LLVM  16.0.0git
Public Member Functions | List of all members
llvm::GCNMaxOccupancySchedStrategy Class Referencefinal

The goal of this scheduling strategy is to maximize kernel occupancy (i.e. More...

#include "Target/AMDGPU/GCNSchedStrategy.h"

Inheritance diagram for llvm::GCNMaxOccupancySchedStrategy:
Inheritance graph
[legend]
Collaboration diagram for llvm::GCNMaxOccupancySchedStrategy:
Collaboration graph
[legend]

Public Member Functions

 GCNMaxOccupancySchedStrategy (const MachineSchedContext *C)
 
- Public Member Functions inherited from llvm::GCNSchedStrategy
 GCNSchedStrategy (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...
 
unsigned getTargetOccupancy ()
 
void setTargetOccupancy (unsigned Occ)
 
GCNSchedStageID getCurrentStage ()
 
bool advanceStage ()
 
bool hasNextStage () const
 
GCNSchedStageID getNextStage () const
 
- 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...
 

Additional Inherited Members

- Public Types inherited from llvm::GenericSchedulerBase
enum  CandReason : uint8_t {
  NoCand, Only1, PhysReg, RegExcess,
  RegCritical, Stall, Cluster, Weak,
  RegMax, ResourceReduce, ResourceDemand, BotHeightReduce,
  BotPathReduce, TopDepthReduce, TopPathReduce, NextDefUse,
  NodeOrder
}
 Represent the type of SchedCandidate found within a single queue. More...
 
- Static Public Member Functions inherited from llvm::GenericSchedulerBase
static const char * getReasonStr (GenericSchedulerBase::CandReason Reason)
 
- Public Attributes inherited from llvm::GCNSchedStrategy
bool HasHighPressure
 
const unsigned DefaultErrorMargin = 3
 
const unsigned HighRPErrorMargin = 10
 
unsigned ErrorMargin = DefaultErrorMargin
 
unsigned SGPRCriticalLimit
 
unsigned VGPRCriticalLimit
 
- Protected Member Functions inherited from llvm::GCNSchedStrategy
SUnitpickNodeBidirectional (bool &IsTopNode)
 
void pickNodeFromQueue (SchedBoundary &Zone, const CandPolicy &ZonePolicy, const RegPressureTracker &RPTracker, SchedCandidate &Cand)
 
void initCandidate (SchedCandidate &Cand, SUnit *SU, bool AtTop, const RegPressureTracker &RPTracker, const SIRegisterInfo *SRI, unsigned SGPRPressure, unsigned VGPRPressure)
 
- 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)
 
virtual bool tryCandidate (SchedCandidate &Cand, SchedCandidate &TryCand, SchedBoundary *Zone) const
 Apply a set of heuristics 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 reschedulePhysReg (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::GCNSchedStrategy
std::vector< unsigned > Pressure
 
std::vector< unsigned > MaxPressure
 
unsigned SGPRExcessLimit
 
unsigned VGPRExcessLimit
 
unsigned TargetOccupancy
 
MachineFunctionMF
 
SmallVector< GCNSchedStageID, 4 > SchedStages
 
SmallVectorImpl< GCNSchedStageID >::iterator CurrentStage = nullptr
 
- 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

The goal of this scheduling strategy is to maximize kernel occupancy (i.e.

maximum number of waves per simd).

Definition at line 113 of file GCNSchedStrategy.h.

Constructor & Destructor Documentation

◆ GCNMaxOccupancySchedStrategy()

GCNMaxOccupancySchedStrategy::GCNMaxOccupancySchedStrategy ( const MachineSchedContext C)

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