#include <loop_predictor.hh>

Inheritance diagram for gem5::branch_prediction::LoopPredictor:

Classes
struct	BranchInfo

struct	LoopEntry

struct	LoopPredictorStats

Public Member Functions
int	lindex (Addr pc_in, unsigned instShiftAmt) const
	Computes the index used to access the loop predictor.

int	finallindex (int lindex, int lowPcBits, int way) const
	Computes the index used to access the ltable structures.

bool	getLoop (Addr pc, BranchInfo *bi, bool speculative, unsigned instShiftAmt) const
	Get a branch prediction from the loop predictor.

void	loopUpdate (Addr pc, bool Taken, BranchInfo *bi, bool tage_pred)
	Updates the loop predictor.

void	specLoopUpdate (bool taken, BranchInfo *bi)
	Speculatively updates the loop predictor iteration count (only for useSpeculation).

void	condBranchUpdate (ThreadID tid, Addr branch_pc, bool taken, bool tage_pred, BranchInfo *bi, unsigned instShiftAmt)
	Update LTAGE for conditional branches.

bool	loopPredict (ThreadID tid, Addr branch_pc, bool cond_branch, BranchInfo *bi, bool prev_pred_taken, unsigned instShiftAmt)
	Get the loop prediction.

void	updateStats (bool taken, BranchInfo *bi)
	Update the stats.

void	squashLoop (BranchInfo *bi)

void	squash (ThreadID tid, BranchInfo *bi)

virtual bool	calcConf (int index) const

virtual bool	optionalAgeInc () const

virtual BranchInfo *	makeBranchInfo ()

int8_t	getLoopUseCounter () const
	Gets the value of the loop use counter.

void	init () override
	Initialize the loop predictor.

	LoopPredictor (const LoopPredictorParams &p)

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.

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

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

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

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

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

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

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

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

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

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

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

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.

void	setCurTick (Tick newVal)

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

	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.

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

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

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.

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

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

virtual	~Group ()

virtual void	regStats ()
	Callback to set stat parameters.

virtual void	resetStats ()
	Callback to reset stats.

virtual void	preDumpStats ()
	Callback before stats are dumped.

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

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

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

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

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

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

	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

Static Protected Member Functions
static void	unsignedCtrUpdate (uint8_t &ctr, bool up, unsigned nbits)
	Updates an unsigned counter based on up/down parameter.

static void	signedCtrUpdate (int8_t &ctr, bool up, unsigned nbits)

Protected Attributes
const unsigned	logSizeLoopPred

const unsigned	loopTableAgeBits

const unsigned	loopTableConfidenceBits

const unsigned	loopTableTagBits

const unsigned	loopTableIterBits

const unsigned	logLoopTableAssoc

const uint8_t	confidenceThreshold

const uint16_t	loopTagMask

const uint16_t	loopNumIterMask

const int	loopSetMask

LoopEntry *	ltable

int8_t	loopUseCounter

unsigned	withLoopBits

const bool	useDirectionBit

const bool	useSpeculation

const bool	useHashing

const bool	restrictAllocation

const unsigned	initialLoopIter

const unsigned	initialLoopAge

const bool	optionalAgeReset

gem5::branch_prediction::LoopPredictor::LoopPredictorStats	stats

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

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

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.

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

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

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

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

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

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

virtual	~Drainable ()

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

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

Detailed Description

Definition at line 59 of file loop_predictor.hh.

Constructor & Destructor Documentation

◆ LoopPredictor()

gem5::branch_prediction::LoopPredictor::LoopPredictor ( const LoopPredictorParams & p )

Definition at line 59 of file loop_predictor.cc.

References initialLoopAge, and loopTableAgeBits.

Member Function Documentation

◆ calcConf()

bool gem5::branch_prediction::LoopPredictor::calcConf ( int index ) const

virtual

Reimplemented in gem5::branch_prediction::MPP_LoopPredictor, and gem5::branch_prediction::TAGE_SC_L_LoopPredictor.

Definition at line 168 of file loop_predictor.cc.

References gem5::branch_prediction::LoopPredictor::LoopEntry::confidence, confidenceThreshold, gem5::MipsISA::index, and ltable.

Referenced by gem5::branch_prediction::MPP_LoopPredictor::calcConf(), gem5::branch_prediction::TAGE_SC_L_LoopPredictor::calcConf(), and getLoop().

◆ condBranchUpdate()

void gem5::branch_prediction::LoopPredictor::condBranchUpdate	(	ThreadID	tid,
		Addr	branch_pc,
		bool	taken,
		bool	tage_pred,
		BranchInfo *	bi,
		unsigned	instShiftAmt )

Update LTAGE for conditional branches.

Parameters

branch_pc	The unshifted branch PC.
taken	Actual branch outcome.
tage_pred	Prediction from TAGE
bi	Pointer to information on the prediction recorded at prediction time.
instShiftAmt	Number of bits to shift instructions

Definition at line 346 of file loop_predictor.cc.

References gem5::PowerISA::bi, getLoop(), loopUpdate(), loopUseCounter, signedCtrUpdate(), useSpeculation, and withLoopBits.

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

◆ finallindex()

int gem5::branch_prediction::LoopPredictor::finallindex	(	int	lindex,
		int	lowPcBits,
		int	way ) const

Computes the index used to access the ltable structures.

It may take hashing into account

Parameters

index	Result of lindex function
lowPcBits	PC bits masked with set size
way	Way to be used

Definition at line 121 of file loop_predictor.cc.

References gem5::MipsISA::index, logLoopTableAssoc, and useHashing.

Referenced by getLoop(), loopUpdate(), specLoopUpdate(), squash(), and squashLoop().

◆ getLoop()

bool gem5::branch_prediction::LoopPredictor::getLoop	(	Addr	pc,
		BranchInfo *	bi,
		bool	speculative,
		unsigned	instShiftAmt ) const

Get a branch prediction from the loop predictor.

Parameters

pc	The unshifted branch PC.
bi	Pointer to information on the prediction.
speculative	Use speculative number of iterations
instShiftAmt	Shift the pc by as many bits (if hashing is not used)

Returns: the result of the prediction, if it could be predicted

Definition at line 130 of file loop_predictor.cc.

References gem5::PowerISA::bi, calcConf(), gem5::branch_prediction::LoopPredictor::LoopEntry::currentIter, gem5::branch_prediction::LoopPredictor::LoopEntry::currentIterSpec, gem5::branch_prediction::LoopPredictor::LoopEntry::dir, finallindex(), gem5::ArmISA::i, lindex(), logLoopTableAssoc, logSizeLoopPred, loopSetMask, loopTableTagBits, loopTagMask, ltable, gem5::MipsISA::pc, useDirectionBit, and useHashing.

Referenced by condBranchUpdate(), and loopPredict().

◆ getLoopUseCounter()

int8_t gem5::branch_prediction::LoopPredictor::getLoopUseCounter ( ) const

inline

Gets the value of the loop use counter.

Returns: the loop use counter value

Definition at line 263 of file loop_predictor.hh.

References loopUseCounter.

Referenced by gem5::branch_prediction::LTAGE::predict().

◆ getSizeInBits()

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

Definition at line 384 of file loop_predictor.cc.

References logSizeLoopPred, loopTableAgeBits, loopTableConfidenceBits, loopTableIterBits, loopTableTagBits, useDirectionBit, and useSpeculation.

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

◆ init()

void gem5::branch_prediction::LoopPredictor::init ( )

overridevirtual

Initialize the loop predictor.

Reimplemented from gem5::SimObject.

Definition at line 85 of file loop_predictor.cc.

References logLoopTableAssoc, logSizeLoopPred, loopTableIterBits, loopTableTagBits, and ltable.

◆ lindex()

int gem5::branch_prediction::LoopPredictor::lindex	(	Addr	pc_in,
		unsigned	instShiftAmt ) const

Computes the index used to access the loop predictor.

Parameters

pc_in	The unshifted branch PC.
instShiftAmt	Shift the pc by as many bits

Definition at line 104 of file loop_predictor.cc.

References logLoopTableAssoc, loopSetMask, gem5::MipsISA::pc, and useHashing.

Referenced by getLoop().

◆ loopPredict()

bool gem5::branch_prediction::LoopPredictor::loopPredict	(	ThreadID	tid,
		Addr	branch_pc,
		bool	cond_branch,
		BranchInfo *	bi,
		bool	prev_pred_taken,
		unsigned	instShiftAmt )

Get the loop prediction.

Parameters

tid	The thread ID to select the global histories to use.
branch_pc	The unshifted branch PC.
cond_branch	True if the branch is conditional.
bi	Reference to wrapping pointer to allow storing derived class prediction information in the base class.
prev_pred_taken	Result of the TAGE prediction
instShiftAmt	Shift the pc by as many bits
instShiftAmt	Shift the pc by as many bits

Returns: the prediction, true if taken

Definition at line 289 of file loop_predictor.cc.

References gem5::PowerISA::bi, getLoop(), loopUseCounter, specLoopUpdate(), and useSpeculation.

Referenced by gem5::branch_prediction::MultiperspectivePerceptronTAGE::lookup(), gem5::branch_prediction::LTAGE::predict(), and gem5::branch_prediction::TAGE_SC_L::predict().

◆ loopUpdate()

void gem5::branch_prediction::LoopPredictor::loopUpdate	(	Addr	pc,
		bool	Taken,
		BranchInfo *	bi,
		bool	tage_pred )

Updates the loop predictor.

Parameters

pc	The unshifted branch PC.
taken	The actual branch outcome.
bi	Pointer to information on the prediction recorded at prediction time.
tage_pred	tage prediction of the branch

Definition at line 194 of file loop_predictor.cc.

References gem5::branch_prediction::LoopPredictor::LoopEntry::age, gem5::PowerISA::bi, gem5::branch_prediction::LoopPredictor::LoopEntry::confidence, gem5::branch_prediction::LoopPredictor::LoopEntry::currentIter, gem5::branch_prediction::LoopPredictor::LoopEntry::dir, DPRINTF, finallindex(), gem5::ArmISA::i, initialLoopAge, initialLoopIter, logLoopTableAssoc, loopNumIterMask, loopTableAgeBits, loopTableConfidenceBits, ltable, gem5::branch_prediction::LoopPredictor::LoopEntry::numIter, optionalAgeInc(), optionalAgeReset, gem5::MipsISA::pc, gem5::Random::random(), gem5::random_mt, restrictAllocation, gem5::branch_prediction::LoopPredictor::LoopEntry::tag, unsignedCtrUpdate(), and useDirectionBit.

Referenced by condBranchUpdate().

◆ makeBranchInfo()

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

virtual

Definition at line 98 of file loop_predictor.cc.

◆ optionalAgeInc()

bool gem5::branch_prediction::LoopPredictor::optionalAgeInc ( ) const

virtual

Reimplemented in gem5::branch_prediction::MPP_LoopPredictor, and gem5::branch_prediction::TAGE_SC_L_LoopPredictor.

Definition at line 188 of file loop_predictor.cc.

Referenced by loopUpdate().

◆ signedCtrUpdate()

static void gem5::branch_prediction::LoopPredictor::signedCtrUpdate	(	int8_t &	ctr,
		bool	up,
		unsigned	nbits )

inlinestaticprotected

Definition at line 128 of file loop_predictor.hh.

References gem5::ArmISA::up.

Referenced by condBranchUpdate().

◆ specLoopUpdate()

void gem5::branch_prediction::LoopPredictor::specLoopUpdate	(	bool	taken,
		BranchInfo *	bi )

Speculatively updates the loop predictor iteration count (only for useSpeculation).

Parameters

taken	The predicted branch outcome.
bi	Pointer to information on the prediction recorded at prediction time.

Definition at line 174 of file loop_predictor.cc.

References gem5::PowerISA::bi, gem5::branch_prediction::LoopPredictor::LoopEntry::currentIterSpec, finallindex(), gem5::MipsISA::index, loopNumIterMask, and ltable.

Referenced by loopPredict().

◆ squash()

void gem5::branch_prediction::LoopPredictor::squash	(	ThreadID	tid,
		BranchInfo *	bi )

Definition at line 311 of file loop_predictor.cc.

References gem5::PowerISA::bi, gem5::branch_prediction::LoopPredictor::LoopEntry::currentIterSpec, finallindex(), and ltable.

Referenced by gem5::branch_prediction::LTAGE::squash().

◆ squashLoop()

void gem5::branch_prediction::LoopPredictor::squashLoop ( BranchInfo * bi )

Definition at line 322 of file loop_predictor.cc.

References gem5::PowerISA::bi, gem5::branch_prediction::LoopPredictor::LoopEntry::currentIterSpec, finallindex(), and ltable.

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

◆ unsignedCtrUpdate()

static void gem5::branch_prediction::LoopPredictor::unsignedCtrUpdate	(	uint8_t &	ctr,
		bool	up,
		unsigned	nbits )

inlinestaticprotected

Updates an unsigned counter based on up/down parameter.

Parameters

ctr	Reference to counter to update.
up	Boolean indicating if the counter is incremented/decremented If true it is incremented, if false it is decremented
nbits	Counter width.

Definition at line 117 of file loop_predictor.hh.

References gem5::ArmISA::up.

Referenced by loopUpdate().

◆ updateStats()

void gem5::branch_prediction::LoopPredictor::updateStats	(	bool	taken,
		BranchInfo *	bi )

Update the stats.

Parameters

taken	Actual branch outcome
bi	Pointer to information on the prediction recorded at prediction time.

Definition at line 333 of file loop_predictor.cc.

References gem5::PowerISA::bi, gem5::branch_prediction::LoopPredictor::LoopPredictorStats::correct, stats, gem5::branch_prediction::LoopPredictor::LoopPredictorStats::used, and gem5::branch_prediction::LoopPredictor::LoopPredictorStats::wrong.

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

Member Data Documentation

◆ confidenceThreshold

const uint8_t gem5::branch_prediction::LoopPredictor::confidenceThreshold

protected

Definition at line 68 of file loop_predictor.hh.

Referenced by calcConf().

◆ initialLoopAge

const unsigned gem5::branch_prediction::LoopPredictor::initialLoopAge

protected

Definition at line 99 of file loop_predictor.hh.

Referenced by LoopPredictor(), and loopUpdate().

◆ initialLoopIter

const unsigned gem5::branch_prediction::LoopPredictor::initialLoopIter

protected

Definition at line 98 of file loop_predictor.hh.

Referenced by loopUpdate().

◆ logLoopTableAssoc

const unsigned gem5::branch_prediction::LoopPredictor::logLoopTableAssoc

protected

Definition at line 67 of file loop_predictor.hh.

Referenced by finallindex(), getLoop(), init(), lindex(), and loopUpdate().

◆ logSizeLoopPred

const unsigned gem5::branch_prediction::LoopPredictor::logSizeLoopPred

protected

Definition at line 62 of file loop_predictor.hh.

Referenced by getLoop(), getSizeInBits(), and init().

◆ loopNumIterMask

const uint16_t gem5::branch_prediction::LoopPredictor::loopNumIterMask

protected

Definition at line 70 of file loop_predictor.hh.

Referenced by loopUpdate(), and specLoopUpdate().

◆ loopSetMask

const int gem5::branch_prediction::LoopPredictor::loopSetMask

protected

Definition at line 71 of file loop_predictor.hh.

Referenced by getLoop(), and lindex().

◆ loopTableAgeBits

const unsigned gem5::branch_prediction::LoopPredictor::loopTableAgeBits

protected

Definition at line 63 of file loop_predictor.hh.

Referenced by getSizeInBits(), LoopPredictor(), and loopUpdate().

◆ loopTableConfidenceBits

const unsigned gem5::branch_prediction::LoopPredictor::loopTableConfidenceBits

protected

Definition at line 64 of file loop_predictor.hh.

Referenced by getSizeInBits(), and loopUpdate().

◆ loopTableIterBits

const unsigned gem5::branch_prediction::LoopPredictor::loopTableIterBits

protected

Definition at line 66 of file loop_predictor.hh.

Referenced by getSizeInBits(), and init().

◆ loopTableTagBits

const unsigned gem5::branch_prediction::LoopPredictor::loopTableTagBits

protected

Definition at line 65 of file loop_predictor.hh.

Referenced by getLoop(), getSizeInBits(), and init().

◆ loopTagMask

const uint16_t gem5::branch_prediction::LoopPredictor::loopTagMask

protected

Definition at line 69 of file loop_predictor.hh.

Referenced by getLoop().

◆ loopUseCounter

int8_t gem5::branch_prediction::LoopPredictor::loopUseCounter

protected

Definition at line 91 of file loop_predictor.hh.

Referenced by condBranchUpdate(), getLoopUseCounter(), and loopPredict().

◆ ltable

LoopEntry* gem5::branch_prediction::LoopPredictor::ltable

protected

Definition at line 89 of file loop_predictor.hh.

Referenced by calcConf(), gem5::branch_prediction::MPP_LoopPredictor::calcConf(), gem5::branch_prediction::TAGE_SC_L_LoopPredictor::calcConf(), getLoop(), init(), loopUpdate(), specLoopUpdate(), squash(), and squashLoop().

◆ optionalAgeReset

const bool gem5::branch_prediction::LoopPredictor::optionalAgeReset

protected

Definition at line 100 of file loop_predictor.hh.

Referenced by loopUpdate().

◆ restrictAllocation

const bool gem5::branch_prediction::LoopPredictor::restrictAllocation

protected

Definition at line 97 of file loop_predictor.hh.

Referenced by loopUpdate().

◆ stats

gem5::branch_prediction::LoopPredictor::LoopPredictorStats gem5::branch_prediction::LoopPredictor::stats

protected

Referenced by updateStats().

◆ useDirectionBit

const bool gem5::branch_prediction::LoopPredictor::useDirectionBit

protected

Definition at line 94 of file loop_predictor.hh.

Referenced by getLoop(), getSizeInBits(), and loopUpdate().

◆ useHashing

const bool gem5::branch_prediction::LoopPredictor::useHashing

protected

Definition at line 96 of file loop_predictor.hh.

Referenced by finallindex(), getLoop(), and lindex().

◆ useSpeculation

const bool gem5::branch_prediction::LoopPredictor::useSpeculation

protected

Definition at line 95 of file loop_predictor.hh.

Referenced by condBranchUpdate(), getSizeInBits(), and loopPredict().

◆ withLoopBits

unsigned gem5::branch_prediction::LoopPredictor::withLoopBits

protected

Definition at line 92 of file loop_predictor.hh.

Referenced by condBranchUpdate().

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

cpu/pred/loop_predictor.hh
cpu/pred/loop_predictor.cc

Classes

Public Member Functions

Static Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ LoopPredictor()

Member Function Documentation

◆ calcConf()

◆ condBranchUpdate()

◆ finallindex()

◆ getLoop()

◆ getLoopUseCounter()

◆ getSizeInBits()

◆ init()

◆ lindex()

◆ loopPredict()

◆ loopUpdate()

◆ makeBranchInfo()

◆ optionalAgeInc()

◆ signedCtrUpdate()

◆ specLoopUpdate()

◆ squash()

◆ squashLoop()

◆ unsignedCtrUpdate()

◆ updateStats()

Member Data Documentation

◆ confidenceThreshold

◆ initialLoopAge

◆ initialLoopIter

◆ logLoopTableAssoc

◆ logSizeLoopPred

◆ loopNumIterMask

◆ loopSetMask

◆ loopTableAgeBits

◆ loopTableConfidenceBits

◆ loopTableIterBits

◆ loopTableTagBits

◆ loopTagMask

◆ loopUseCounter

◆ ltable

◆ optionalAgeReset

◆ restrictAllocation

◆ stats

◆ useDirectionBit

◆ useHashing

◆ useSpeculation

◆ withLoopBits