This is a minimal scheduler strategy. More...

#include "Target/AMDGPU/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)

SUnit *	pickNode (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...

Friends
class	GCNScheduleDAGMILive

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)

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 void	tryCandidate (SchedCandidate &Cand, SchedCandidate &TryCand, SchedBoundary *Zone) const
	Apply a set of heuristics to a new candidate. More...

SUnit *	pickNodeBidirectional (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::GenericScheduler
ScheduleDAGMILive *	DAG = 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 MachineSchedContext *	Context

const TargetSchedModel *	SchedModel = nullptr

const TargetRegisterInfo *	TRI = 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 29 of file GCNSchedStrategy.h.