#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.
MachineBasicBlock::const_iterator	getPos () const
	Get the MI position corresponding to this register pressure.
void	setPos (MachineBasicBlock::const_iterator Pos)
SlotIndex	getCurrSlot () const
	Get the SlotIndex for the first nondebug instruction including or after the current position.
bool	recede (SmallVectorImpl< unsigned > LiveUses=nullptr, PressureDiff PDiff=nullptr)
	Recede across the previous instruction.
bool	advance ()
	Advance across the current instruction.
void	closeRegion ()
	Finalize the region boundaries and recored live ins and live outs.
void	initLiveThru (const RegPressureTracker &RPTracker)
void	initLiveThru (ArrayRef< unsigned > PressureSet)
	Copy an existing live thru pressure result.
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.
void	discoverLiveIn (unsigned Reg)
	Add Reg to the live in set and increase max pressure.
bool	isTopClosed () const
	Does this pressure result have a valid top position and live ins.
bool	isBottomClosed () const
	Does this pressure result have a valid bottom position and live outs.
void	closeTop ()
	Set the boundary for the top of the region and summarize live ins.
void	closeBottom ()
	Set the boundary for the bottom of the region and summarize live outs.
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.
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.
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.
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 423 of file RegisterPressure.cpp.

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

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

bool RegPressureTracker::advance ( )

Advance across the current instruction.

Definition at line 554 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::ScheduleDAGMILive::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 905 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 707 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 255 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::ScheduleDAGMILive::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 273 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::ScheduleDAGMILive::initRegPressure(), and recede().

void RegPressureTracker::closeTop ( )

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

Definition at line 237 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::ScheduleDAGMILive::initRegPressure().

void RegPressureTracker::decreaseRegPressure ( ArrayRef< unsigned > Regs ) [protected]

Simply decrease the current pressure as impacted by these registers.

Definition at line 97 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 431 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 442 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().

LLVM_DUMP_METHOD void RegPressureTracker::dump ( ) const

Definition at line 73 of file RegisterPressure.cpp.

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

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

SlotIndex RegPressureTracker::getCurrSlot ( ) const

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

Definition at line 227 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 992 of file RegisterPressure.cpp.

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

Referenced by getPressureAfterInst().

const LiveRange * RegPressureTracker::getLiveRange ( unsigned Reg ) const [protected]

Definition at line 151 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 339 of file RegisterPressure.h.

Referenced by llvm::ScheduleDAGMILive::initRegPressure(), and llvm::ScheduleDAGMILive::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 953 of file RegisterPressure.cpp.

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

Referenced by getMaxPressureDelta(), and llvm::GenericScheduler::tryCandidate().

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 388 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 756 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::AArch64CC::MI.

Referenced by getMaxPressureDelta(), and llvm::GenericScheduler::tryCandidate().

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::ScheduleDAGMILive::initRegPressure(), llvm::ScheduleDAGMILive::schedule(), llvm::ScheduleDAGMILive::scheduleMI(), and llvm::ScheduleDAGMILive::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 344 of file RegisterPressure.h.

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

const RegisterPressure& llvm::RegPressureTracker::getPressure ( ) const [inline]

Definition at line 345 of file RegisterPressure.h.

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

Definition at line 411 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 349 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 976 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 824 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(), and llvm::GenericScheduler::tryCandidate().

bool llvm::RegPressureTracker::hasUntiedDef ( unsigned VirtReg ) const [inline]

Definition at line 421 of file RegisterPressure.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::count().

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 83 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 178 of file RegisterPressure.cpp.

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

Referenced by llvm::ScheduleDAGMILive::buildDAGWithRegPressure(), and llvm::ScheduleDAGMILive::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 290 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::ScheduleDAGMILive::initRegPressure().

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

Copy an existing live thru pressure result.

Definition at line 335 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 219 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 211 of file RegisterPressure.cpp.

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

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

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 457 of file RegisterPressure.cpp.

References llvm::PressureDiff::addPressureChange(), 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(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::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::ScheduleDAGMILive::buildDAGWithRegPressure(), llvm::ScheduleDAGInstrs::buildSchedGraph(), llvm::ScheduleDAGMILive::initRegPressure(), and llvm::ScheduleDAGMILive::scheduleMI().

void RegPressureTracker::reset ( )

Definition at line 157 of file RegisterPressure.cpp.

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

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

void llvm::RegPressureTracker::setPos ( MachineBasicBlock::const_iterator Pos ) [inline]

Definition at line 314 of file RegisterPressure.h.

Referenced by llvm::ScheduleDAGMILive::schedule(), and llvm::ScheduleDAGMILive::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