gem5  v21.1.0.2
Classes | Public Member Functions | Protected Member Functions | Protected Attributes | Static Protected Attributes | List of all members
gem5::branch_prediction::MultiperspectivePerceptron Class Referenceabstract

#include <multiperspective_perceptron.hh>

Inheritance diagram for gem5::branch_prediction::MultiperspectivePerceptron:
gem5::branch_prediction::BPredUnit gem5::SimObject gem5::EventManager gem5::Serializable gem5::Drainable gem5::statistics::Group gem5::Named gem5::branch_prediction::MultiperspectivePerceptron64KB gem5::branch_prediction::MultiperspectivePerceptron8KB gem5::branch_prediction::MultiperspectivePerceptronTAGE gem5::branch_prediction::MultiperspectivePerceptronTAGE64KB gem5::branch_prediction::MultiperspectivePerceptronTAGE8KB

Classes

class  ACYCLIC
 
class  BIAS
 
class  BLURRYPATH
 
struct  FilterEntry
 Entry of the branch filter. More...
 
class  GHIST
 Available features. More...
 
class  GHISTMODPATH
 
class  GHISTPATH
 
struct  HistorySpec
 Base class to implement the predictor tables. More...
 
class  IMLI
 
class  LOCAL
 
class  LocalHistories
 Local history entries, each enty contains the history of directions taken by a given branch. More...
 
class  MODHIST
 
class  MODPATH
 
class  MPPBranchInfo
 Branch information data. More...
 
class  PATH
 
class  RECENCY
 
class  RECENCYPOS
 
class  SGHISTPATH
 
struct  ThreadData
 History data is kept for each thread. More...
 

Public Member Functions

 MultiperspectivePerceptron (const MultiperspectivePerceptronParams &params)
 
void setExtraBits (int bits)
 Sets the starting number of storage bits to compute the number of table entries. More...
 
void init () override
 init() is called after all C++ SimObjects have been created and all ports are connected. More...
 
void uncondBranch (ThreadID tid, Addr pc, void *&bp_history) override
 
void squash (ThreadID tid, void *bp_history) override
 
bool lookup (ThreadID tid, Addr instPC, void *&bp_history) override
 Looks up a given PC in the BP to see if it is taken or not taken. More...
 
void update (ThreadID tid, Addr instPC, bool taken, void *bp_history, bool squashed, const StaticInstPtr &inst, Addr corrTarget) override
 Updates the BP with taken/not taken information. More...
 
void btbUpdate (ThreadID tid, Addr branch_addr, void *&bp_history) override
 If a branch is not taken, because the BTB address is invalid or missing, this function sets the appropriate counter in the global and local predictors to not taken. More...
 
- Public Member Functions inherited from gem5::branch_prediction::BPredUnit
 BPredUnit (const Params &p)
 
void regProbePoints () override
 Register probe points for this object. More...
 
void drainSanityCheck () const
 Perform sanity checks after a drain. More...
 
bool predict (const StaticInstPtr &inst, const InstSeqNum &seqNum, TheISA::PCState &pc, ThreadID tid)
 Predicts whether or not the instruction is a taken branch, and the target of the branch if it is taken. More...
 
void update (const InstSeqNum &done_sn, ThreadID tid)
 Tells the branch predictor to commit any updates until the given sequence number. More...
 
void squash (const InstSeqNum &squashed_sn, ThreadID tid)
 Squashes all outstanding updates until a given sequence number. More...
 
void squash (const InstSeqNum &squashed_sn, const TheISA::PCState &corr_target, bool actually_taken, ThreadID tid)
 Squashes all outstanding updates until a given sequence number, and corrects that sn's update with the proper address and taken/not taken. More...
 
bool BTBValid (Addr instPC)
 Looks up a given PC in the BTB to see if a matching entry exists. More...
 
TheISA::PCState BTBLookup (Addr instPC)
 Looks up a given PC in the BTB to get the predicted target. More...
 
void BTBUpdate (Addr instPC, const TheISA::PCState &target)
 Updates the BTB with the target of a branch. More...
 
void dump ()
 
- Public Member Functions inherited from gem5::SimObject
const Paramsparams () 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 regProbeListeners ()
 Register probe listeners for this object. More...
 
ProbeManagergetProbeManager ()
 Get the probe manager for this object. More...
 
virtual PortgetPort (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
EventQueueeventQueue () 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 InforesolveStat (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
 
Groupoperator= (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

void insertModhistSpec (int p1, int p2)
 Auxiliary function for MODHIST and GHISTMODPATH features. More...
 
void insertModpathSpec (int p1, int p2)
 Auxiliary function for MODPATH and GHISTMODPATH features. More...
 
int insert (std::vector< int > &v, int x)
 Auxiliary function used by insertModhistSpec and insertModpathSpec. More...
 
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. More...
 
virtual void createSpecs ()=0
 Creates the tables of the predictor. More...
 
unsigned int getIndex (ThreadID tid, const MPPBranchInfo &bi, const HistorySpec &spec, int index) const
 Get the position index of a predictor table. More...
 
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. More...
 
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. More...
 
void train (ThreadID tid, MPPBranchInfo &bi, bool taken)
 Trains the branch predictor with the given branch and direction. More...
 
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. More...
 
void addSpec (HistorySpec *spec)
 Add a table spec to the prefetcher. More...
 
- Protected Member Functions inherited from gem5::branch_prediction::BPredUnit
probing::PMUUPtr pmuProbePoint (const char *name)
 Helper method to instantiate probe points belonging to this object. More...
 
- 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

const int blockSize
 Predictor parameters. More...
 
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. More...
 
std::vector< int > table_sizes
 
bool doing_local
 runtime values and data used to count the size in bits More...
 
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 instShiftAmt
 Number of bits to shift instructions by for predictor addresses. More...
 
probing::PMUUPtr ppBranches
 Branches seen by the branch predictor. More...
 
probing::PMUUPtr ppMisses
 Miss-predicted branches. More...
 
- Protected Attributes inherited from gem5::SimObject
const SimObjectParams & _params
 Cached copy of the object parameters. More...
 
- Protected Attributes inherited from gem5::EventManager
EventQueueeventq
 A pointer to this object's event queue. More...
 

Static Protected Attributes

static int xlat []
 Transfer function for 6-width tables. More...
 
static int xlat4 []
 Transfer function for 5-width tables. More...
 

Additional Inherited Members

- Public Types inherited from gem5::branch_prediction::BPredUnit
typedef BranchPredictorParams Params
 
- 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 SimObjectfind (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 SimObjectResolvergetSimObjectResolver ()
 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 54 of file multiperspective_perceptron.hh.

Constructor & Destructor Documentation

◆ MultiperspectivePerceptron()

gem5::branch_prediction::MultiperspectivePerceptron::MultiperspectivePerceptron ( const MultiperspectivePerceptronParams &  params)

Definition at line 119 of file multiperspective_perceptron.cc.

References fatal_if, and speculative_update.

Member Function Documentation

◆ addSpec()

void gem5::branch_prediction::MultiperspectivePerceptron::addSpec ( HistorySpec spec)
inlineprotected

◆ btbUpdate()

void gem5::branch_prediction::MultiperspectivePerceptron::btbUpdate ( ThreadID  tid,
Addr  instPC,
void *&  bp_history 
)
overridevirtual

If a branch is not taken, because the BTB address is invalid or missing, this function sets the appropriate counter in the global and local predictors to not taken.

Parameters
inst_PCThe PC to look up the local predictor.
bp_historyPointer that will be set to an object that has the branch predictor state associated with the lookup.

Implements gem5::branch_prediction::BPredUnit.

Definition at line 819 of file multiperspective_perceptron.cc.

◆ computeBits()

void gem5::branch_prediction::MultiperspectivePerceptron::computeBits ( int  num_filter_entries,
int  nlocal_histories,
int  local_history_length,
bool  ignore_path_size 
)
protected

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.

Parameters
num_filter_entriesnumber of entries of the filter
nlocal_historiesnumber of local history entries
local_history_lengthsize of each local history entry
ignore_path_sizeignore the path length storage

Definition at line 178 of file multiperspective_perceptron.cc.

References acyclic_bits, assoc, blurrypath_bits, budgetbits, doing_local, doing_recency, DPRINTF, extrabits, ghist_length, gem5::ArmISA::i, imli_counter_bits, gem5::ArmISA::len, modhist_lengths, modpath_lengths, n_sign_bits, path_length, specs, table_sizes, threshold, and tunebits.

Referenced by init().

◆ computeOutput()

int gem5::branch_prediction::MultiperspectivePerceptron::computeOutput ( ThreadID  tid,
MPPBranchInfo bi 
)
protected

Computes the output of the predictor for a given branch and the resulting best value in case the prediction has low confidence.

Parameters
tidThread ID of the branch
bibranch informaiton data
Returns
resulting sum for low-confidence branch

Definition at line 310 of file multiperspective_perceptron.cc.

References gem5::PowerISA::bi, bias0, bias1, biasmostly0, biasmostly1, gem5::branch_prediction::MultiperspectivePerceptron::HistorySpec::coeff, findBest(), fudge, getIndex(), gem5::ArmISA::i, gem5::ArmISA::j, n_sign_bits, nbest, specs, threadData, threshold, gem5::X86ISA::val, gem5::branch_prediction::MultiperspectivePerceptron::HistorySpec::width, xlat, and xlat4.

Referenced by lookup().

◆ createSpecs()

virtual void gem5::branch_prediction::MultiperspectivePerceptron::createSpecs ( )
protectedpure virtual

◆ findBest()

void gem5::branch_prediction::MultiperspectivePerceptron::findBest ( ThreadID  tid,
std::vector< int > &  best_preds 
) const
protected

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.

Parameters
tidThread ID of the branch
vectorto write the ordered list of indices of the best tables

Definition at line 252 of file multiperspective_perceptron.cc.

References gem5::ArmISA::i, gem5::MipsISA::index, nbest, gem5::operator<(), threadData, and threshold.

Referenced by computeOutput().

◆ getIndex()

unsigned int gem5::branch_prediction::MultiperspectivePerceptron::getIndex ( ThreadID  tid,
const MPPBranchInfo bi,
const HistorySpec spec,
int  index 
) const
protected

Get the position index of a predictor table.

Parameters
tidThread ID of the branch
bibranch informaiton data
specpredictor table
indexinteger index of the predictor table
Returns
index to access the predictor table

Definition at line 279 of file multiperspective_perceptron.cc.

References gem5::PowerISA::bi, doing_recency, gem5::MipsISA::g, gem5::branch_prediction::MultiperspectivePerceptron::HistorySpec::getHash(), gem5::branch_prediction::MultiperspectivePerceptron::RECENCYPOS::hash(), hshift, imli_mask1, imli_mask4, gem5::MipsISA::index, recencypos_mask, table_sizes, and threadData.

Referenced by computeOutput(), and train().

◆ init()

void gem5::branch_prediction::MultiperspectivePerceptron::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.

Reimplemented in gem5::branch_prediction::MultiperspectivePerceptronTAGE.

Definition at line 146 of file multiperspective_perceptron.cc.

References acyclic_bits, assoc, blockSize, blurrypath_bits, computeBits(), createSpecs(), ghist_length, gem5::ArmISA::i, modhist_indices, modhist_lengths, modpath_indices, modpath_lengths, n_sign_bits, gem5::MipsISA::p, gem5::SimObject::params(), path_length, specs, table_sizes, and threadData.

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

◆ insert()

int gem5::branch_prediction::MultiperspectivePerceptron::insert ( std::vector< int > &  v,
int  x 
)
inlineprotected

Auxiliary function used by insertModhistSpec and insertModpathSpec.

Definition at line 412 of file multiperspective_perceptron.hh.

References gem5::ArmISA::i, gem5::ArmISA::v, and gem5::RiscvISA::x.

Referenced by insertModhistSpec(), and insertModpathSpec().

◆ insertModhistSpec()

void gem5::branch_prediction::MultiperspectivePerceptron::insertModhistSpec ( int  p1,
int  p2 
)
inlineprotected

◆ insertModpathSpec()

void gem5::branch_prediction::MultiperspectivePerceptron::insertModpathSpec ( int  p1,
int  p2 
)
inlineprotected

◆ lookup()

bool gem5::branch_prediction::MultiperspectivePerceptron::lookup ( ThreadID  tid,
Addr  instPC,
void *&  bp_history 
)
overridevirtual

Looks up a given PC in the BP to see if it is taken or not taken.

Parameters
inst_PCThe PC to look up.
bp_historyPointer that will be set to an object that has the branch predictor state associated with the lookup.
Returns
Whether the branch is taken or not taken.

Implements gem5::branch_prediction::BPredUnit.

Reimplemented in gem5::branch_prediction::MultiperspectivePerceptronTAGE.

Definition at line 574 of file multiperspective_perceptron.cc.

References gem5::PowerISA::bi, computeOutput(), gem5::ArmISA::f, pcshift, threadData, and threshold.

◆ satIncDec()

void gem5::branch_prediction::MultiperspectivePerceptron::satIncDec ( bool  taken,
bool &  sign,
int &  c,
int  max_weight 
) const
protected

Auxiliary function to increase a table counter depending on the direction of the branch.

Parameters
takenwhether the branch was taken
signcurrent sign of the table
ccurrent value of the table
max_weightmaximum value of the counter

Definition at line 373 of file multiperspective_perceptron.cc.

Referenced by train().

◆ setExtraBits()

void gem5::branch_prediction::MultiperspectivePerceptron::setExtraBits ( int  bits)

Sets the starting number of storage bits to compute the number of table entries.

Parameters
bitsnumber of bits used

Definition at line 140 of file multiperspective_perceptron.cc.

References gem5::bits(), and extrabits.

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

◆ squash()

void gem5::branch_prediction::MultiperspectivePerceptron::squash ( ThreadID  tid,
void *  bp_history 
)
overridevirtual
Parameters
bp_historyPointer to the history object. The predictor will need to update any state and delete the object.

Implements gem5::branch_prediction::BPredUnit.

Reimplemented in gem5::branch_prediction::MultiperspectivePerceptronTAGE.

Definition at line 825 of file multiperspective_perceptron.cc.

References gem5::PowerISA::bi.

◆ train()

void gem5::branch_prediction::MultiperspectivePerceptron::train ( ThreadID  tid,
MPPBranchInfo bi,
bool  taken 
)
protected

Trains the branch predictor with the given branch and direction.

Parameters
tidThread ID of the branch
bibranch informaiton data
takenwhether the branch was taken

Definition at line 410 of file multiperspective_perceptron.cc.

References gem5::PowerISA::bi, gem5::branch_prediction::MultiperspectivePerceptron::HistorySpec::coeff, extra_rounds, getIndex(), gem5::ArmISA::i, gem5::ArmISA::j, n_sign_bits, gem5::Random::random(), gem5::random_mt, satIncDec(), specs, speed, theta, threadData, threshold, thresholdCounter, tunebits, tuneonly, gem5::branch_prediction::MultiperspectivePerceptron::HistorySpec::width, xlat, and xlat4.

Referenced by update().

◆ uncondBranch()

void gem5::branch_prediction::MultiperspectivePerceptron::uncondBranch ( ThreadID  tid,
Addr  pc,
void *&  bp_history 
)
overridevirtual

◆ update()

void gem5::branch_prediction::MultiperspectivePerceptron::update ( ThreadID  tid,
Addr  instPC,
bool  taken,
void *  bp_history,
bool  squashed,
const StaticInstPtr inst,
Addr  corrTarget 
)
overridevirtual

Updates the BP with taken/not taken information.

Parameters
inst_PCThe branch's PC that will be updated.
takenWhether the branch was taken or not taken.
bp_historyPointer to the branch predictor state that is associated with the branch lookup that is being updated.
squashedSet to true when this function is called during a squash operation.
instStatic instruction information
corrTargetThe resolved target of the branch (only needed for squashed branches)
Todo:
Make this update flexible enough to handle a global predictor.

Implements gem5::branch_prediction::BPredUnit.

Reimplemented in gem5::branch_prediction::MultiperspectivePerceptronTAGE.

Definition at line 616 of file multiperspective_perceptron.cc.

References gem5::ArmISA::a, assoc, gem5::PowerISA::bi, blockSize, decay, doing_recency, gem5::ArmISA::f, ghist_length, hash_taken, gem5::ArmISA::i, gem5::ArmISA::j, modhist_indices, modhist_lengths, modpath_indices, modpath_lengths, path_length, pcbit, gem5::Random::random(), gem5::random_mt, record_mask, gem5::branch_prediction::MultiperspectivePerceptron::FilterEntry::seenTaken, gem5::branch_prediction::MultiperspectivePerceptron::FilterEntry::seenUntaken, threadData, train(), and gem5::ArmISA::z.

Member Data Documentation

◆ acyclic_bits

std::vector<std::vector<std::vector<bool> > > gem5::branch_prediction::MultiperspectivePerceptron::acyclic_bits
protected

◆ assoc

int gem5::branch_prediction::MultiperspectivePerceptron::assoc
protected

◆ bias0

const int gem5::branch_prediction::MultiperspectivePerceptron::bias0
protected

Definition at line 270 of file multiperspective_perceptron.hh.

Referenced by computeOutput().

◆ bias1

const int gem5::branch_prediction::MultiperspectivePerceptron::bias1
protected

Definition at line 271 of file multiperspective_perceptron.hh.

Referenced by computeOutput().

◆ biasmostly0

const int gem5::branch_prediction::MultiperspectivePerceptron::biasmostly0
protected

Definition at line 272 of file multiperspective_perceptron.hh.

Referenced by computeOutput().

◆ biasmostly1

const int gem5::branch_prediction::MultiperspectivePerceptron::biasmostly1
protected

Definition at line 273 of file multiperspective_perceptron.hh.

Referenced by computeOutput().

◆ blockSize

const int gem5::branch_prediction::MultiperspectivePerceptron::blockSize
protected

◆ blurrypath_bits

std::vector<std::vector<int> > gem5::branch_prediction::MultiperspectivePerceptron::blurrypath_bits
protected

◆ budgetbits

const int gem5::branch_prediction::MultiperspectivePerceptron::budgetbits
protected

Definition at line 289 of file multiperspective_perceptron.hh.

Referenced by computeBits().

◆ decay

const int gem5::branch_prediction::MultiperspectivePerceptron::decay
protected

Definition at line 283 of file multiperspective_perceptron.hh.

Referenced by update().

◆ doing_local

bool gem5::branch_prediction::MultiperspectivePerceptron::doing_local
protected

runtime values and data used to count the size in bits

Definition at line 366 of file multiperspective_perceptron.hh.

Referenced by computeBits(), and gem5::branch_prediction::MultiperspectivePerceptron::LOCAL::setBitRequirements().

◆ doing_recency

bool gem5::branch_prediction::MultiperspectivePerceptron::doing_recency
protected

◆ extra_rounds

const int gem5::branch_prediction::MultiperspectivePerceptron::extra_rounds
protected

Definition at line 287 of file multiperspective_perceptron.hh.

Referenced by train().

◆ extrabits

int gem5::branch_prediction::MultiperspectivePerceptron::extrabits
protected

Definition at line 374 of file multiperspective_perceptron.hh.

Referenced by computeBits(), and setExtraBits().

◆ fudge

const double gem5::branch_prediction::MultiperspectivePerceptron::fudge
protected

Definition at line 280 of file multiperspective_perceptron.hh.

Referenced by computeOutput().

◆ ghist_length

int gem5::branch_prediction::MultiperspectivePerceptron::ghist_length
protected

◆ hash_taken

const bool gem5::branch_prediction::MultiperspectivePerceptron::hash_taken
protected

Definition at line 285 of file multiperspective_perceptron.hh.

Referenced by update().

◆ hshift

const int gem5::branch_prediction::MultiperspectivePerceptron::hshift
protected

Definition at line 276 of file multiperspective_perceptron.hh.

Referenced by getIndex().

◆ imli_counter_bits

std::vector<int> gem5::branch_prediction::MultiperspectivePerceptron::imli_counter_bits
protected

◆ imli_mask1

const unsigned long long int gem5::branch_prediction::MultiperspectivePerceptron::imli_mask1
protected

◆ imli_mask4

const unsigned long long int gem5::branch_prediction::MultiperspectivePerceptron::imli_mask4
protected

◆ modghist_length

int gem5::branch_prediction::MultiperspectivePerceptron::modghist_length
protected

Definition at line 370 of file multiperspective_perceptron.hh.

Referenced by insertModhistSpec().

◆ modhist_indices

std::vector<int> gem5::branch_prediction::MultiperspectivePerceptron::modhist_indices
protected

◆ modhist_lengths

std::vector<int> gem5::branch_prediction::MultiperspectivePerceptron::modhist_lengths
protected

◆ modpath_indices

std::vector<int> gem5::branch_prediction::MultiperspectivePerceptron::modpath_indices
protected

◆ modpath_lengths

std::vector<int> gem5::branch_prediction::MultiperspectivePerceptron::modpath_lengths
protected

◆ n_sign_bits

const int gem5::branch_prediction::MultiperspectivePerceptron::n_sign_bits
protected

◆ nbest

const int gem5::branch_prediction::MultiperspectivePerceptron::nbest
protected

Definition at line 274 of file multiperspective_perceptron.hh.

Referenced by computeOutput(), and findBest().

◆ path_length

int gem5::branch_prediction::MultiperspectivePerceptron::path_length
protected

◆ pcbit

const int gem5::branch_prediction::MultiperspectivePerceptron::pcbit
protected

Definition at line 282 of file multiperspective_perceptron.hh.

Referenced by uncondBranch(), and update().

◆ pcshift

const int gem5::branch_prediction::MultiperspectivePerceptron::pcshift
protected

◆ recencypos_mask

const unsigned long long int gem5::branch_prediction::MultiperspectivePerceptron::recencypos_mask
protected

Definition at line 279 of file multiperspective_perceptron.hh.

Referenced by getIndex().

◆ record_mask

const unsigned int gem5::branch_prediction::MultiperspectivePerceptron::record_mask
protected

Definition at line 284 of file multiperspective_perceptron.hh.

Referenced by update().

◆ specs

std::vector<HistorySpec *> gem5::branch_prediction::MultiperspectivePerceptron::specs
protected

◆ speculative_update

const bool gem5::branch_prediction::MultiperspectivePerceptron::speculative_update
protected

Definition at line 290 of file multiperspective_perceptron.hh.

Referenced by MultiperspectivePerceptron().

◆ speed

const int gem5::branch_prediction::MultiperspectivePerceptron::speed
protected

Definition at line 288 of file multiperspective_perceptron.hh.

Referenced by train().

◆ table_sizes

std::vector<int> gem5::branch_prediction::MultiperspectivePerceptron::table_sizes
protected

◆ theta

int gem5::branch_prediction::MultiperspectivePerceptron::theta
protected

Definition at line 373 of file multiperspective_perceptron.hh.

Referenced by train().

◆ threadData

std::vector<ThreadData *> gem5::branch_prediction::MultiperspectivePerceptron::threadData
protected

◆ threshold

const int gem5::branch_prediction::MultiperspectivePerceptron::threshold
protected

Definition at line 269 of file multiperspective_perceptron.hh.

Referenced by computeBits(), computeOutput(), findBest(), lookup(), and train().

◆ thresholdCounter

int gem5::branch_prediction::MultiperspectivePerceptron::thresholdCounter
protected

Definition at line 372 of file multiperspective_perceptron.hh.

Referenced by train().

◆ tunebits

const int gem5::branch_prediction::MultiperspectivePerceptron::tunebits
protected

Definition at line 275 of file multiperspective_perceptron.hh.

Referenced by computeBits(), and train().

◆ tuneonly

const bool gem5::branch_prediction::MultiperspectivePerceptron::tuneonly
protected

Definition at line 286 of file multiperspective_perceptron.hh.

Referenced by train().

◆ xlat

int gem5::branch_prediction::MultiperspectivePerceptron::xlat
staticprotected
Initial value:
=
{1,3,4,5,7,8,9,11,12,14,15,17,19,21,23,25,27,29,32,34,37,41,45,49,53,58,63,
69,76,85,94,106,}

Transfer function for 6-width tables.

Definition at line 293 of file multiperspective_perceptron.hh.

Referenced by computeOutput(), and train().

◆ xlat4

int gem5::branch_prediction::MultiperspectivePerceptron::xlat4
staticprotected
Initial value:
=
{0,4,5,7,9,11,12,14,16,17,19,22,28,33,39,45,}

Transfer function for 5-width tables.

Definition at line 295 of file multiperspective_perceptron.hh.

Referenced by computeOutput(), and train().


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

Generated on Tue Sep 21 2021 12:28:48 for gem5 by doxygen 1.8.17