LLVM: llvm::GCNRegPressure Struct Reference (original) (raw)

#include "[Target/AMDGPU/GCNRegPressure.h](GCNRegPressure%5F8h%5Fsource.html)"

Public Types
enum	RegKind { SGPR, VGPR, AGPR, AVGPR, TOTAL_KINDS }

Public Member Functions
	GCNRegPressure ()
bool	empty () const
void	clear ()
unsigned	getNumRegs (RegKind Kind) const
unsigned	getSGPRNum () const
unsigned	getVGPRNum (bool UnifiedVGPRFile) const
unsigned	getArchVGPRNum () const
unsigned	getAGPRNum () const
unsigned	getAVGPRNum () const
unsigned	getVGPRTuplesWeight () const
unsigned	getSGPRTuplesWeight () const
unsigned	getOccupancy (const GCNSubtarget &ST, unsigned DynamicVGPRBlockSize) const
void	inc (unsigned Reg, LaneBitmask PrevMask, LaneBitmask NewMask, const MachineRegisterInfo &MRI)
bool	higherOccupancy (const GCNSubtarget &ST, const GCNRegPressure &O, unsigned DynamicVGPRBlockSize) 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

Definition at line 32 of file GCNRegPressure.h.

◆ RegKind

Enumerator
SGPR
VGPR
AGPR
AVGPR
TOTAL_KINDS

Definition at line 33 of file GCNRegPressure.h.

llvm::GCNRegPressure::GCNRegPressure ( )	inline

◆ clear()

void llvm::GCNRegPressure::clear ( )	inline

◆ dump()

void GCNRegPressure::dump	(	)	const

◆ empty()

bool llvm::GCNRegPressure::empty ( ) const	inline

◆ getAGPRNum()

unsigned llvm::GCNRegPressure::getAGPRNum ( ) const	inline

◆ getArchVGPRNum()

unsigned llvm::GCNRegPressure::getArchVGPRNum ( ) const	inline

◆ getAVGPRNum()

unsigned llvm::GCNRegPressure::getAVGPRNum ( ) const	inline

◆ getName()

constexpr const char * llvm::GCNRegPressure::getName ( RegKind Kind)	inlinestaticconstexpr

◆ getNumRegs()

unsigned llvm::GCNRegPressure::getNumRegs ( RegKind Kind) const	inline

◆ getOccupancy()

◆ getRegKind()

◆ getSGPRNum()

unsigned llvm::GCNRegPressure::getSGPRNum ( ) const	inline

◆ getSGPRTuplesWeight()

unsigned llvm::GCNRegPressure::getSGPRTuplesWeight ( ) const	inline

◆ getUnifiedVGPRNum()

◆ getVGPRNum()

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

◆ getVGPRTuplesWeight()

unsigned llvm::GCNRegPressure::getVGPRTuplesWeight ( ) const	inline

◆ higherOccupancy()

◆ inc()

Definition at line 49 of file GCNRegPressure.cpp.

References assert(), llvm::SIRegisterInfo::getNumCoveredRegs(), getRegKind(), MRI, llvm::LaneBitmask::none(), std::swap(), TOTAL_KINDS, and TRI.

Referenced by llvm::GCNDownwardRPTracker::bumpDownwardPressure(), llvm::dumpMaxRegPressure(), llvm::getRegPressure(), and llvm::GCNUpwardRPTracker::recede().

◆ less()

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):

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

Definition at line 100 of file GCNRegPressure.cpp.

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