llvm::GCNRegPressure Struct Reference

#include "Target/AMDGPU/GCNRegPressure.h"

Public Types
enum	RegKind {   SGPR32 , SGPR_TUPLE , VGPR32 , VGPR_TUPLE ,   AGPR32 , AGPR_TUPLE , TOTAL_KINDS }

Public Member Functions
	GCNRegPressure ()
bool	empty () const
void	clear ()
unsigned	getSGPRNum () const
unsigned	getVGPRNum (bool UnifiedVGPRFile) const
unsigned	getArchVGPRNum () const
unsigned	getAGPRNum () const
unsigned	getVGPRTuplesWeight () const
unsigned	getSGPRTuplesWeight () const
unsigned	getOccupancy (const GCNSubtarget &ST) const
void	inc (unsigned Reg, LaneBitmask PrevMask, LaneBitmask NewMask, const MachineRegisterInfo &MRI)
bool	higherOccupancy (const GCNSubtarget &ST, const GCNRegPressure &O) const
bool	less (const MachineFunction &MF, const GCNRegPressure &O, unsigned MaxOccupancy=std::numeric_limits< unsigned >::max()) const
	Compares this GCNRegpressure to O, returning true if this is less.
bool	operator== (const GCNRegPressure &O) const
bool	operator!= (const GCNRegPressure &O) const
GCNRegPressure &	operator+= (const GCNRegPressure &RHS)
GCNRegPressure &	operator-= (const GCNRegPressure &RHS)
void	dump () const

Friends
GCNRegPressure	max (const GCNRegPressure &P1, const GCNRegPressure &P2)
Printable	print (const GCNRegPressure &RP, const GCNSubtarget *ST)

Detailed Description

Definition at line 30 of file GCNRegPressure.h.

Member Enumeration Documentation

RegKind

enum llvm::GCNRegPressure::RegKind

Enumerator
SGPR32
SGPR_TUPLE
VGPR32
VGPR_TUPLE
AGPR32
AGPR_TUPLE
TOTAL_KINDS

Definition at line 31 of file GCNRegPressure.h.

Constructor & Destructor Documentation

GCNRegPressure()

llvm::GCNRegPressure::GCNRegPressure ( )

inline

Definition at line 41 of file GCNRegPressure.h.

References clear().

Member Function Documentation

clear()

void llvm::GCNRegPressure::clear ( )

inline

Definition at line 47 of file GCNRegPressure.h.

References TOTAL_KINDS.

Referenced by llvm::GCNRPTracker::clearMaxPressure(), GCNRegPressure(), llvm::GCNDownwardRPTracker::moveMaxPressure(), and llvm::GCNIterativeScheduler::OverrideLegacyStrategy::schedule().

dump()

void GCNRegPressure::dump

(

)

const

Definition at line 588 of file GCNRegPressure.cpp.

References llvm::dbgs(), and print.

empty()

bool llvm::GCNRegPressure::empty ( ) const

inline

Definition at line 45 of file GCNRegPressure.h.

References getSGPRNum(), and getVGPRNum().

Referenced by llvm::GCNIterativeScheduler::scheduleRegion().

getAGPRNum()

unsigned llvm::GCNRegPressure::getAGPRNum ( ) const

inline

Returns

the AccVGPR32 pressure

Definition at line 63 of file GCNRegPressure.h.

References AGPR32.

Referenced by llvm::GCNSchedStage::checkScheduling(), and less().

getArchVGPRNum()

unsigned llvm::GCNRegPressure::getArchVGPRNum ( ) const

inline

Returns

the ArchVGPR32 pressure

Definition at line 61 of file GCNRegPressure.h.

References VGPR32.

getOccupancy()

unsigned llvm::GCNRegPressure::getOccupancy ( const GCNSubtarget &  ST ) const

inline

Definition at line 69 of file GCNRegPressure.h.

References getSGPRNum(), and getVGPRNum().

Referenced by llvm::GCNSchedStage::checkScheduling(), higherOccupancy(), llvm::GCNSchedStage::revertScheduling(), and llvm::UnclusteredHighRPStage::shouldRevertScheduling().

getSGPRNum()

unsigned llvm::GCNRegPressure::getSGPRNum ( ) const

inline

Returns

the SGPR32 pressure

Definition at line 50 of file GCNRegPressure.h.

References SGPR32.

Referenced by llvm::GCNSchedStage::checkScheduling(), empty(), getOccupancy(), and less().

getSGPRTuplesWeight()

unsigned llvm::GCNRegPressure::getSGPRTuplesWeight ( ) const

inline

Definition at line 67 of file GCNRegPressure.h.

References SGPR_TUPLE.

Referenced by less().

getVGPRNum()

unsigned llvm::GCNRegPressure::getVGPRNum ( bool  UnifiedVGPRFile ) const

inline

Returns

the aggregated ArchVGPR32, AccVGPR32 pressure dependent upon UnifiedVGPRFile

Definition at line 53 of file GCNRegPressure.h.

References AGPR32, llvm::alignTo(), and VGPR32.

Referenced by llvm::GCNSchedStage::checkScheduling(), empty(), getOccupancy(), and less().

getVGPRTuplesWeight()

unsigned llvm::GCNRegPressure::getVGPRTuplesWeight ( ) const

inline

Definition at line 65 of file GCNRegPressure.h.

References AGPR_TUPLE, and VGPR_TUPLE.

Referenced by less().

higherOccupancy()

bool llvm::GCNRegPressure::higherOccupancy ( const GCNSubtarget &  ST, const GCNRegPressure &  O  ) const

inline

Definition at line 79 of file GCNRegPressure.h.

References getOccupancy().

inc()

void GCNRegPressure::inc	(	unsigned	Reg,
		LaneBitmask	PrevMask,
		LaneBitmask	NewMask,
		const MachineRegisterInfo &	MRI
	)

Definition at line 50 of file GCNRegPressure.cpp.

References AGPR32, AGPR_TUPLE, assert(), llvm::SIRegisterInfo::getNumCoveredRegs(), llvm_unreachable, MRI, llvm::LaneBitmask::none(), SGPR32, SGPR_TUPLE, std::swap(), TRI, VGPR32, and VGPR_TUPLE.

Referenced by llvm::GCNDownwardRPTracker::advanceBeforeNext(), llvm::GCNDownwardRPTracker::advanceToNext(), llvm::getRegPressure(), and llvm::GCNUpwardRPTracker::recede().

less()

bool GCNRegPressure::less	(	const MachineFunction &	MF,
		const GCNRegPressure &	O,
		unsigned	MaxOccupancy = std::numeric_limits<unsigned>::max()
	)		const

Compares this GCNRegpressure to O, returning true if this is less.

Since GCNRegpressure contains different types of pressures, and due to target-specific pecularities (e.g. we care about occupancy rather than raw register usage), we determine if this GCNRegPressure is less than O based on the following tiered comparisons (in order order of precedence):

1. Better occupancy
2. Less spilling (first preference to VGPR spills, then to SGPR spills)
3. Less tuple register pressure (first preference to VGPR tuples if we determine that SGPR pressure is not important)
4. Less raw register pressure (first preference to VGPR tuples if we determine that SGPR pressure is not important)

Definition at line 91 of file GCNRegPressure.cpp.

References getAGPRNum(), getSGPRNum(), getSGPRTuplesWeight(), llvm::MachineFunction::getSubtarget(), getVGPRNum(), getVGPRTuplesWeight(), and I.

Referenced by llvm::GCNSchedStage::mayCauseSpilling().

operator!=()

bool llvm::GCNRegPressure::operator!= ( const GCNRegPressure &  O ) const

inline

Definition at line 102 of file GCNRegPressure.h.

operator+=()

GCNRegPressure & llvm::GCNRegPressure::operator+= ( const GCNRegPressure &  RHS )

inline

Definition at line 106 of file GCNRegPressure.h.

References I, RHS, and TOTAL_KINDS.

operator-=()

GCNRegPressure & llvm::GCNRegPressure::operator-= ( const GCNRegPressure &  RHS )

inline

Definition at line 112 of file GCNRegPressure.h.

References I, RHS, and TOTAL_KINDS.

operator==()

bool llvm::GCNRegPressure::operator== ( const GCNRegPressure &  O ) const

inline

Definition at line 98 of file GCNRegPressure.h.

References TOTAL_KINDS.

Friends And Related Function Documentation

max

GCNRegPressure max ( const GCNRegPressure &  P1, const GCNRegPressure &  P2  )

friend

Definition at line 131 of file GCNRegPressure.h.

print

Printable print ( const GCNRegPressure &  RP, const GCNSubtarget *  ST  )

friend

Referenced by dump().

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

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