#include <multiperspective_perceptron_64KB.hh>

Inheritance diagram for gem5::branch_prediction::MultiperspectivePerceptron64KB:

Public Member Functions
	MultiperspectivePerceptron64KB (const MultiperspectivePerceptron64KBParams &p)

Public Member Functions inherited from gem5::branch_prediction::MultiperspectivePerceptron
	MultiperspectivePerceptron (const MultiperspectivePerceptronParams &params)

void	setExtraBits (int bits)
	Sets the starting number of storage bits to compute the number of table entries.

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

bool	lookup (ThreadID tid, Addr branch_addr, void *&bp_history) override
	Looks up a given conditional branch PC of in the BP to see if it is taken or not taken.

void	updateHistories (ThreadID tid, Addr pc, bool uncond, bool taken, Addr target, void *&bp_history) override
	Ones done with the prediction this function updates the path and global history.

void	update (ThreadID tid, Addr pc, bool taken, void *&bp_history, bool squashed, const StaticInstPtr &inst, Addr target) override
	Updates the BP with taken/not taken information.

void	squash (ThreadID tid, void *&bp_history) override

Public Member Functions inherited from gem5::branch_prediction::BPredUnit
	BPredUnit (const Params &p)
	Branch Predictor Unit (BPU) interface functions.

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

void	drainSanityCheck () const
	Perform sanity checks after a drain.

bool	predict (const StaticInstPtr &inst, const InstSeqNum &seqNum, PCStateBase &pc, ThreadID tid)
	Predicts whether or not the instruction is a taken branch, and the target of the branch if it is taken.

void	update (const InstSeqNum &done_sn, ThreadID tid)
	Tells the branch predictor to commit any updates until the given sequence number.

void	squash (const InstSeqNum &squashed_sn, ThreadID tid)
	Squashes all outstanding updates until a given sequence number.

void	squash (const InstSeqNum &squashed_sn, const PCStateBase &corr_target, bool actually_taken, ThreadID tid, bool from_commit=true)
	Squashes all outstanding updates until a given sequence number, and corrects that sn's update with the proper address and taken/not taken.

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	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

Private Member Functions
void	createSpecs () override
	Creates the tables of the predictor.

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::branch_prediction::MultiperspectivePerceptron
void	insertModhistSpec (int p1, int p2)
	Auxiliary function for MODHIST and GHISTMODPATH features.

void	insertModpathSpec (int p1, int p2)
	Auxiliary function for MODPATH and GHISTMODPATH features.

int	insert (std::vector< int > &v, int x)
	Auxiliary function used by insertModhistSpec and insertModpathSpec.

void	computeBits (int num_filter_entries, int nlocal_histories, int local_history_length, bool ignore_path_size)
	Computes the size in bits of the structures needed to keep track of the history and the predictor tables and assigns the sizes of those tables that did not had their size specified.

unsigned int	getIndex (ThreadID tid, const MPPBranchInfo &bi, const HistorySpec &spec, int index) const
	Get the position index of a predictor table.

void	findBest (ThreadID tid, std::vector< int > &best_preds) const
	Finds the best subset of features to use in case of a low-confidence branch, returns the result as an ordered vector of the indices to the predictor tables.

int	computeOutput (ThreadID tid, MPPBranchInfo &bi)
	Computes the output of the predictor for a given branch and the resulting best value in case the prediction has low confidence.

void	train (ThreadID tid, MPPBranchInfo &bi, bool taken)
	Trains the branch predictor with the given branch and direction.

void	satIncDec (bool taken, bool &sign, int &c, int max_weight) const
	Auxiliary function to increase a table counter depending on the direction of the branch.

void	addSpec (HistorySpec *spec)
	Add a table spec to the prefetcher.

Protected Member Functions inherited from gem5::branch_prediction::BPredUnit
bool	BTBValid (ThreadID tid, Addr instPC)
	Looks up a given PC in the BTB to see if a matching entry exists.

const PCStateBase *	BTBLookup (ThreadID tid, PCStateBase &instPC)
	Looks up a given PC in the BTB to get the predicted target.

const StaticInstPtr	BTBGetInst (ThreadID tid, Addr instPC)
	Looks up a given PC in the BTB to get current static instruction information.

void	BTBUpdate (ThreadID tid, Addr instPC, const PCStateBase &target)
	Updates the BTB with the target of a branch.

void	dump ()

probing::PMUUPtr	pmuProbePoint (const char *name)
	Helper method to instantiate probe points belonging to this object.

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.

Protected Attributes inherited from gem5::branch_prediction::MultiperspectivePerceptron
const int	blockSize
	Predictor parameters.

const int	pcshift

const int	threshold

const int	bias0

const int	bias1

const int	biasmostly0

const int	biasmostly1

const int	nbest

const int	tunebits

const int	hshift

const unsigned long long int	imli_mask1

const unsigned long long int	imli_mask4

const unsigned long long int	recencypos_mask

const double	fudge

const int	n_sign_bits

const int	pcbit

const int	decay

const unsigned int	record_mask

const bool	hash_taken

const bool	tuneonly

const int	extra_rounds

const int	speed

const int	budgetbits

const bool	speculative_update

std::vector< ThreadData * >	threadData

std::vector< HistorySpec * >	specs
	Predictor tables.

std::vector< int >	table_sizes

bool	doing_local
	runtime values and data used to count the size in bits

bool	doing_recency

int	assoc

int	ghist_length

int	modghist_length

int	path_length

int	thresholdCounter

int	theta

int	extrabits

std::vector< int >	imli_counter_bits

std::vector< int >	modhist_indices

std::vector< int >	modhist_lengths

std::vector< int >	modpath_indices

std::vector< int >	modpath_lengths

std::vector< std::vector< int > >	blurrypath_bits

std::vector< std::vector< std::vector< bool > > >	acyclic_bits

Protected Attributes inherited from gem5::branch_prediction::BPredUnit
const unsigned	numThreads
	Number of the threads for which the branch history is maintained.

const bool	requiresBTBHit
	Requires the BTB to hit for returns and indirect branches.

const unsigned	instShiftAmt
	Number of bits to shift instructions by for predictor addresses.

std::vector< History >	predHist
	The per-thread predictor history.

BranchTargetBuffer *	btb
	The BTB.

ReturnAddrStack *	ras
	The return address stack.

IndirectPredictor *	iPred
	The indirect target predictor.

gem5::branch_prediction::BPredUnit::BPredUnitStats	stats

probing::PMUUPtr	ppBranches
	Branches seen by the branch predictor.

probing::PMUUPtr	ppMisses
	Miss-predicted branches.

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.

Static Protected Attributes inherited from gem5::branch_prediction::MultiperspectivePerceptron
static int	xlat []
	Transfer function for 6-width tables.

static int	xlat4 []
	Transfer function for 5-width tables.