llvm::PressureChange Class Reference

Capture a change in pressure for a single pressure set. More...

#include "llvm/CodeGen/RegisterPressure.h"

Public Member Functions
	PressureChange ()=default
	PressureChange (unsigned id)
bool	isValid () const
unsigned	getPSet () const
unsigned	getPSetOrMax () const
int	getUnitInc () const
void	setUnitInc (int Inc)
bool	operator== (const PressureChange &RHS) const

Detailed Description

Capture a change in pressure for a single pressure set.

UnitInc may be expressed in terms of upward or downward pressure depending on the client and will be dynamically adjusted for current liveness.

Pressure increments are tiny, typically 1-2 units, and this is only for heuristics, so we don't check UnitInc overflow. Instead, we may have a higher level assert that pressure is consistent within a region. We also effectively ignore dead defs which don't affect heuristics much.

Definition at line 104 of file RegisterPressure.h.

Constructor & Destructor Documentation

PressureChange() [1/2]

llvm::PressureChange::PressureChange ( )

default

PressureChange() [2/2]

llvm::PressureChange::PressureChange ( unsigned  id )

inline

Definition at line 110 of file RegisterPressure.h.

References assert(), and llvm::max().

Member Function Documentation

getPSet()

unsigned llvm::PressureChange::getPSet ( ) const

inline

Definition at line 116 of file RegisterPressure.h.

References assert().

Referenced by llvm::PressureDiff::addPressureChange(), computeLiveOuts(), llvm::PressureDiff::dump(), llvm::RegPressureTracker::getMaxUpwardPressureDelta(), llvm::GenericScheduler::initCandidate(), llvm::ConvergingVLIWScheduler::traceCandidate(), and llvm::GenericSchedulerBase::traceCandidate().

getPSetOrMax()

unsigned llvm::PressureChange::getPSetOrMax ( ) const

inline

Definition at line 122 of file RegisterPressure.h.

References llvm::max().

Referenced by llvm::tryPressure().

getUnitInc()

int llvm::PressureChange::getUnitInc ( ) const

inline

Definition at line 126 of file RegisterPressure.h.

Referenced by llvm::PressureDiff::addPressureChange(), computeLiveOuts(), llvm::PressureDiff::dump(), llvm::RegPressureTracker::getMaxDownwardPressureDelta(), llvm::RegPressureTracker::getMaxUpwardPressureDelta(), llvm::GenericScheduler::initCandidate(), llvm::GCNMaxOccupancySchedStrategy::initialize(), llvm::ConvergingVLIWScheduler::SchedulingCost(), llvm::ConvergingVLIWScheduler::traceCandidate(), llvm::GenericSchedulerBase::traceCandidate(), and llvm::tryPressure().

isValid()

bool llvm::PressureChange::isValid ( ) const

inline

Definition at line 114 of file RegisterPressure.h.

Referenced by llvm::PressureDiffs::addInstruction(), llvm::PressureDiff::addPressureChange(), computeLiveOuts(), computeMaxPressureDelta(), llvm::PressureDiff::dump(), llvm::RegPressureTracker::getMaxUpwardPressureDelta(), llvm::RegPressureTracker::getUpwardPressureDelta(), llvm::GenericScheduler::initCandidate(), llvm::ConvergingVLIWScheduler::traceCandidate(), llvm::GenericSchedulerBase::traceCandidate(), and llvm::tryPressure().

operator==()

bool llvm::PressureChange::operator== ( const PressureChange &  RHS ) const

inline

Definition at line 130 of file RegisterPressure.h.

setUnitInc()

void llvm::PressureChange::setUnitInc ( int  Inc )

inline

Definition at line 128 of file RegisterPressure.h.

Referenced by llvm::PressureDiff::addPressureChange(), computeExcessPressureDelta(), computeMaxPressureDelta(), llvm::RegPressureTracker::getUpwardPressureDelta(), and llvm::GCNMaxOccupancySchedStrategy::initialize().

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

• include/llvm/CodeGen/RegisterPressure.h