Downward RP tracker that relies on program order to advance down the instruction stream. More...

#include "Target/AMDGPU/GCNRegPressure.h"

Inheritance diagram for llvm::GCNDownwardRPTracker:

Public Member Functions
	GCNDownwardRPTracker (LiveIntervals &LIS)
MachineBasicBlock::const_iterator	getNext () const
	Returns the next MI that will be advanced over.
GCNRegPressure	moveMaxPressure ()
	`return` MaxPressure and clear it.
bool	reset (const MachineInstr &MI, MachineBasicBlock::const_iterator End, const LiveRegSet *LiveRegsCopy=nullptr)
	Reset tracker to the point before the `MI` (filling LiveRegs upon this point using `LiveRegsCopy` if provided or LIS otherwise) point using LIS.
bool	advanceBeforeNext ()
	Move to the state right before NextMI or the end of the MBB.
void	advanceToNext ()
	Move to the state at NextMI.
bool	advance ()
	Advance to the state at the next MI in program order.
bool	advance (MachineBasicBlock::const_iterator End)
	Advance in program order until before `End`.
bool	advance (MachineBasicBlock::const_iterator Begin, MachineBasicBlock::const_iterator End, const LiveRegSet *LiveRegsCopy=nullptr)
	Reset tracker to `Begin` (filling LiveRegs upon this point using `LiveRegsCopy` if provided or LIS otherwise) and advance to `End`, which must be between `Begin` and the end of its parent block (inclusive).
void	addDefs (const MachineInstr &MI)
	Adds all lanes (dead or not) defined by `MI's` register operands to CurPressure.
void	reset (const MachineInstr &MI, bool After)
	Resets tracker before or `After` the provided `MI`, which can be a debug instruction.
void	reset (const MachineBasicBlock &MBB, bool End)
	Resets tracker at the start or `End` of the `MBB`.
void	reset (const MachineRegisterInfo &MRI, SlotIndex SI)
	Resets tracker at the specified slot index `SI`.
void	reset (const MachineRegisterInfo &MRI, const LiveRegSet &LiveRegs)
	Resets tracker with the provided `LiveRegs`.
Public Member Functions inherited from llvm::GCNDownwardRPTrackerBase
GCNRegPressure	bumpDownwardPressure (const MachineInstr MI, const SIRegisterInfo TRI) const
	Mostly copy/paste from CodeGen/RegisterPressure.cpp Calculate the impact `MI` will have on CurPressure and.
Public Member Functions inherited from llvm::GCNRPTracker
void	reset (const MachineRegisterInfo &MRI, const LiveRegSet &LiveRegs)
	Resets tracker with the provided `LiveRegs`.
const decltype(LiveRegs) &	getLiveRegs () const
const MachineInstr *	getLastTrackedMI () const
void	clearMaxPressure ()
const GCNRegPressure &	getMaxPressure () const
void	resetMaxPressure ()
GCNRegPressure	getPressure () const
decltype(LiveRegs)	moveLiveRegs ()

Additional Inherited Members
Public Types inherited from llvm::GCNRPTracker
using	LiveRegSet = DenseMap<unsigned, LaneBitmask>
Protected Member Functions inherited from llvm::GCNDownwardRPTrackerBase
	GCNDownwardRPTrackerBase (LiveIntervals &LIS)
void	retireDeadUses (const MachineInstr &MI)
	Retires the lanes of `MI's` used registers that die at `MI`, mirroring RegPressureTracker::advance().
void	retireDeadDefs (const MachineInstr &MI, SlotIndex SI)
	Retires the lanes defined by `MI` that are dead at `SI`, according to LIS.
void	addDefs (const MachineInstr &MI)
	Adds all lanes (dead or not) defined by `MI's` register operands to CurPressure.
Protected Member Functions inherited from llvm::GCNRPTracker
	GCNRPTracker (LiveIntervals &LIS_)
void	reset (const MachineInstr &MI, bool After)
	Resets tracker before or `After` the provided `MI`, which can be a debug instruction.
void	reset (const MachineBasicBlock &MBB, bool End)
	Resets tracker at the start or `End` of the `MBB`.
void	reset (const MachineRegisterInfo &MRI, SlotIndex SI)
	Resets tracker at the specified slot index `SI`.
LaneBitmask	getLastUsedLanes (Register Reg, SlotIndex Pos) const
	Mostly copy/paste from CodeGen/RegisterPressure.cpp.
Protected Attributes inherited from llvm::GCNRPTracker
LiveIntervals &	LIS
LiveRegSet	LiveRegs
GCNRegPressure	CurPressure
GCNRegPressure	MaxPressure
MachineBasicBlock::const_iterator	LastTrackedMI
const MachineRegisterInfo *	MRI = nullptr

Detailed Description

Downward RP tracker that relies on program order to advance down the instruction stream.

Definition at line 427 of file GCNRegPressure.h.

Constructor & Destructor Documentation

◆ GCNDownwardRPTracker()

llvm::GCNDownwardRPTracker::GCNDownwardRPTracker ( LiveIntervals & LIS )

inline

Definition at line 435 of file GCNRegPressure.h.

References llvm::GCNDownwardRPTrackerBase::GCNDownwardRPTrackerBase(), and llvm::GCNRPTracker::LIS.

Member Function Documentation

◆ addDefs()

void GCNDownwardRPTrackerBase::addDefs ( const MachineInstr & MI )

Adds all lanes (dead or not) defined by MI's register operands to CurPressure.

Definition at line 416 of file GCNRegPressure.cpp.

References llvm::GCNRPTracker::MRI, and TRI.

◆ advance() [1/3]

bool GCNDownwardRPTracker::advance ( )

Advance to the state at the next MI in program order.

returns false if it reached end of block.

Definition at line 779 of file GCNRegPressure.cpp.

References advanceBeforeNext(), and advanceToNext().

Referenced by advance(), and advance().

◆ advance() [2/3]

bool GCNDownwardRPTracker::advance	(	MachineBasicBlock::const_iterator	Begin,
		MachineBasicBlock::const_iterator	End,
		const LiveRegSet *	LiveRegsCopy = nullptr )

Reset tracker to Begin (filling LiveRegs upon this point using LiveRegsCopy if provided or LIS otherwise) and advance to End, which must be between Begin and the end of its parent block (inclusive).

returns false if the range [Begin, End) is empty except debug values.

Definition at line 795 of file GCNRegPressure.cpp.

References advance(), llvm::End, and reset().

◆ advance() [3/3]

bool GCNDownwardRPTracker::advance ( MachineBasicBlock::const_iterator End )

Advance in program order until before End.

Returns whether it actually had to advance to reach End.

Definition at line 788 of file GCNRegPressure.cpp.

References advance(), and llvm::End.

◆ advanceBeforeNext()

bool GCNDownwardRPTracker::advanceBeforeNext ( )

Move to the state right before NextMI or the end of the MBB.

This retires defs of LastTrackedMI that are dead after the instruction. Its dead uses were already retired by advanceToNext. returns false if it reached the end of the block.

Definition at line 758 of file GCNRegPressure.cpp.

References assert(), llvm::GCNRPTracker::LastTrackedMI, llvm::GCNRPTracker::LIS, and llvm::GCNDownwardRPTrackerBase::retireDeadDefs().

Referenced by advance(), and llvm::GCNRegPressurePrinter::runOnMachineFunction().

◆ advanceToNext()

void GCNDownwardRPTracker::advanceToNext ( )

Move to the state at NextMI.

This retires the uses that die at NextMI, then adds the register lanes it defines to CurPressure. Has to be called after advanceBeforeNext.

Definition at line 772 of file GCNRegPressure.cpp.

References llvm::GCNDownwardRPTrackerBase::addDefs(), llvm::GCNRPTracker::LastTrackedMI, llvm::GCNDownwardRPTrackerBase::retireDeadUses(), and llvm::skipDebugInstructionsForward().

Referenced by advance(), and llvm::GCNRegPressurePrinter::runOnMachineFunction().

◆ getNext()

MachineBasicBlock::const_iterator llvm::GCNDownwardRPTracker::getNext ( ) const

inline

Returns the next MI that will be advanced over.

Definition at line 441 of file GCNRegPressure.h.

◆ moveMaxPressure()

GCNRegPressure llvm::GCNDownwardRPTracker::moveMaxPressure ( )

inline

return MaxPressure and clear it.

Definition at line 444 of file GCNRegPressure.h.

References llvm::GCNRPTracker::MaxPressure.

◆ reset() [1/5]

void GCNRPTracker::reset	(	const MachineBasicBlock &	MBB,
		bool	End )

Resets tracker at the start or End of the MBB.

Definition at line 326 of file GCNRegPressure.cpp.

◆ reset() [2/5]

void GCNRPTracker::reset	(	const MachineInstr &	MI,
		bool	After )

Resets tracker before or After the provided MI, which can be a debug instruction.

Definition at line 323 of file GCNRegPressure.cpp.

◆ reset() [3/5]

bool GCNDownwardRPTracker::reset	(	const MachineInstr &	MI,
		MachineBasicBlock::const_iterator	End,
		const LiveRegSet *	LiveRegsCopy = nullptr )

Reset tracker to the point before the MI (filling LiveRegs upon this point using LiveRegsCopy if provided or LIS otherwise) point using LIS.

End must be between the MI and the end of its parent block (inclusive). returns false if the range [MI, End) is empty except debug values.

Definition at line 652 of file GCNRegPressure.cpp.

References assert(), llvm::End, MI, llvm::GCNRPTracker::reset(), and llvm::skipDebugInstructionsForward().

Referenced by advance(), and llvm::GCNRegPressurePrinter::runOnMachineFunction().

◆ reset() [4/5]

void GCNRPTracker::reset	(	const MachineRegisterInfo &	MRI,
		const LiveRegSet &	LiveRegs )

Resets tracker with the provided LiveRegs.

Definition at line 335 of file GCNRegPressure.cpp.

◆ reset() [5/5]

void GCNRPTracker::reset	(	const MachineRegisterInfo &	MRI,
		SlotIndex	SI )

Resets tracker at the specified slot index SI.

Definition at line 329 of file GCNRegPressure.cpp.

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

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ GCNDownwardRPTracker()

Member Function Documentation

◆ addDefs()

◆ advance() [1/3]

◆ advance() [2/3]

◆ advance() [3/3]

◆ advanceBeforeNext()

◆ advanceToNext()

◆ getNext()

◆ moveMaxPressure()

◆ reset() [1/5]

◆ reset() [2/5]

◆ reset() [3/5]

◆ reset() [4/5]

◆ reset() [5/5]