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
LLVM_ABI void	dump () 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 103 of file RegisterPressure.h.

Constructor & Destructor Documentation

PressureChange() [1/2]

llvm::PressureChange::PressureChange ( )

default

Referenced by operator==().

PressureChange() [2/2]

llvm::PressureChange::PressureChange ( unsigned id )

inline

Definition at line 109 of file RegisterPressure.h.

References assert().

Member Function Documentation

dump()

LLVM_DUMP_METHOD void PressureChange::dump

(

)

const

Definition at line 135 of file RegisterPressure.cpp.

References llvm::dbgs(), getPSetOrMax(), and getUnitInc().

getPSet()

unsigned llvm::PressureChange::getPSet ( ) const

inline

Definition at line 115 of file RegisterPressure.h.

References assert(), and isValid().

Referenced by llvm::PressureDiff::dump(), llvm::RegPressureTracker::getMaxUpwardPressureDelta(), and llvm::GenericScheduler::initCandidate().

getPSetOrMax()

unsigned llvm::PressureChange::getPSetOrMax ( ) const

inline

Definition at line 121 of file RegisterPressure.h.

Referenced by dump(), and llvm::tryPressure().

getUnitInc()

int llvm::PressureChange::getUnitInc ( ) const

inline

Definition at line 125 of file RegisterPressure.h.

Referenced by dump(), llvm::PressureDiff::dump(), llvm::RegPressureTracker::getMaxDownwardPressureDelta(), llvm::RegPressureTracker::getMaxUpwardPressureDelta(), llvm::GenericScheduler::initCandidate(), llvm::ConvergingVLIWScheduler::SchedulingCost(), and llvm::tryPressure().

isValid()

bool llvm::PressureChange::isValid ( ) const

inline

Definition at line 113 of file RegisterPressure.h.

Referenced by llvm::PressureDiffs::addInstruction(), llvm::PressureDiff::addPressureChange(), computeMaxPressureDelta(), llvm::PressureDiff::dump(), llvm::RegPressureTracker::getMaxUpwardPressureDelta(), getPSet(), llvm::RegPressureTracker::getUpwardPressureDelta(), llvm::GenericScheduler::initCandidate(), llvm::tryPressure(), and llvm::ScheduleDAGMILive::updatePressureDiffs().

operator==()

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

inline

Definition at line 129 of file RegisterPressure.h.

References PressureChange(), and RHS.

setUnitInc()

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

inline

Definition at line 127 of file RegisterPressure.h.

Referenced by computeExcessPressureDelta(), computeMaxPressureDelta(), llvm::RegPressureTracker::getUpwardPressureDelta(), and llvm::GCNSchedStrategy::initCandidate().

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

• include/llvm/CodeGen/RegisterPressure.h
• lib/CodeGen/RegisterPressure.cpp