#include <RegisterPressure.h>

Public Member Functions
	RegPressureTracker (IntervalPressure &rp)

	RegPressureTracker (RegionPressure &rp)

void	reset ()

void	init (const MachineFunction mf, const RegisterClassInfo rci, const LiveIntervals lis, const MachineBasicBlock mbb, MachineBasicBlock::const_iterator pos, bool ShouldTrackUntiedDefs=false)

void	addLiveRegs (ArrayRef< unsigned > Regs)
	Force liveness of registers. More...

MachineBasicBlock::const_iterator	getPos () const
	Get the MI position corresponding to this register pressure. More...

void	setPos (MachineBasicBlock::const_iterator Pos)

SlotIndex	getCurrSlot () const
	Get the SlotIndex for the first nondebug instruction including or after the current position. More...

bool	recede (SmallVectorImpl< unsigned > LiveUses=0, PressureDiff PDiff=0)
	Recede across the previous instruction. More...

bool	advance ()
	Advance across the current instruction. More...

void	closeRegion ()
	Finalize the region boundaries and recored live ins and live outs. More...

void	initLiveThru (const RegPressureTracker &RPTracker)

void	initLiveThru (ArrayRef< unsigned > PressureSet)
	Copy an existing live thru pressure result. More...

ArrayRef< unsigned >	getLiveThru () const

RegisterPressure &	getPressure ()

const RegisterPressure &	getPressure () const

std::vector< unsigned > &	getRegSetPressureAtPos ()

void	discoverLiveOut (unsigned Reg)
	Add Reg to the live out set and increase max pressure. More...

void	discoverLiveIn (unsigned Reg)
	Add Reg to the live in set and increase max pressure. More...

bool	isTopClosed () const
	Does this pressure result have a valid top position and live ins. More...

bool	isBottomClosed () const
	Does this pressure result have a valid bottom position and live outs. More...

void	closeTop ()
	Set the boundary for the top of the region and summarize live ins. More...

void	closeBottom ()
	Set the boundary for the bottom of the region and summarize live outs. More...

void	getMaxUpwardPressureDelta (const MachineInstr MI, PressureDiff PDiff, RegPressureDelta &Delta, ArrayRef< PressureChange > CriticalPSets, ArrayRef< unsigned > MaxPressureLimit)

void	getUpwardPressureDelta (const MachineInstr *MI, PressureDiff &PDiff, RegPressureDelta &Delta, ArrayRef< PressureChange > CriticalPSets, ArrayRef< unsigned > MaxPressureLimit) const

void	getMaxDownwardPressureDelta (const MachineInstr *MI, RegPressureDelta &Delta, ArrayRef< PressureChange > CriticalPSets, ArrayRef< unsigned > MaxPressureLimit)

void	getMaxPressureDelta (const MachineInstr *MI, RegPressureDelta &Delta, ArrayRef< PressureChange > CriticalPSets, ArrayRef< unsigned > MaxPressureLimit)

void	getUpwardPressure (const MachineInstr *MI, std::vector< unsigned > &PressureResult, std::vector< unsigned > &MaxPressureResult)
	Get the pressure of each PSet after traversing this instruction bottom-up. More...

void	getDownwardPressure (const MachineInstr *MI, std::vector< unsigned > &PressureResult, std::vector< unsigned > &MaxPressureResult)
	Get the pressure of each PSet after traversing this instruction top-down. More...

void	getPressureAfterInst (const MachineInstr *MI, std::vector< unsigned > &PressureResult, std::vector< unsigned > &MaxPressureResult)

bool	hasUntiedDef (unsigned VirtReg) const

void	dump () const

Protected Member Functions
const LiveRange *	getLiveRange (unsigned Reg) const

void	increaseRegPressure (ArrayRef< unsigned > Regs)

void	decreaseRegPressure (ArrayRef< unsigned > Regs)
	Simply decrease the current pressure as impacted by these registers. More...

void	bumpUpwardPressure (const MachineInstr *MI)

void	bumpDownwardPressure (const MachineInstr *MI)

Detailed Description

Track the current register pressure at some position in the instruction stream, and remember the high water mark within the region traversed. This does not automatically consider live-through ranges. The client may independently adjust for global liveness.

Each RegPressureTracker only works within a MachineBasicBlock. Pressure can be tracked across a larger region by storing a RegisterPressure result at each block boundary and explicitly adjusting pressure to account for block live-in and live-out register sets.

RegPressureTracker holds a reference to a RegisterPressure result that it computes incrementally. During downward tracking, P.BottomIdx or P.BottomPos is invalid until it reaches the end of the block or closeRegion() is explicitly called. Similarly, P.TopIdx is invalid during upward tracking. Changing direction has the side effect of closing region, and traversing past TopIdx or BottomIdx reopens it.

Definition at line 250 of file RegisterPressure.h.

Constructor & Destructor Documentation

llvm::RegPressureTracker::RegPressureTracker ( IntervalPressure & rp )

inline

Definition at line 287 of file RegisterPressure.h.

llvm::RegPressureTracker::RegPressureTracker ( RegionPressure & rp )

inline

Definition at line 291 of file RegisterPressure.h.

Member Function Documentation

void RegPressureTracker::addLiveRegs ( ArrayRef< unsigned > Regs )

Force liveness of registers.

Force liveness of virtual registers or physical register units. Particularly useful to initialize the livein/out state of the tracker before the first call to advance/recede.

Definition at line 422 of file RegisterPressure.cpp.

References increaseRegPressure(), llvm::LiveRegSet::insert(), and llvm::ArrayRef< T >::size().

Referenced by llvm::ScheduleDAGMI::initRegPressure().

bool RegPressureTracker::advance ( )

Advance across the current instruction.

Definition at line 547 of file RegisterPressure.cpp.

References closeRegion(), closeTop(), collectOperands(), llvm::LiveRegSet::contains(), RegisterOperands::DeadDefs, decreaseRegPressure(), RegisterOperands::Defs, discoverLiveIn(), llvm::MachineBasicBlock::end(), llvm::LiveRegSet::erase(), getCurrSlot(), getLiveRange(), increaseRegPressure(), llvm::LiveRegSet::insert(), isBottomClosed(), llvm::LiveQueryResult::isKill(), isTopClosed(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm::LiveRange::Query(), llvm::SmallVectorTemplateCommon< T, typename >::size(), and RegisterOperands::Uses.

Referenced by llvm::ScheduleDAGMI::scheduleMI().

void RegPressureTracker::bumpDownwardPressure ( const MachineInstr * MI )

protected

Record the downward impact of a single instruction on current register pressure. Unlike the advance/recede pressure tracking interface, this does not discover live in/outs.

This is intended for speculative queries. It leaves pressure inconsistent with the current position, so must be restored by the caller.

Definition at line 898 of file RegisterPressure.cpp.

References collectOperands(), decreaseRegPressure(), findUseBetween(), getCurrSlot(), llvm::LiveIntervals::getInstructionIndex(), getLiveRange(), llvm::SlotIndex::getRegSlot(), increaseRegPressure(), llvm::MachineInstr::isDebugValue(), llvm::LiveQueryResult::isKill(), llvm::TargetRegisterInfo::isVirtualRegister(), and llvm::LiveRange::Query().

Referenced by getDownwardPressure(), and getMaxDownwardPressureDelta().

void RegPressureTracker::bumpUpwardPressure ( const MachineInstr * MI )

protected

Record the upward impact of a single instruction on current register pressure. Unlike the advance/recede pressure tracking interface, this does not discover live in/outs.

This is intended for speculative queries. It leaves pressure inconsistent with the current position, so must be restored by the caller.

Definition at line 700 of file RegisterPressure.cpp.

References collectOperands(), llvm::LiveRegSet::contains(), containsReg(), decreaseRegPressure(), llvm::LiveIntervals::getInstructionIndex(), getLiveRange(), increaseRegPressure(), llvm::LiveQueryResult::isDeadDef(), llvm::MachineInstr::isDebugValue(), and llvm::LiveRange::Query().

Referenced by getMaxUpwardPressureDelta(), and getUpwardPressure().

void RegPressureTracker::closeBottom ( )

Set the boundary for the bottom of the region and summarize live outs.

Definition at line 254 of file RegisterPressure.cpp.

References llvm::SmallVectorImpl< T >::append(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin(), llvm::SmallVectorBase::empty(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), llvm::SmallVectorImpl< T >::erase(), getCurrSlot(), I, llvm::RegisterPressure::LiveOutRegs, llvm::LiveRegSet::PhysRegs, llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), llvm::SmallVectorImpl< T >::reserve(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::size(), and llvm::LiveRegSet::VirtRegs.

Referenced by closeRegion(), llvm::ScheduleDAGMI::initRegPressure(), and recede().

void RegPressureTracker::closeRegion ( )

Finalize the region boundaries and recored live ins and live outs.

Finalize the region boundaries and record live ins and live outs.

Definition at line 272 of file RegisterPressure.cpp.

References closeBottom(), closeTop(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::empty(), isBottomClosed(), isTopClosed(), llvm::LiveRegSet::PhysRegs, and llvm::LiveRegSet::VirtRegs.

Referenced by advance(), llvm::ScheduleDAGMI::initRegPressure(), and recede().

void RegPressureTracker::closeTop ( )

Set the boundary for the top of the region and summarize live ins.

Definition at line 236 of file RegisterPressure.cpp.

References llvm::SmallVectorImpl< T >::append(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin(), llvm::SmallVectorBase::empty(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), llvm::SmallVectorImpl< T >::erase(), getCurrSlot(), I, llvm::RegisterPressure::LiveInRegs, llvm::LiveRegSet::PhysRegs, llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), llvm::SmallVectorImpl< T >::reserve(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::size(), and llvm::LiveRegSet::VirtRegs.

Referenced by advance(), closeRegion(), and llvm::ScheduleDAGMI::initRegPressure().

void RegPressureTracker::decreaseRegPressure ( ArrayRef< unsigned > Regs )

protected

Simply decrease the current pressure as impacted by these registers.

Definition at line 96 of file RegisterPressure.cpp.

References decreaseSetPressure(), llvm::MachineRegisterInfo::getPressureSets(), I, and llvm::ArrayRef< T >::size().

Referenced by advance(), bumpDownwardPressure(), bumpUpwardPressure(), and recede().

void RegPressureTracker::discoverLiveIn ( unsigned Reg )

Add Reg to the live in set and increase max pressure.

Definition at line 430 of file RegisterPressure.cpp.

References llvm::LiveRegSet::contains(), containsReg(), llvm::MachineRegisterInfo::getPressureSets(), increaseSetPressure(), llvm::RegisterPressure::LiveInRegs, llvm::RegisterPressure::MaxSetPressure, and llvm::SmallVectorTemplateBase< T, isPodLike >::push_back().

Referenced by advance().

void RegPressureTracker::discoverLiveOut ( unsigned Reg )

Add Reg to the live out set and increase max pressure.

Definition at line 441 of file RegisterPressure.cpp.

References llvm::LiveRegSet::contains(), containsReg(), llvm::MachineRegisterInfo::getPressureSets(), increaseSetPressure(), llvm::RegisterPressure::LiveOutRegs, llvm::RegisterPressure::MaxSetPressure, and llvm::SmallVectorTemplateBase< T, isPodLike >::push_back().

Referenced by recede().

void RegPressureTracker::dump ( ) const

Definition at line 71 of file RegisterPressure.cpp.

References llvm::dbgs(), llvm::RegisterPressure::dump(), llvm::dumpRegSetPressure(), isBottomClosed(), and isTopClosed().

Referenced by llvm::ScheduleDAGMI::initRegPressure().

SlotIndex RegPressureTracker::getCurrSlot ( ) const

Get the SlotIndex for the first nondebug instruction including or after the current position.

Definition at line 226 of file RegisterPressure.cpp.

References llvm::MachineBasicBlock::end(), llvm::LiveIntervals::getInstructionIndex(), llvm::LiveIntervals::getMBBEndIdx(), and llvm::SlotIndex::getRegSlot().

Referenced by advance(), bumpDownwardPressure(), closeBottom(), and closeTop().

void RegPressureTracker::getDownwardPressure	(	const MachineInstr *	MI,
		std::vector< unsigned > &	PressureResult,
		std::vector< unsigned > &	MaxPressureResult
	)

Get the pressure of each PSet after traversing this instruction top-down.

Definition at line 985 of file RegisterPressure.cpp.

References bumpDownwardPressure(), and llvm::RegisterPressure::MaxSetPressure.

Referenced by getPressureAfterInst().

const LiveRange * RegPressureTracker::getLiveRange ( unsigned Reg ) const

protected

Definition at line 150 of file RegisterPressure.cpp.

References llvm::LiveIntervals::getCachedRegUnit(), llvm::LiveIntervals::getInterval(), and llvm::TargetRegisterInfo::isVirtualRegister().

Referenced by advance(), bumpDownwardPressure(), bumpUpwardPressure(), and recede().

ArrayRef<unsigned> llvm::RegPressureTracker::getLiveThru ( ) const

inline

Definition at line 338 of file RegisterPressure.h.

Referenced by llvm::ScheduleDAGMI::initRegPressure(), and llvm::ScheduleDAGMI::updateScheduledPressure().

void RegPressureTracker::getMaxDownwardPressureDelta	(	const MachineInstr *	MI,
		RegPressureDelta &	Delta,
		ArrayRef< PressureChange >	CriticalPSets,
		ArrayRef< unsigned >	MaxPressureLimit
	)

Consider the pressure increase caused by traversing this instruction top-down. Find the pressure set with the most change beyond its pressure limit based on the tracker's current pressure, and record the number of excess register units of that pressure set introduced by this instruction.

Consider the pressure increase caused by traversing this instruction top-down. Find the register class with the most change in its pressure limit based on the tracker's current pressure, and return the number of excess register units of that pressure set introduced by this instruction.

This assumes that the current LiveIn set is sufficient.

Definition at line 946 of file RegisterPressure.cpp.

References bumpDownwardPressure(), computeExcessPressureDelta(), computeMaxPressureDelta(), llvm::RegPressureDelta::CriticalMax, llvm::RegPressureDelta::CurrentMax, llvm::PressureChange::getUnitInc(), and llvm::RegisterPressure::MaxSetPressure.

Referenced by getMaxPressureDelta().

void llvm::RegPressureTracker::getMaxPressureDelta	(	const MachineInstr *	MI,
		RegPressureDelta &	Delta,
		ArrayRef< PressureChange >	CriticalPSets,
		ArrayRef< unsigned >	MaxPressureLimit
	)

inline

Find the pressure set with the most change beyond its pressure limit after traversing this instruction either upward or downward depending on the closed end of the current region.

Definition at line 387 of file RegisterPressure.h.

References getMaxDownwardPressureDelta(), getMaxUpwardPressureDelta(), isBottomClosed(), and isTopClosed().

void RegPressureTracker::getMaxUpwardPressureDelta	(	const MachineInstr *	MI,
		PressureDiff *	PDiff,
		RegPressureDelta &	Delta,
		ArrayRef< PressureChange >	CriticalPSets,
		ArrayRef< unsigned >	MaxPressureLimit
	)

Consider the pressure increase caused by traversing this instruction bottom-up. Find the pressure set with the most change beyond its pressure limit based on the tracker's current pressure, and record the number of excess register units of that pressure set introduced by this instruction.

Consider the pressure increase caused by traversing this instruction bottom-up. Find the pressure set with the most change beyond its pressure limit based on the tracker's current pressure, and return the change in number of register units of that pressure set introduced by this instruction.

This assumes that the current LiveOut set is sufficient.

FIXME: This is expensive for an on-the-fly query. We need to cache the result per-SUnit with enough information to adjust for the current scheduling position. But this works as a proof of concept.

Definition at line 749 of file RegisterPressure.cpp.

References bumpUpwardPressure(), computeExcessPressureDelta(), computeMaxPressureDelta(), llvm::RegPressureDelta::CriticalMax, llvm::RegPressureDelta::CurrentMax, llvm::dbgs(), llvm::RegPressureDelta::Excess, llvm::PressureChange::getPSet(), llvm::TargetRegisterInfo::getRegPressureSetName(), llvm::PressureChange::getUnitInc(), getUpwardPressureDelta(), llvm::PressureChange::isValid(), llvm_unreachable, llvm::RegisterPressure::MaxSetPressure, and llvm::A64CC::MI.

Referenced by getMaxPressureDelta().

MachineBasicBlock::const_iterator llvm::RegPressureTracker::getPos ( ) const

inline

Get the MI position corresponding to this register pressure.

Definition at line 308 of file RegisterPressure.h.

Referenced by llvm::ScheduleDAGInstrs::buildSchedGraph(), llvm::ScheduleDAGMI::initQueues(), llvm::ScheduleDAGMI::initRegPressure(), llvm::ScheduleDAGMI::scheduleMI(), and llvm::ScheduleDAGMI::updatePressureDiffs().

RegisterPressure& llvm::RegPressureTracker::getPressure ( )

inline

Get the resulting register pressure over the traversed region. This result is complete if either advance() or recede() has returned true, or if closeRegion() was explicitly invoked.

Definition at line 343 of file RegisterPressure.h.

Referenced by llvm::ScheduleDAGMI::computeCyclicCriticalPath(), llvm::ScheduleDAGMI::initRegPressure(), and llvm::ScheduleDAGMI::scheduleMI().

const RegisterPressure& llvm::RegPressureTracker::getPressure ( ) const

inline

Definition at line 344 of file RegisterPressure.h.

void llvm::RegPressureTracker::getPressureAfterInst	(	const MachineInstr *	MI,
		std::vector< unsigned > &	PressureResult,
		std::vector< unsigned > &	MaxPressureResult
	)

inline

Definition at line 410 of file RegisterPressure.h.

References getDownwardPressure(), getUpwardPressure(), isBottomClosed(), and isTopClosed().

std::vector<unsigned>& llvm::RegPressureTracker::getRegSetPressureAtPos ( )

inline

Get the register set pressure at the current position, which may be less than the pressure across the traversed region.

Definition at line 348 of file RegisterPressure.h.

void RegPressureTracker::getUpwardPressure	(	const MachineInstr *	MI,
		std::vector< unsigned > &	PressureResult,
		std::vector< unsigned > &	MaxPressureResult
	)

Get the pressure of each PSet after traversing this instruction bottom-up.

Definition at line 969 of file RegisterPressure.cpp.

References bumpUpwardPressure(), and llvm::RegisterPressure::MaxSetPressure.

Referenced by getPressureAfterInst().

void RegPressureTracker::getUpwardPressureDelta	(	const MachineInstr *	MI,
		PressureDiff &	PDiff,
		RegPressureDelta &	Delta,
		ArrayRef< PressureChange >	CriticalPSets,
		ArrayRef< unsigned >	MaxPressureLimit
	)		const

This is a prototype of the fast version of querying register pressure that does not directly depend on current liveness. It's still slow because we recompute pressure change on-the-fly. This implementation only exists to prove correctness.

Parameters

Delta	captures information needed for heuristics.
CriticalPSets	Are the pressure sets that are known to exceed some limit within the region, not necessarily at the current position.
MaxPressureLimit	Is the max pressure within the region, not necessarily at the current position.

Definition at line 817 of file RegisterPressure.cpp.

References llvm::PressureDiff::begin(), llvm::RegPressureDelta::CriticalMax, llvm::RegPressureDelta::CurrentMax, llvm::PressureDiff::end(), llvm::RegPressureDelta::Excess, llvm::RegisterClassInfo::getRegPressureSetLimit(), llvm::PressureChange::isValid(), llvm::RegisterPressure::MaxSetPressure, llvm::PressureChange::setUnitInc(), and llvm::ArrayRef< T >::size().

Referenced by getMaxUpwardPressureDelta().

bool llvm::RegPressureTracker::hasUntiedDef ( unsigned VirtReg ) const

inline

Definition at line 420 of file RegisterPressure.h.

Referenced by initLiveThru().

void RegPressureTracker::increaseRegPressure ( ArrayRef< unsigned > RegUnits )

protected

Increase the current pressure as impacted by these registers and bump the high water mark if needed.

Definition at line 82 of file RegisterPressure.cpp.

References llvm::MachineRegisterInfo::getPressureSets(), llvm::PSetIterator::getWeight(), llvm::PSetIterator::isValid(), llvm::RegisterPressure::MaxSetPressure, and llvm::ArrayRef< T >::size().

Referenced by addLiveRegs(), advance(), bumpDownwardPressure(), bumpUpwardPressure(), and recede().

void RegPressureTracker::init	(	const MachineFunction *	mf,
		const RegisterClassInfo *	rci,
		const LiveIntervals *	lis,
		const MachineBasicBlock *	mbb,
		MachineBasicBlock::const_iterator	pos,
		bool	ShouldTrackUntiedDefs = `false`
	)

Setup the RegPressureTracker.

TODO: Add support for pressure without LiveIntervals.

Definition at line 177 of file RegisterPressure.cpp.

References llvm::TargetRegisterInfo::getNumRegPressureSets(), llvm::MCRegisterInfo::getNumRegs(), llvm::MachineRegisterInfo::getNumVirtRegs(), llvm::MachineFunction::getRegInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::MachineFunction::getTarget(), llvm::RegisterPressure::MaxSetPressure, llvm::LiveRegSet::PhysRegs, reset(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::setUniverse(), and llvm::LiveRegSet::VirtRegs.

Referenced by llvm::ScheduleDAGMI::buildDAGWithRegPressure(), and llvm::ScheduleDAGMI::initRegPressure().

void RegPressureTracker::initLiveThru ( const RegPressureTracker & RPTracker )

Initialize the LiveThru pressure set based on the untied defs found in RPTracker.

The register tracker is unaware of global liveness so ignores normal live-thru ranges. However, two-address or coalesced chains can also lead to live ranges with no holes. Count these to inform heuristics that we can never drop below this pressure.

Definition at line 289 of file RegisterPressure.cpp.

References llvm::TargetRegisterInfo::getNumRegPressureSets(), llvm::MachineRegisterInfo::getPressureSets(), hasUntiedDef(), increaseSetPressure(), isBottomClosed(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm::RegisterPressure::LiveOutRegs, and llvm::SmallVectorTemplateCommon< T, typename >::size().

Referenced by llvm::ScheduleDAGMI::initRegPressure().

void llvm::RegPressureTracker::initLiveThru ( ArrayRef< unsigned > PressureSet )

inline

Copy an existing live thru pressure result.

Definition at line 334 of file RegisterPressure.h.

References llvm::ArrayRef< T >::begin(), and llvm::ArrayRef< T >::end().

bool RegPressureTracker::isBottomClosed ( ) const

Does this pressure result have a valid bottom position and live outs.

Definition at line 218 of file RegisterPressure.cpp.

Referenced by advance(), closeRegion(), dump(), getMaxPressureDelta(), getPressureAfterInst(), initLiveThru(), and recede().

bool RegPressureTracker::isTopClosed ( ) const

Does this pressure result have a valid top position and live ins.

Definition at line 210 of file RegisterPressure.cpp.

Referenced by advance(), closeRegion(), dump(), getMaxPressureDelta(), getPressureAfterInst(), and recede().

bool RegPressureTracker::recede	(	SmallVectorImpl< unsigned > *	LiveUses = `0`,
		PressureDiff *	PDiff = `0`
	)

Recede across the previous instruction.

Recede across the previous instruction. If LiveUses is provided, record any RegUnits that are made live by the current instruction's uses. This includes registers that are both defined and used by the instruction. If a pressure difference pointer is provided record the changes is pressure caused by this instruction independent of liveness.

Definition at line 456 of file RegisterPressure.cpp.

References llvm::MachineBasicBlock::begin(), closeBottom(), closeRegion(), collectOperands(), collectPDiff(), llvm::LiveRegSet::contains(), containsReg(), RegisterOperands::DeadDefs, decreaseRegPressure(), RegisterOperands::Defs, discoverLiveOut(), llvm::LiveRegSet::erase(), llvm::LiveIntervals::getInstructionIndex(), getLiveRange(), llvm::SlotIndex::getRegSlot(), increaseRegPressure(), llvm::LiveRegSet::insert(), isBottomClosed(), llvm::LiveQueryResult::isDeadDef(), llvm::LiveQueryResult::isKill(), isTopClosed(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), llvm::LiveRange::Query(), llvm::SmallVectorTemplateCommon< T, typename >::size(), RegisterOperands::Uses, and llvm::LiveQueryResult::valueDefined().

Referenced by llvm::ScheduleDAGMI::buildDAGWithRegPressure(), llvm::ScheduleDAGInstrs::buildSchedGraph(), llvm::ScheduleDAGMI::initRegPressure(), and llvm::ScheduleDAGMI::scheduleMI().

void RegPressureTracker::reset ( )

Definition at line 156 of file RegisterPressure.cpp.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::clear(), llvm::RegisterPressure::MaxSetPressure, llvm::LiveRegSet::PhysRegs, and llvm::LiveRegSet::VirtRegs.

Referenced by llvm::ScheduleDAGMI::buildDAGWithRegPressure(), and init().

void llvm::RegPressureTracker::setPos ( MachineBasicBlock::const_iterator Pos )

inline

Definition at line 314 of file RegisterPressure.h.

Referenced by llvm::ScheduleDAGMI::initQueues(), and llvm::ScheduleDAGMI::scheduleMI().

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

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation