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
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 102 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 108 of file RegisterPressure.h.

References assert().

Member Function Documentation

dump()

LLVM_DUMP_METHOD void PressureChange::dump

(

)

const

Definition at line 139 of file RegisterPressure.cpp.

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

Referenced by llvm::RegPressureDelta::dump().

getPSet()

unsigned llvm::PressureChange::getPSet ( ) const

inline

Definition at line 114 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 120 of file RegisterPressure.h.

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

getUnitInc()

int llvm::PressureChange::getUnitInc ( ) const

inline

Definition at line 124 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 112 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(), and llvm::tryPressure().

operator==()

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

inline

Definition at line 128 of file RegisterPressure.h.

References RHS.

setUnitInc()

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

inline

Definition at line 126 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