llvm::PreRARematStage Class Reference

Attempts to reduce function spilling or, if there is no spilling, to increase function occupancy by one with respect to ArchVGPR usage by sinking trivially rematerializable instructions to their use. More...

#include "Target/AMDGPU/GCNSchedStrategy.h"

Inheritance diagram for llvm::PreRARematStage:

Public Member Functions
bool	initGCNSchedStage () override
bool	initGCNRegion () override
bool	shouldRevertScheduling (unsigned WavesAfter) override
	PreRARematStage (GCNSchedStageID StageID, GCNScheduleDAGMILive &DAG)
Public Member Functions inherited from llvm::GCNSchedStage
void	setupNewBlock ()
void	finalizeGCNRegion ()
void	checkScheduling ()
ScheduleMetrics	getScheduleMetrics (const std::vector< SUnit > &InputSchedule)
ScheduleMetrics	getScheduleMetrics (const GCNScheduleDAGMILive &DAG)
unsigned	computeSUnitReadyCycle (const SUnit &SU, unsigned CurrCycle, DenseMap< unsigned, unsigned > &ReadyCycles, const TargetSchedModel &SM)
bool	isRegionWithExcessRP () const
unsigned	getRegionIdx ()
bool	mayCauseSpilling (unsigned WavesAfter)
void	revertScheduling ()
void	advanceRegion ()
virtual	~GCNSchedStage ()=default

Additional Inherited Members
Protected Member Functions inherited from llvm::GCNSchedStage
	GCNSchedStage (GCNSchedStageID StageID, GCNScheduleDAGMILive &DAG)
Protected Attributes inherited from llvm::GCNSchedStage
GCNScheduleDAGMILive &	DAG
GCNSchedStrategy &	S
MachineFunction &	MF
SIMachineFunctionInfo &	MFI
const GCNSubtarget &	ST
const GCNSchedStageID	StageID
MachineBasicBlock *	CurrentMBB = nullptr
unsigned	RegionIdx = 0
std::vector< MachineInstr * >	Unsched
GCNRegPressure	PressureBefore
GCNRegPressure	PressureAfter
std::vector< std::unique_ptr< ScheduleDAGMutation > >	SavedMutations

Detailed Description

Attempts to reduce function spilling or, if there is no spilling, to increase function occupancy by one with respect to ArchVGPR usage by sinking trivially rematerializable instructions to their use.

When the stage estimates reducing spilling or increasing occupancy is possible, as few instructions as possible are rematerialized to reduce potential negative effects on function latency.

Definition at line 440 of file GCNSchedStrategy.h.

Constructor & Destructor Documentation

PreRARematStage()

llvm::PreRARematStage::PreRARematStage ( GCNSchedStageID StageID, GCNScheduleDAGMILive & DAG )

inline

Definition at line 513 of file GCNSchedStrategy.h.

References llvm::GCNSchedStage::DAG, llvm::GCNSchedStage::GCNSchedStage(), llvm::size(), and llvm::GCNSchedStage::StageID.

Member Function Documentation

initGCNRegion()

bool PreRARematStage::initGCNRegion ( )

overridevirtual

Reimplemented from llvm::GCNSchedStage.

Definition at line 1242 of file GCNSchedStrategy.cpp.

References llvm::GCNSchedStage::initGCNRegion(), and llvm::GCNSchedStage::RegionIdx.

initGCNSchedStage()

bool PreRARematStage::initGCNSchedStage ( )

overridevirtual

Reimplemented from llvm::GCNSchedStage.

Definition at line 1092 of file GCNSchedStrategy.cpp.

References assert(), llvm::GCNSchedStage::DAG, llvm::dbgs(), GCNTrackers, llvm::RegionBase< Tr >::getParent(), I, llvm::GCNSchedStage::initGCNSchedStage(), llvm::GCNSchedStage::MF, llvm::GCNSchedStage::MFI, MI, REMAT_DEBUG, and llvm::GCNSchedStage::S.

shouldRevertScheduling()

bool PreRARematStage::shouldRevertScheduling ( unsigned WavesAfter )

overridevirtual

Reimplemented from llvm::GCNSchedStage.

Definition at line 1547 of file GCNSchedStrategy.cpp.

References llvm::GCNSchedStage::mayCauseSpilling(), and llvm::GCNSchedStage::shouldRevertScheduling().

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

• lib/Target/AMDGPU/GCNSchedStrategy.h
• lib/Target/AMDGPU/GCNSchedStrategy.cpp