llvm::mca::WriteState Class Reference

Tracks uses of a register definition (e.g. More...

#include "llvm/MCA/Instruction.h"

Public Member Functions
	WriteState (const WriteDescriptor &Desc, MCPhysReg RegID, bool clearsSuperRegs=false, bool writesZero=false)
	WriteState (const WriteState &Other)=default
WriteState &	operator= (const WriteState &Other)=default
int	getCyclesLeft () const
unsigned	getWriteResourceID () const
MCPhysReg	getRegisterID () const
void	setRegisterID (const MCPhysReg RegID)
unsigned	getRegisterFileID () const
unsigned	getLatency () const
unsigned	getDependentWriteCyclesLeft () const
const WriteState *	getDependentWrite () const
const CriticalDependency &	getCriticalRegDep () const
void	addUser (unsigned IID, ReadState *Use, int ReadAdvance)
void	addUser (unsigned IID, WriteState *Use)
unsigned	getNumUsers () const
bool	clearsSuperRegisters () const
bool	isWriteZero () const
bool	isEliminated () const
bool	isReady () const
bool	isExecuted () const
void	setDependentWrite (const WriteState *Other)
void	writeStartEvent (unsigned IID, MCPhysReg RegID, unsigned Cycles)
void	setWriteZero ()
void	setEliminated ()
void	setPRF (unsigned PRF)
void	cycleEvent ()
void	onInstructionIssued (unsigned IID)
void	dump () const

Detailed Description

Tracks uses of a register definition (e.g.

register write).

Each implicit/explicit register write is associated with an instance of this class. A WriteState object tracks the dependent users of a register write. It also tracks how many cycles are left before the write back stage.

Definition at line 197 of file Instruction.h.

Constructor & Destructor Documentation

WriteState() [1/2]

llvm::mca::WriteState::WriteState ( const WriteDescriptor &  Desc, MCPhysReg  RegID, bool  clearsSuperRegs = false, bool  writesZero = false  )

inline

Definition at line 248 of file Instruction.h.

WriteState() [2/2]

llvm::mca::WriteState::WriteState ( const WriteState &  Other )

default

Member Function Documentation

addUser() [1/2]

void llvm::mca::WriteState::addUser	(	unsigned	IID,
		ReadState *	Use,
		int	ReadAdvance
	)

Definition at line 72 of file Instruction.cpp.

References llvm::mca::UNKNOWN_CYCLES.

Referenced by llvm::mca::RegisterFile::addRegisterRead(), and llvm::mca::RegisterFile::addRegisterWrite().

addUser() [2/2]

void llvm::mca::WriteState::addUser	(	unsigned	IID,
		WriteState *	Use
	)

Definition at line 85 of file Instruction.cpp.

References assert(), and llvm::mca::UNKNOWN_CYCLES.

clearsSuperRegisters()

bool llvm::mca::WriteState::clearsSuperRegisters ( ) const

inline

Definition at line 287 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::addRegisterWrite(), llvm::mca::RegisterFile::canEliminateMove(), and llvm::mca::RegisterFile::removeRegisterWrite().

cycleEvent()

void llvm::mca::WriteState::cycleEvent

(

)

Definition at line 96 of file Instruction.cpp.

References llvm::mca::UNKNOWN_CYCLES.

dump()

void llvm::mca::WriteState::dump

(

)

const

Definition at line 125 of file Instruction.cpp.

References llvm::dbgs(), getCyclesLeft(), getLatency(), getRegisterID(), and llvm::mca::WriteDescriptor::OpIndex.

Referenced by llvm::mca::WriteRef::dump().

getCriticalRegDep()

const CriticalDependency & llvm::mca::WriteState::getCriticalRegDep ( ) const

inline

Definition at line 268 of file Instruction.h.

getCyclesLeft()

int llvm::mca::WriteState::getCyclesLeft ( ) const

inline

Definition at line 258 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::checkRAWHazards(), dump(), llvm::mca::WriteRef::getWriteBackCycle(), and llvm::mca::RegisterFile::removeRegisterWrite().

getDependentWrite()

const WriteState * llvm::mca::WriteState::getDependentWrite ( ) const

inline

Definition at line 267 of file Instruction.h.

getDependentWriteCyclesLeft()

unsigned llvm::mca::WriteState::getDependentWriteCyclesLeft ( ) const

inline

Definition at line 264 of file Instruction.h.

Referenced by isReady().

getLatency()

unsigned llvm::mca::WriteState::getLatency ( ) const

inline

Definition at line 263 of file Instruction.h.

References llvm::mca::WriteDescriptor::Latency.

Referenced by llvm::mca::RegisterFile::addRegisterWrite(), dump(), isReady(), and onInstructionIssued().

getNumUsers()

unsigned llvm::mca::WriteState::getNumUsers ( ) const

inline

Definition at line 280 of file Instruction.h.

References Users.

getRegisterFileID()

unsigned llvm::mca::WriteState::getRegisterFileID ( ) const

inline

Definition at line 262 of file Instruction.h.

getRegisterID()

MCPhysReg llvm::mca::WriteState::getRegisterID ( ) const

inline

Definition at line 260 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::addRegisterWrite(), llvm::mca::RegisterFile::canEliminateMove(), llvm::mca::RegisterFile::collectWrites(), llvm::mca::WriteRef::commit(), dump(), llvm::mca::WriteRef::getRegisterID(), llvm::mca::RegisterFile::removeRegisterWrite(), and llvm::mca::RegisterFile::tryEliminateMoveOrSwap().

getWriteResourceID()

unsigned llvm::mca::WriteState::getWriteResourceID ( ) const

inline

Definition at line 259 of file Instruction.h.

References llvm::mca::WriteDescriptor::SClassOrWriteResourceID.

Referenced by llvm::mca::RegisterFile::checkRAWHazards(), llvm::mca::WriteRef::commit(), and llvm::mca::WriteRef::getWriteResourceID().

isEliminated()

bool llvm::mca::WriteState::isEliminated ( ) const

inline

Definition at line 289 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::addRegisterWrite(), and llvm::mca::RegisterFile::removeRegisterWrite().

isExecuted()

bool llvm::mca::WriteState::isExecuted ( ) const

inline

Definition at line 298 of file Instruction.h.

References llvm::mca::UNKNOWN_CYCLES.

Referenced by llvm::mca::WriteRef::commit(), llvm::mca::WriteRef::hasKnownWriteBackCycle(), and llvm::mca::WriteRef::notifyExecuted().

isReady()

bool llvm::mca::WriteState::isReady ( ) const

inline

Definition at line 291 of file Instruction.h.

References getDependentWriteCyclesLeft(), and getLatency().

isWriteZero()

bool llvm::mca::WriteState::isWriteZero ( ) const

inline

Definition at line 288 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::addRegisterWrite(), llvm::mca::WriteRef::isWriteZero(), and llvm::mca::RegisterFile::removeRegisterWrite().

onInstructionIssued()

void llvm::mca::WriteState::onInstructionIssued

(

unsigned

IID

)

Definition at line 54 of file Instruction.cpp.

References assert(), getLatency(), llvm::mca::UNKNOWN_CYCLES, writeStartEvent(), and llvm::mca::ReadState::writeStartEvent().

operator=()

WriteState & llvm::mca::WriteState::operator= ( const WriteState &  Other )

default

setDependentWrite()

void llvm::mca::WriteState::setDependentWrite ( const WriteState *  Other )

inline

Definition at line 302 of file Instruction.h.

References llvm::Other.

setEliminated()

void llvm::mca::WriteState::setEliminated ( )

inline

Definition at line 305 of file Instruction.h.

References assert(), and Users.

Referenced by llvm::mca::RegisterFile::tryEliminateMoveOrSwap().

setPRF()

void llvm::mca::WriteState::setPRF ( unsigned  PRF )

inline

Definition at line 311 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::addRegisterWrite().

setRegisterID()

void llvm::mca::WriteState::setRegisterID ( const MCPhysReg  RegID )

inline

Definition at line 261 of file Instruction.h.

setWriteZero()

void llvm::mca::WriteState::setWriteZero ( )

inline

Definition at line 304 of file Instruction.h.

Referenced by llvm::mca::RegisterFile::tryEliminateMoveOrSwap().

writeStartEvent()

void llvm::mca::WriteState::writeStartEvent	(	unsigned	IID,
		MCPhysReg	RegID,
		unsigned	Cycles
	)

Definition at line 21 of file Instruction.cpp.

References llvm::mca::CriticalDependency::Cycles, llvm::mca::CriticalDependency::IID, and llvm::mca::CriticalDependency::RegID.

Referenced by onInstructionIssued().

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

• include/llvm/MCA/Instruction.h
• lib/MCA/Instruction.cpp