LLVM  4.0.0
Public Member Functions | List of all members
llvm::GCNMaxOccupancySchedStrategy Class Reference

This is a minimal scheduler strategy. More...

#include <GCNSchedStrategy.h>

Inheritance diagram for llvm::GCNMaxOccupancySchedStrategy:
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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...
 
- 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 () 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 initialize (ScheduleDAGMI *dag) override
 Initialize the strategy after building the DAG for a new region. 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 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, PhysRegCopy, 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)
 
- 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
 
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
 
const TargetRegisterInfoTRI
 
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 27 of file GCNSchedStrategy.h.

Constructor & Destructor Documentation

GCNMaxOccupancySchedStrategy::GCNMaxOccupancySchedStrategy ( const MachineSchedContext C)

Definition at line 26 of file GCNSchedStrategy.cpp.

Member Function Documentation

SUnit * GCNMaxOccupancySchedStrategy::pickNode ( bool IsTopNode)
overridevirtual

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