchedStrategy.h.

Constructor & Destructor Documentation

◆ GCNMaxOccupancySchedStrategy()

GCNMaxOccupancySchedStrategy::GCNMaxOccupancySchedStrategy ( const MachineSchedContext C)

Definition at line 27 of file GCNSchedStrategy.cpp.

Member Function Documentation

◆ initialize()

void GCNMaxOccupancySchedStrategy::initialize ( ScheduleDAGMI DAG)

Initialize the strategy after building the DAG for a new region.

Reimplemented from llvm::GenericScheduler.

Definition at line 43 of file GCNSchedStrategy.cpp.

References assert(), llvm::GenericSchedulerBase::SchedCandidate::AtTop, llvm::SchedBoundary::Available, llvm::GenericScheduler::Bot, llvm::GenericScheduler::BotCand, llvm::GenericSchedulerBase::Context, llvm::RegPressureDelta::CriticalMax, llvm::SchedBoundary::DAG, llvm::GenericScheduler::DAG, llvm::dbgs(), DEBUG, llvm::RegPressureDelta::Excess, llvm::ScheduleDAGMILive::getBotRPTracker(), llvm::RegPressureTracker::getDownwardPressure(), llvm::SUnit::getInstr(), llvm::SISubtarget::getMaxNumSGPRs(), llvm::SISubtarget::getMaxNumVGPRs(), llvm::RegisterClassInfo::getNumAllocatableRegs(), llvm::SIRegisterInfo::getRegPressureSetLimit(), llvm::RegPressureTracker::getRegSetPressureAtPos(), llvm::SIRegisterInfo::getSGPRPressureSet(), llvm::MachineFunction::getSubtarget(), llvm::ScheduleDAGMILive::getTopRPTracker(), llvm::PressureChange::getUnitInc(), llvm::RegPressureTracker::getUpwardPressure(), llvm::SIRegisterInfo::getVGPRPressureSet(), llvm::GenericScheduler::initialize(), llvm::GenericSchedulerBase::SchedCandidate::initResourceDelta(), llvm::SUnit::isScheduled, llvm::SchedBoundary::isTop(), llvm::GenericSchedulerBase::SchedCandidate::isValid(), llvm::ScheduleDAG::MF, llvm::GenericSchedulerBase::NoCand, llvm::SchedBoundary::pickOnlyChoice(), llvm::GenericSchedulerBase::SchedCandidate::Policy, llvm::GenericSchedulerBase::SchedCandidate::Reason, llvm::MachineSchedContext::RegClassInfo, llvm::GenericSchedulerBase::RegCritical, llvm::GenericSchedulerBase::RegExcess, llvm::GenericSchedulerBase::SchedCandidate::ResDelta, llvm::GenericSchedulerBase::SchedCandidate::reset(), llvm::GenericSchedulerBase::SchedCandidate::RPDelta, llvm::GenericSchedulerBase::SchedModel, llvm::GenericSchedulerBase::SchedCandidate::setBest(), llvm::GenericSchedulerBase::setPolicy(), llvm::PressureChange::setUnitInc(), llvm::ARM_MB::ST, llvm::GenericSchedulerBase::SchedCandidate::SU, llvm::GenericScheduler::Top, llvm::GenericScheduler::TopCand, llvm::GenericSchedulerBase::traceCandidate(), llvm::GenericSchedulerBase::TRI, and llvm::GenericScheduler::tryCandidate().

◆ pickNode()

SUnit * GCNMaxOccupancySchedStrategy::pickNode ( bool IsTopNode)

◆ setTargetOccupancy()

void llvm::GCNMaxOccupancySchedStrategy::setTargetOccupancy ( unsigned  Occ)

Friends And Related Function Documentation

◆ GCNScheduleDAGMILive

friend class GCNScheduleDAGMILive

Definition at line 31 of file GCNSchedStrategy.h.

The documentation for this class was generated from the following files: