#include <statistical_corrector.hh>

Inheritance diagram for gem5::branch_prediction::StatisticalCorrector:

Classes
struct	BranchInfo

struct	SCThreadHistory

struct	StatisticalCorrectorStats

Public Member Functions
	StatisticalCorrector (const StatisticalCorrectorParams &p)

virtual BranchInfo *	makeBranchInfo ()

virtual SCThreadHistory *	makeThreadHistory ()

virtual void	initBias ()

virtual bool	scPredict (ThreadID tid, Addr branch_pc, bool cond_branch, BranchInfo *bi, bool prev_pred_taken, bool bias_bit, bool use_conf_ctr, int8_t conf_ctr, unsigned conf_bits, int hitBank, int altBank, int64_t phist, int init_lsum=0)

virtual unsigned	getIndBias (Addr branch_pc, BranchInfo *bi, bool b) const

virtual unsigned	getIndBiasSK (Addr branch_pc, BranchInfo *bi) const

virtual unsigned	getIndBiasBank (Addr branch_pc, BranchInfo *bi, int hitBank, int altBank) const =0

virtual unsigned	getIndUpd (Addr branch_pc) const

unsigned	getIndUpds (Addr branch_pc) const

virtual int	gPredictions (ThreadID tid, Addr branch_pc, BranchInfo *bi, int &lsum, int64_t phist)=0

int64_t	gIndex (Addr branch_pc, int64_t bhist, int logs, int nbr, int i)

virtual int	gIndexLogsSubstr (int nbr, int i)=0

int	gPredict (Addr branch_pc, int64_t hist, std::vector< int > &length, std::vector< int8_t > *tab, int nbr, int logs, std::vector< int8_t > &w)

virtual void	gUpdate (Addr branch_pc, bool taken, int64_t hist, std::vector< int > &length, std::vector< int8_t > tab, int nbr, int logs, std::vector< int8_t > &w, BranchInfo bi)

void	initGEHLTable (unsigned numLenghts, std::vector< int > lengths, std::vector< int8_t > *&table, unsigned logNumEntries, std::vector< int8_t > &w, int8_t wInitValue)

virtual void	scHistoryUpdate (Addr branch_pc, const StaticInstPtr &inst, bool taken, BranchInfo *tage_bi, Addr corrTarget)

virtual void	gUpdates (ThreadID tid, Addr pc, bool taken, BranchInfo *bi, int64_t phist)=0

void	init () override
	init() is called after all C++ SimObjects have been created and all ports are connected. More...

void	updateStats (bool taken, BranchInfo *bi)

virtual void	condBranchUpdate (ThreadID tid, Addr branch_pc, bool taken, BranchInfo *bi, Addr corrTarget, bool bias_bit, int hitBank, int altBank, int64_t phist)

virtual size_t	getSizeInBits () const

Public Member Functions inherited from gem5::SimObject
const Params &	params () const

	SimObject (const Params &p)

virtual	~SimObject ()

virtual void	loadState (CheckpointIn &cp)
	loadState() is called on each SimObject when restoring from a checkpoint. More...

virtual void	initState ()
	initState() is called on each SimObject when not restoring from a checkpoint. More...

virtual void	regProbePoints ()
	Register probe points for this object. More...

virtual void	regProbeListeners ()
	Register probe listeners for this object. More...

ProbeManager *	getProbeManager ()
	Get the probe manager for this object. More...

virtual Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID)
	Get a port with a given name and index. More...

virtual void	startup ()
	startup() is the final initialization call before simulation. More...

DrainState	drain () override
	Provide a default implementation of the drain interface for objects that don't need draining. More...

virtual void	memWriteback ()
	Write back dirty buffers to memory using functional writes. More...

virtual void	memInvalidate ()
	Invalidate the contents of memory buffers. More...

void	serialize (CheckpointOut &cp) const override
	Serialize an object. More...

void	unserialize (CheckpointIn &cp) override
	Unserialize an object. More...

Public Member Functions inherited from gem5::EventManager
EventQueue *	eventQueue () const

void	schedule (Event &event, Tick when)

void	deschedule (Event &event)

void	reschedule (Event &event, Tick when, bool always=false)

void	schedule (Event *event, Tick when)

void	deschedule (Event *event)

void	reschedule (Event *event, Tick when, bool always=false)

void	wakeupEventQueue (Tick when=(Tick) -1)
	This function is not needed by the usual gem5 event loop but may be necessary in derived EventQueues which host gem5 on other schedulers. More...

void	setCurTick (Tick newVal)

	EventManager (EventManager &em)
	Event manger manages events in the event queue. More...

	EventManager (EventManager *em)

	EventManager (EventQueue *eq)

Public Member Functions inherited from gem5::Serializable
	Serializable ()

virtual	~Serializable ()

void	serializeSection (CheckpointOut &cp, const char *name) const
	Serialize an object into a new section. More...

void	serializeSection (CheckpointOut &cp, const std::string &name) const

void	unserializeSection (CheckpointIn &cp, const char *name)
	Unserialize an a child object. More...

void	unserializeSection (CheckpointIn &cp, const std::string &name)

Public Member Functions inherited from gem5::Drainable
DrainState	drainState () const
	Return the current drain state of an object. More...

virtual void	notifyFork ()
	Notify a child process of a fork. More...

Public Member Functions inherited from gem5::statistics::Group
	Group (Group parent, const char name=nullptr)
	Construct a new statistics group. More...

virtual	~Group ()

virtual void	regStats ()
	Callback to set stat parameters. More...

virtual void	resetStats ()
	Callback to reset stats. More...

virtual void	preDumpStats ()
	Callback before stats are dumped. More...

void	addStat (statistics::Info *info)
	Register a stat with this group. More...

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object. More...

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object. More...

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block. More...

const Info *	resolveStat (std::string name) const
	Resolve a stat by its name within this group. More...

void	mergeStatGroup (Group *block)
	Merge the contents (stats & children) of a block to this block. More...

	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

Public Member Functions inherited from gem5::Named
	Named (const std::string &name_)

virtual	~Named ()=default

virtual std::string	name () const

Protected Member Functions
template<typename T >
void	ctrUpdate (T &ctr, bool taken, int nbits)

Protected Member Functions inherited from gem5::Drainable
	Drainable ()

virtual	~Drainable ()

virtual void	drainResume ()
	Resume execution after a successful drain. More...

void	signalDrainDone () const
	Signal that an object is drained. More...

Protected Attributes
SCThreadHistory *	scHistory

const unsigned	logBias

const unsigned	logSizeUp

const unsigned	logSizeUps

const unsigned	numEntriesFirstLocalHistories

const unsigned	bwnb

const unsigned	logBwnb

std::vector< int >	bwm

std::vector< int8_t > *	bwgehl

std::vector< int8_t >	wbw

const unsigned	lnb

const unsigned	logLnb

std::vector< int >	lm

std::vector< int8_t > *	lgehl

std::vector< int8_t >	wl

const unsigned	inb

const unsigned	logInb

std::vector< int >	im

std::vector< int8_t > *	igehl

std::vector< int8_t >	wi

std::vector< int8_t >	bias

std::vector< int8_t >	biasSK

std::vector< int8_t >	biasBank

std::vector< int8_t >	wb

int	updateThreshold

std::vector< int >	pUpdateThreshold

const unsigned	chooserConfWidth

const unsigned	updateThresholdWidth

const unsigned	pUpdateThresholdWidth

const unsigned	extraWeightsWidth

const unsigned	scCountersWidth

int8_t	firstH

int8_t	secondH

gem5::branch_prediction::StatisticalCorrector::StatisticalCorrectorStats	stats

Protected Attributes inherited from gem5::SimObject
const SimObjectParams &	_params
	Cached copy of the object parameters. More...

Protected Attributes inherited from gem5::EventManager
EventQueue *	eventq
	A pointer to this object's event queue. More...

Additional Inherited Members
Public Types inherited from gem5::SimObject
typedef SimObjectParams	Params

Static Public Member Functions inherited from gem5::SimObject
static void	serializeAll (const std::string &cpt_dir)
	Create a checkpoint by serializing all SimObjects in the system. More...

static SimObject *	find (const char *name)
	Find the SimObject with the given name and return a pointer to it. More...

static void	setSimObjectResolver (SimObjectResolver *resolver)
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...

static SimObjectResolver *	getSimObjectResolver ()
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...

Static Public Member Functions inherited from gem5::Serializable
static const std::string &	currentSection ()
	Gets the fully-qualified name of the active section. More...

static void	generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
	Generate a checkpoint file so that the serialization can be routed to it. More...

Detailed Description

Definition at line 58 of file statistical_corrector.hh.

Constructor & Destructor Documentation

◆ StatisticalCorrector()

gem5::branch_prediction::StatisticalCorrector::StatisticalCorrector ( const StatisticalCorrectorParams & p )

Definition at line 52 of file statistical_corrector.cc.

References bias, biasBank, biasSK, bwgehl, bwm, bwnb, igehl, im, inb, initGEHLTable(), lgehl, lm, lnb, logBias, logBwnb, logInb, logLnb, logSizeUp, logSizeUps, gem5::VegaISA::p, pUpdateThreshold, updateThreshold, wb, wbw, wi, and wl.

Member Function Documentation

◆ condBranchUpdate()

void gem5::branch_prediction::StatisticalCorrector::condBranchUpdate	(	ThreadID	tid,
		Addr	branch_pc,
		bool	taken,
		BranchInfo *	bi,
		Addr	corrTarget,
		bool	bias_bit,
		int	hitBank,
		int	altBank,
		int64_t	phist
	)

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector.

Definition at line 324 of file statistical_corrector.cc.

References gem5::ArmISA::b, gem5::PowerISA::bi, bias, biasBank, biasSK, chooserConfWidth, ctrUpdate(), extraWeightsWidth, firstH, getIndBias(), getIndBiasBank(), getIndBiasSK(), getIndUpd(), getIndUpds(), gUpdates(), pUpdateThreshold, pUpdateThresholdWidth, scCountersWidth, secondH, updateThreshold, updateThresholdWidth, and wb.

Referenced by gem5::branch_prediction::TAGE_SC_L::update(), and gem5::branch_prediction::MultiperspectivePerceptronTAGE::update().

◆ ctrUpdate()

template<typename T >

void gem5::branch_prediction::StatisticalCorrector::ctrUpdate	(	T &	ctr,
		bool	taken,
		int	nbits
	)

inlineprotected

Definition at line 62 of file statistical_corrector.hh.

Referenced by condBranchUpdate(), gem5::branch_prediction::MPP_StatisticalCorrector::condBranchUpdate(), gUpdate(), and gem5::branch_prediction::MPP_StatisticalCorrector::gUpdate().

◆ getIndBias()

unsigned gem5::branch_prediction::StatisticalCorrector::getIndBias	(	Addr	branch_pc,
		BranchInfo *	bi,
		bool	b
	)		const

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector.

Definition at line 156 of file statistical_corrector.cc.

References gem5::PowerISA::bi, bias, and logBias.

Referenced by condBranchUpdate(), and scPredict().

◆ getIndBiasBank()

virtual unsigned gem5::branch_prediction::StatisticalCorrector::getIndBiasBank	(	Addr	branch_pc,
		BranchInfo *	bi,
		int	hitBank,
		int	altBank
	)		const

pure virtual

Implemented in gem5::branch_prediction::MPP_StatisticalCorrector, gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector, and gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector.

Referenced by condBranchUpdate(), and scPredict().

◆ getIndBiasSK()

unsigned gem5::branch_prediction::StatisticalCorrector::getIndBiasSK	(	Addr	branch_pc,
		BranchInfo *	bi
	)		const

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector.

Definition at line 164 of file statistical_corrector.cc.

References gem5::PowerISA::bi, and logBias.

Referenced by condBranchUpdate(), and scPredict().

◆ getIndUpd()

unsigned gem5::branch_prediction::StatisticalCorrector::getIndUpd ( Addr branch_pc ) const

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector.

Definition at line 171 of file statistical_corrector.cc.

References logSizeUp.

Referenced by condBranchUpdate(), gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector::gPredictions(), and gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector::gPredictions().

◆ getIndUpds()

unsigned gem5::branch_prediction::StatisticalCorrector::getIndUpds ( Addr branch_pc ) const

Definition at line 177 of file statistical_corrector.cc.

References logSizeUps.

Referenced by condBranchUpdate(), gPredict(), gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector::gPredictions(), gUpdate(), and scPredict().

◆ getSizeInBits()

size_t gem5::branch_prediction::StatisticalCorrector::getSizeInBits ( ) const

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector_8KB, and gem5::branch_prediction::MPP_StatisticalCorrector_64KB.

Definition at line 400 of file statistical_corrector.cc.

Referenced by gem5::branch_prediction::MultiperspectivePerceptronTAGE::init().

◆ gIndex()

int64_t gem5::branch_prediction::StatisticalCorrector::gIndex	(	Addr	branch_pc,
		int64_t	bhist,
		int	logs,
		int	nbr,
		int	i
	)

Definition at line 183 of file statistical_corrector.cc.

References gIndexLogsSubstr(), and gem5::ArmISA::i.

Referenced by gPredict(), gUpdate(), and gem5::branch_prediction::MPP_StatisticalCorrector::gUpdate().

◆ gIndexLogsSubstr()

virtual int gem5::branch_prediction::StatisticalCorrector::gIndexLogsSubstr	(	int	nbr,
		int	i
	)

pure virtual

Implemented in gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector, gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector, and gem5::branch_prediction::MPP_StatisticalCorrector.

Referenced by gIndex().

◆ gPredict()

int gem5::branch_prediction::StatisticalCorrector::gPredict	(	Addr	branch_pc,
		int64_t	hist,
		std::vector< int > &	length,
		std::vector< int8_t > *	tab,
		int	nbr,
		int	logs,
		std::vector< int8_t > &	w
	)

Definition at line 193 of file statistical_corrector.cc.

References getIndUpds(), gIndex(), gem5::ArmISA::i, gem5::MipsISA::index, and gem5::VegaISA::w.

Referenced by gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector::gPredictions(), gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector::gPredictions(), gem5::branch_prediction::MPP_StatisticalCorrector_64KB::gPredictions(), and gem5::branch_prediction::MPP_StatisticalCorrector_8KB::gPredictions().

◆ gPredictions()

virtual int gem5::branch_prediction::StatisticalCorrector::gPredictions	(	ThreadID	tid,
		Addr	branch_pc,
		BranchInfo *	bi,
		int &	lsum,
		int64_t	phist
	)

pure virtual

Implemented in gem5::branch_prediction::MPP_StatisticalCorrector_8KB, gem5::branch_prediction::MPP_StatisticalCorrector_64KB, gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector, and gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector.

Referenced by scPredict(), and gem5::branch_prediction::MPP_StatisticalCorrector::scPredict().

◆ gUpdate()

void gem5::branch_prediction::StatisticalCorrector::gUpdate	(	Addr	branch_pc,
		bool	taken,
		int64_t	hist,
		std::vector< int > &	length,
		std::vector< int8_t > *	tab,
		int	nbr,
		int	logs,
		std::vector< int8_t > &	w,
		BranchInfo *	bi
	)

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector.

Definition at line 209 of file statistical_corrector.cc.

References gem5::PowerISA::bi, ctrUpdate(), extraWeightsWidth, getIndUpds(), gIndex(), gem5::ArmISA::i, gem5::MipsISA::index, scCountersWidth, and gem5::VegaISA::w.

Referenced by gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector::gUpdates(), and gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector::gUpdates().

◆ gUpdates()

virtual void gem5::branch_prediction::StatisticalCorrector::gUpdates	(	ThreadID	tid,
		Addr	pc,
		bool	taken,
		BranchInfo *	bi,
		int64_t	phist
	)

pure virtual

Implemented in gem5::branch_prediction::MPP_StatisticalCorrector_8KB, gem5::branch_prediction::MPP_StatisticalCorrector_64KB, gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector, and gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector.

Referenced by condBranchUpdate(), and gem5::branch_prediction::MPP_StatisticalCorrector::condBranchUpdate().

◆ init()

void gem5::branch_prediction::StatisticalCorrector::init ( )

overridevirtual

init() is called after all C++ SimObjects have been created and all ports are connected.

Initializations that are independent of unserialization but rely on a fully instantiated and connected SimObject graph should be done here.

Reimplemented from gem5::SimObject.

Definition at line 393 of file statistical_corrector.cc.

References initBias(), makeThreadHistory(), and scHistory.

◆ initBias()

void gem5::branch_prediction::StatisticalCorrector::initBias ( )

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector.

Definition at line 105 of file statistical_corrector.cc.

References bias, biasBank, biasSK, gem5::ArmISA::j, and logBias.

Referenced by init().

◆ initGEHLTable()

void gem5::branch_prediction::StatisticalCorrector::initGEHLTable	(	unsigned	numLenghts,
		std::vector< int >	lengths,
		std::vector< int8_t > *&	table,
		unsigned	logNumEntries,
		std::vector< int8_t > &	w,
		int8_t	wInitValue
	)

Definition at line 134 of file statistical_corrector.cc.

References gem5::ArmISA::i, gem5::ArmISA::j, logSizeUps, and gem5::VegaISA::w.

Referenced by gem5::branch_prediction::MPP_StatisticalCorrector::MPP_StatisticalCorrector(), gem5::branch_prediction::MPP_StatisticalCorrector_64KB::MPP_StatisticalCorrector_64KB(), StatisticalCorrector(), gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector::TAGE_SC_L_64KB_StatisticalCorrector(), and gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector::TAGE_SC_L_8KB_StatisticalCorrector().

◆ makeBranchInfo()

StatisticalCorrector::BranchInfo * gem5::branch_prediction::StatisticalCorrector::makeBranchInfo ( )

virtual

Definition at line 93 of file statistical_corrector.cc.

◆ makeThreadHistory()

StatisticalCorrector::SCThreadHistory * gem5::branch_prediction::StatisticalCorrector::makeThreadHistory ( )

virtual

Reimplemented in gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector, gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector, gem5::branch_prediction::MPP_StatisticalCorrector_8KB, and gem5::branch_prediction::MPP_StatisticalCorrector_64KB.

Definition at line 99 of file statistical_corrector.cc.

Referenced by init().

◆ scHistoryUpdate()

void gem5::branch_prediction::StatisticalCorrector::scHistoryUpdate	(	Addr	branch_pc,
		const StaticInstPtr &	inst,
		bool	taken,
		BranchInfo *	tage_bi,
		Addr	corrTarget
	)

virtual

Reimplemented in gem5::branch_prediction::MPP_StatisticalCorrector_8KB, gem5::branch_prediction::MPP_StatisticalCorrector_64KB, gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector, and gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector.

Definition at line 295 of file statistical_corrector.cc.

References gem5::branch_prediction::StatisticalCorrector::SCThreadHistory::bwHist, im, gem5::branch_prediction::StatisticalCorrector::SCThreadHistory::imliCount, gem5::StaticInst::isDirectCtrl(), gem5::StaticInst::isUncondCtrl(), scHistory, and gem5::branch_prediction::StatisticalCorrector::SCThreadHistory::updateLocalHistory().

Referenced by gem5::branch_prediction::TAGE_SC_L_64KB_StatisticalCorrector::scHistoryUpdate(), gem5::branch_prediction::TAGE_SC_L_8KB_StatisticalCorrector::scHistoryUpdate(), gem5::branch_prediction::MPP_StatisticalCorrector_64KB::scHistoryUpdate(), gem5::branch_prediction::MPP_StatisticalCorrector_8KB::scHistoryUpdate(), gem5::branch_prediction::TAGE_SC_L::update(), and gem5::branch_prediction::MultiperspectivePerceptronTAGE::update().

◆ scPredict()

bool gem5::branch_prediction::StatisticalCorrector::scPredict	(	ThreadID	tid,
		Addr	branch_pc,
		bool	cond_branch,
		BranchInfo *	bi,
		bool	prev_pred_taken,
		bool	bias_bit,
		bool	use_conf_ctr,
		int8_t	conf_ctr,
		unsigned	conf_bits,
		int	hitBank,
		int	altBank,
		int64_t	phist,
		int	init_lsum = `0`
	)