Common behavior for downward RP trackers. Unconstructible directly. More...

#include "Target/AMDGPU/GCNRegPressure.h"

Inheritance diagram for llvm::GCNDownwardRPTrackerBase:

Public Member Functions
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 ()
void	setPressureCallback (std::function< void(const GCNRegPressure &)> CB)
	Sets a function that the tracker calls with the pressure of every program point that it folds into the maximum pressure.
GCNRegPressure	getPressure () const
decltype(LiveRegs)	moveLiveRegs ()

Protected Member Functions
	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	updateMaxPressure (const GCNRegPressure &RP)
	Folds the pressure `RP` of one program point into MaxPressure and passes it to the pressure callback.
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.

Additional Inherited Members
Public Types inherited from llvm::GCNRPTracker
using	LiveRegSet = DenseMap<unsigned, LaneBitmask>
Protected Attributes inherited from llvm::GCNRPTracker
LiveIntervals &	LIS
LiveRegSet	LiveRegs
GCNRegPressure	CurPressure
GCNRegPressure	MaxPressure
MachineBasicBlock::const_iterator	LastTrackedMI
const MachineRegisterInfo *	MRI = nullptr
std::function< void(const GCNRegPressure &)>	PressureCallback

Detailed Description

Common behavior for downward RP trackers. Unconstructible directly.

Definition at line 432 of file GCNRegPressure.h.

Constructor & Destructor Documentation

◆ GCNDownwardRPTrackerBase()

llvm::GCNDownwardRPTrackerBase::GCNDownwardRPTrackerBase ( LiveIntervals & LIS )

inlineprotected

Definition at line 442 of file GCNRegPressure.h.

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

Referenced by llvm::GCNDownwardRPTracker::GCNDownwardRPTracker(), and llvm::GCNManualDownwardRPTracker::GCNManualDownwardRPTracker().

Member Function Documentation

◆ addDefs()

void GCNDownwardRPTrackerBase::addDefs ( const MachineInstr & MI )

protected

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

Definition at line 741 of file GCNRegPressure.cpp.

References assert(), llvm::GCNRPTracker::CurPressure, getDefRegMask(), llvm::GCNRPTracker::LiveRegs, MI, llvm::GCNRPTracker::MRI, and llvm::GCNRPTracker::updateMaxPressure().

Referenced by llvm::GCNManualDownwardRPTracker::advance(), and llvm::GCNDownwardRPTracker::advanceToNext().

◆ bumpDownwardPressure()

GCNRegPressure GCNDownwardRPTrackerBase::bumpDownwardPressure	(	const MachineInstr *	MI,
		const SIRegisterInfo *	TRI ) const

Mostly copy/paste from CodeGen/RegisterPressure.cpp Calculate the impact MI will have on CurPressure and.

Returns: the speculated pressure. In order to support RP Speculation, this does not rely on the implicit program ordering in the LiveIntervals.

Definition at line 838 of file GCNRegPressure.cpp.

References llvm::RegisterOperands::adjustLaneLiveness(), assert(), llvm::RegisterOperands::collect(), llvm::GCNRPTracker::CurPressure, llvm::RegisterOperands::Defs, llvm::DenseMapBase< StorageT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< StorageT, KeyT, ValueT, KeyInfoT, BucketT >::find(), findUseBetween(), llvm::GCNRPTracker::getLastUsedLanes(), llvm::GCNRegPressure::inc(), llvm::GCNRPTracker::LastTrackedMI, llvm::GCNRPTracker::LIS, llvm::GCNRPTracker::LiveRegs, MBB, MI, llvm::GCNRPTracker::MRI, llvm::LaneBitmask::none(), llvm::skipDebugInstructionsForward(), TRI, and llvm::RegisterOperands::Uses.

◆ retireDeadDefs()

void GCNDownwardRPTrackerBase::retireDeadDefs	(	const MachineInstr &	MI,
		SlotIndex	SI )

protected

Retires the lanes defined by MI that are dead at SI, according to LIS.

Definition at line 727 of file GCNRegPressure.cpp.

References assert(), llvm::GCNRPTracker::CurPressure, llvm::SmallSet< T, N, C >::insert(), MI, llvm::GCNRPTracker::MRI, and llvm::GCNRPTracker::updateMaxPressure().

Referenced by llvm::GCNManualDownwardRPTracker::advance(), and llvm::GCNDownwardRPTracker::advanceBeforeNext().

◆ retireDeadUses()

void GCNDownwardRPTrackerBase::retireDeadUses ( const MachineInstr & MI )

protected

Retires the lanes of MI's used registers that die at MI, mirroring RegPressureTracker::advance().

Early-clobber defs of MI are accounted in MaxPressure as live together with all of its uses. The uses of a PHI are not retired since they do not die there.

Definition at line 700 of file GCNRegPressure.cpp.

References assert(), llvm::GCNRPTracker::CurPressure, getDefRegMask(), llvm::LaneBitmask::getNone(), llvm::GCNRegPressure::inc(), llvm::SmallSet< T, N, C >::insert(), llvm::GCNRPTracker::LIS, MI, llvm::GCNRPTracker::MRI, and llvm::GCNRPTracker::updateMaxPressure().

Referenced by llvm::GCNManualDownwardRPTracker::advance(), and llvm::GCNDownwardRPTracker::advanceToNext().

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

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

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ GCNDownwardRPTrackerBase()

Member Function Documentation

◆ addDefs()

◆ bumpDownwardPressure()

◆ retireDeadDefs()

◆ retireDeadUses()