Models a register pressure target, allowing to evaluate and track register savings against that target from a starting GCNRegPressure. More...

#include "Target/AMDGPU/GCNRegPressure.h"

Public Member Functions
	GCNRPTarget (const MachineFunction &MF, const GCNRegPressure &RP)
	Sets up the target such that the register pressure starting at `RP` does not show register spilling on function `MF` (w.r.t.
	GCNRPTarget (unsigned NumSGPRs, unsigned NumVGPRs, const MachineFunction &MF, const GCNRegPressure &RP)
	Sets up the target such that the register pressure starting at `RP` does not use more than `NumSGPRs` SGPRs and `NumVGPRs` VGPRs on function `MF`.
	GCNRPTarget (unsigned Occupancy, const MachineFunction &MF, const GCNRegPressure &RP)
	Sets up the target such that the register pressure starting at `RP` does not prevent achieving an occupancy of at least `Occupancy` on function `MF`.
void	setTarget (unsigned NumSGPRs, unsigned NumVGPRs)
	Changes the target (same semantics as constructor).
const GCNRegPressure &	getCurrentRP () const
void	setRP (const GCNRegPressure &NewRP)
bool	isSaveBeneficial (Register Reg) const
	Determines whether saving virtual register `Reg` will be beneficial towards achieving the RP target.
void	saveReg (Register Reg, LaneBitmask Mask, const MachineRegisterInfo &MRI)
	Saves virtual register `Reg` with lanemask `Mask`.
unsigned	getNumRegsBenefit (const GCNRegPressure &SaveRP) const
	Returns the benefit towards achieving the RP target that saving `SaveRP` represents, in total number of registers saved across all classes.
void	saveRP (const GCNRegPressure &SaveRP)
	Saves a total pressure of `SaveRP`.
bool	satisfied (const GCNRegPressure &TestRP) const
	Whether `TestRP` is at or below the defined pressure target.
bool	satisfied () const
	Whether the current RP is at or below the defined pressure target.
bool	hasVectorRegisterExcess () const
unsigned	getMaxSGPRs () const
unsigned	getMaxVGPRs () const

Friends
raw_ostream &	operator<< (raw_ostream &OS, const GCNRPTarget &Target)

Detailed Description

Models a register pressure target, allowing to evaluate and track register savings against that target from a starting GCNRegPressure.

Definition at line 223 of file GCNRegPressure.h.

Constructor & Destructor Documentation

◆ GCNRPTarget() [1/3]

GCNRPTarget::GCNRPTarget	(	const MachineFunction &	MF,
		const GCNRegPressure &	RP )

Sets up the target such that the register pressure starting at RP does not show register spilling on function MF (w.r.t.

the function's mininum target occupancy).

Definition at line 373 of file GCNRegPressure.cpp.

References F, GCNRPTarget(), and setTarget().

Referenced by GCNRPTarget(), GCNRPTarget(), GCNRPTarget(), and operator<<.

◆ GCNRPTarget() [2/3]

GCNRPTarget::GCNRPTarget	(	unsigned	NumSGPRs,
		unsigned	NumVGPRs,
		const MachineFunction &	MF,
		const GCNRegPressure &	RP )

Sets up the target such that the register pressure starting at RP does not use more than NumSGPRs SGPRs and NumVGPRs VGPRs on function MF.

Definition at line 380 of file GCNRegPressure.cpp.

References GCNRPTarget(), and setTarget().

◆ GCNRPTarget() [3/3]

GCNRPTarget::GCNRPTarget	(	unsigned	Occupancy,
		const MachineFunction &	MF,
		const GCNRegPressure &	RP )

Sets up the target such that the register pressure starting at RP does not prevent achieving an occupancy of at least Occupancy on function MF.

Definition at line 386 of file GCNRegPressure.cpp.

References GCNRPTarget(), llvm::SIMachineFunctionInfo::getDynamicVGPRBlockSize(), and setTarget().

Member Function Documentation

◆ getCurrentRP()

const GCNRegPressure & llvm::GCNRPTarget::getCurrentRP ( ) const

inline

Definition at line 245 of file GCNRegPressure.h.

◆ getMaxSGPRs()

unsigned llvm::GCNRPTarget::getMaxSGPRs ( ) const

inline

Definition at line 274 of file GCNRegPressure.h.

◆ getMaxVGPRs()

unsigned llvm::GCNRPTarget::getMaxVGPRs ( ) const

inline

Definition at line 275 of file GCNRegPressure.h.

◆ getNumRegsBenefit()

unsigned GCNRPTarget::getNumRegsBenefit ( const GCNRegPressure & SaveRP ) const

Returns the benefit towards achieving the RP target that saving SaveRP represents, in total number of registers saved across all classes.

Definition at line 427 of file GCNRegPressure.cpp.

References llvm::GCNRegPressure::getAGPRNum(), llvm::GCNRegPressure::getArchVGPRNum(), and llvm::GCNRegPressure::getSGPRNum().

◆ hasVectorRegisterExcess()

bool GCNRPTarget::hasVectorRegisterExcess ( ) const

Definition at line 459 of file GCNRegPressure.cpp.

◆ isSaveBeneficial()

bool GCNRPTarget::isSaveBeneficial ( Register Reg ) const

Determines whether saving virtual register Reg will be beneficial towards achieving the RP target.

Definition at line 410 of file GCNRegPressure.cpp.

References llvm::SIRegisterInfo::isAGPRClass(), llvm::SIRegisterInfo::isSGPRClass(), MRI, and TRI.

◆ satisfied() [1/2]

bool llvm::GCNRPTarget::satisfied ( ) const

inline

Whether the current RP is at or below the defined pressure target.

Definition at line 271 of file GCNRegPressure.h.

References satisfied().

Referenced by satisfied().

◆ satisfied() [2/2]

bool GCNRPTarget::satisfied ( const GCNRegPressure & TestRP ) const

Whether TestRP is at or below the defined pressure target.

Definition at line 451 of file GCNRegPressure.cpp.

References llvm::GCNRegPressure::getSGPRNum(), and llvm::GCNRegPressure::getVGPRNum().

◆ saveReg()

void llvm::GCNRPTarget::saveReg	(	Register	Reg,
		LaneBitmask	Mask,
		const MachineRegisterInfo &	MRI )

inline

Saves virtual register Reg with lanemask Mask.

Definition at line 254 of file GCNRegPressure.h.

References llvm::LaneBitmask::getNone(), MRI, and Reg.

◆ saveRP()

void llvm::GCNRPTarget::saveRP ( const GCNRegPressure & SaveRP )

inline

Saves a total pressure of SaveRP.

Definition at line 263 of file GCNRegPressure.h.

References assert().

◆ setRP()

void llvm::GCNRPTarget::setRP ( const GCNRegPressure & NewRP )

inline

Definition at line 247 of file GCNRegPressure.h.

◆ setTarget()

void GCNRPTarget::setTarget	(	unsigned	NumSGPRs,
		unsigned	NumVGPRs )

Changes the target (same semantics as constructor).

Definition at line 396 of file GCNRegPressure.cpp.

Referenced by GCNRPTarget(), GCNRPTarget(), and GCNRPTarget().

◆ operator<<

raw_ostream & operator<<	(	raw_ostream &	OS,
		const GCNRPTarget &	Target )

friend

Definition at line 280 of file GCNRegPressure.h.

References GCNRPTarget().

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

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

Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

◆ GCNRPTarget() [1/3]

◆ GCNRPTarget() [2/3]

◆ GCNRPTarget() [3/3]

Member Function Documentation

◆ getCurrentRP()

◆ getMaxSGPRs()

◆ getMaxVGPRs()

◆ getNumRegsBenefit()

◆ hasVectorRegisterExcess()

◆ isSaveBeneficial()

◆ satisfied() [1/2]

◆ satisfied() [2/2]

◆ saveReg()

◆ saveRP()

◆ setRP()

◆ setTarget()

Friends And Related Symbol Documentation

◆ operator<<