LTAGE Class Reference

#include <ltage.hh>

Inheritance diagram for LTAGE:

Classes
struct	BimodalEntry
struct	BranchInfo
struct	FoldedHistory
struct	LoopEntry
struct	TageEntry
struct	ThreadHistory

Public Member Functions
	LTAGE (const LTAGEParams *params)
void	uncondBranch (ThreadID tid, Addr br_pc, void *&bp_history) override
bool	lookup (ThreadID tid, Addr branch_addr, void *&bp_history) override
	Looks up a given PC in the BP to see if it is taken or not taken. 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...
void	update (ThreadID tid, Addr branch_addr, bool taken, void *bp_history, bool squashed) override
	Updates the BP with taken/not taken information. More...
void	squash (ThreadID tid, void *bp_history) override
unsigned	getGHR (ThreadID tid, void *bp_history) const override
Public Member Functions inherited from BPredUnit
	BPredUnit (const Params *p)
void	regStats () override
	Registers statistics. More...
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 SimObject
const Params *	params () const
	SimObject (const Params *_params)
virtual	~SimObject ()
virtual const std::string	name () const
virtual void	init ()
	init() is called after all C++ SimObjects have been created and all ports are connected. More...
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	resetStats ()
	Reset statistics associated with this object. More...
virtual void	regProbeListeners ()
	Register probe listeners for this object. More...
ProbeManager *	getProbeManager ()
	Get the probe manager for this object. 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 EventManager
	EventManager (EventManager &em)
	EventManager (EventManager *em)
	EventManager (EventQueue *eq)
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)
void	setCurTick (Tick newVal)
Public Member Functions inherited from 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 Drainable
DrainState	drainState () const
	Return the current drain state of an object. More...
virtual void	notifyFork ()
	Notify a child process of a fork. More...

Private Member Functions
int	bindex (Addr pc_in) const
	Computes the index used to access the bimodal table. More...
int	lindex (Addr pc_in) const
	Computes the index used to access the loop predictor. More...
int	gindex (ThreadID tid, Addr pc, int bank) const
	Computes the index used to access a partially tagged table. More...
int	F (int phist, int size, int bank) const
	Utility function to shuffle the path history depending on which tagged table we are accessing. More...
uint16_t	gtag (ThreadID tid, Addr pc, int bank) const
	Computes the partial tag of a tagged table. More...
void	ctrUpdate (int8_t &ctr, bool taken, int nbits)
	Updates a direction counter based on the actual branch outcome. More...
bool	getBimodePred (Addr pc, BranchInfo *bi) const
	Get a branch prediction from the bimodal predictor. More...
void	baseUpdate (Addr pc, bool taken, BranchInfo *bi)
	Updates the bimodal predictor. More...
bool	getLoop (Addr pc, BranchInfo *bi) const
	Get a branch prediction from the loop predictor. More...
void	loopUpdate (Addr pc, bool Taken, BranchInfo *bi)
	Updates the loop predictor. More...
void	updateGHist (uint8_t *&h, bool dir, uint8_t *tab, int &PT)
	(Speculatively) updates the global branch history. More...
bool	predict (ThreadID tid, Addr branch_pc, bool cond_branch, void *&b)
	Get a branch prediction from L-TAGE. More...
void	update (ThreadID tid, Addr branch_pc, bool taken, BranchInfo *bi)
	Update L-TAGE. More...
void	updateHistories (ThreadID tid, Addr branch_pc, bool taken, void *b)
	(Speculatively) updates global histories (path and direction). More...
void	squash (ThreadID tid, bool taken, void *bp_history)
	Restores speculatively updated path and direction histories. More...
void	specLoopUpdate (Addr pc, bool taken, BranchInfo *bi)
	Speculatively updates the loop predictor iteration count. More...

Private Attributes
const unsigned	logSizeBiMP
const unsigned	logSizeTagTables
const unsigned	logSizeLoopPred
const unsigned	nHistoryTables
const unsigned	tagTableCounterBits
const unsigned	histBufferSize
const unsigned	minHist
const unsigned	maxHist
const unsigned	minTagWidth
BimodalEntry *	btable
TageEntry **	gtable
LoopEntry *	ltable
std::vector< ThreadHistory >	threadHistory
int	tagWidths [15]
int	tagTableSizes [15]
int *	histLengths
int *	tableIndices
int *	tableTags
int8_t	loopUseCounter
int8_t	useAltPredForNewlyAllocated
int	tCounter
int	logTick

Additional Inherited Members
Public Types inherited from BPredUnit
typedef BranchPredictorParams	Params
Public Types inherited from SimObject
typedef SimObjectParams	Params
Static Public Member Functions inherited from SimObject
static void	serializeAll (CheckpointOut &cp)
	Serialize 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 Public Member Functions inherited from Serializable
static const std::string &	currentSection ()
	Get the fully-qualified name of the active section. More...
static void	serializeAll (const std::string &cpt_dir)
static void	unserializeGlobals (CheckpointIn &cp)
Static Public Attributes inherited from Serializable
static int	ckptCount = 0
static int	ckptMaxCount = 0
static int	ckptPrevCount = -1
Protected Member Functions inherited from BPredUnit
ProbePoints::PMUUPtr	pmuProbePoint (const char *name)
	Helper method to instantiate probe points belonging to this object. More...
Protected Member Functions inherited from 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 inherited from BPredUnit
const unsigned	instShiftAmt
	Number of bits to shift instructions by for predictor addresses. More...
ProbePoints::PMUUPtr	ppBranches
	Branches seen by the branch predictor. More...
ProbePoints::PMUUPtr	ppMisses
	Miss-predicted branches. More...
Protected Attributes inherited from SimObject
const SimObjectParams *	_params
	Cached copy of the object parameters. More...
Protected Attributes inherited from EventManager
EventQueue *	eventq
	A pointer to this object's event queue. More...

Detailed Description

Definition at line 61 of file ltage.hh.

Constructor & Destructor Documentation

LTAGE::LTAGE

(

const LTAGEParams *

params

)

Definition at line 50 of file ltage.cc.

References btable, DPRINTF, gtable, histBufferSize, histLengths, ArmISA::i, LTAGE::FoldedHistory::init(), logSizeBiMP, logSizeLoopPred, logSizeTagTables, logTick, loopUseCounter, ltable, maxHist, minHist, minTagWidth, nHistoryTables, tableIndices, tableTags, tagTableSizes, tagWidths, tCounter, threadHistory, ULL, and useAltPredForNewlyAllocated.

Member Function Documentation

void LTAGE::baseUpdate ( Addr  pc, bool  taken, BranchInfo *  bi  )

private

Updates the bimodal predictor.

Parameters

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

Definition at line 218 of file ltage.cc.

References LTAGE::BranchInfo::bimodalIndex, btable, DPRINTF, LTAGE::BimodalEntry::hyst, if(), and LTAGE::BimodalEntry::pred.

Referenced by update().

int LTAGE::bindex ( Addr  pc_in ) const

private

Computes the index used to access the bimodal table.

Parameters

pc_in

The unshifted branch PC.

Definition at line 139 of file ltage.cc.

References logSizeBiMP, and ULL.

Referenced by predict().

void LTAGE::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_PC	The PC to look up the local predictor.
bp_history	Pointer that will be set to an object that has the branch predictor state associated with the lookup.

Implements BPredUnit.

Definition at line 715 of file ltage.cc.

References PowerISA::bi, LTAGE::BranchInfo::ci, LTAGE::FoldedHistory::comp, LTAGE::ThreadHistory::computeIndices, LTAGE::ThreadHistory::computeTags, LTAGE::BranchInfo::ct0, LTAGE::BranchInfo::ct1, DPRINTF, LTAGE::ThreadHistory::gHist, LTAGE::ThreadHistory::globalHistory, ArmISA::i, nHistoryTables, LTAGE::ThreadHistory::ptGhist, threadHistory, and LTAGE::FoldedHistory::update().

void LTAGE::ctrUpdate ( int8_t &  ctr, bool  taken, int  nbits  )

private

Updates a direction counter based on the actual branch outcome.

Parameters

ctr	Reference to counter to update.
taken	Actual branch outcome.
nbits	Counter width.

Definition at line 195 of file ltage.cc.

Referenced by update().

int LTAGE::F ( int  phist, int  size, int  bank  ) const

private

Utility function to shuffle the path history depending on which tagged table we are accessing.

Parameters

phist	The path history.
size	Number of path history bits to use.
bank	The partially tagged table to access.

Definition at line 151 of file ltage.cc.

References X86ISA::size(), tagTableSizes, and ULL.

Referenced by gindex().

bool LTAGE::getBimodePred ( Addr  pc, BranchInfo *  bi  ) const

private

Get a branch prediction from the bimodal predictor.

Parameters

pc	The unshifted branch PC.
bi	Pointer to information on the prediction.

Definition at line 209 of file ltage.cc.

References LTAGE::BranchInfo::bimodalIndex, btable, and LTAGE::BimodalEntry::pred.

Referenced by predict().

unsigned LTAGE::getGHR ( ThreadID  tid, void *  bp_history  ) const

overridevirtual

Reimplemented from BPredUnit.

Definition at line 386 of file ltage.cc.

References PowerISA::bi, histBufferSize, ArmISA::i, LTAGE::BranchInfo::ptGhist, threadHistory, and X86ISA::val.

bool LTAGE::getLoop ( Addr  pc, BranchInfo *  bi  ) const

private

Get a branch prediction from the loop predictor.

Parameters

pc	The unshifted branch PC.
bi	Pointer to information on the prediction.

Definition at line 237 of file ltage.cc.

References LTAGE::LoopEntry::confidence, LTAGE::BranchInfo::currentIter, LTAGE::LoopEntry::currentIterSpec, LTAGE::LoopEntry::dir, ArmISA::i, lindex(), logSizeLoopPred, LTAGE::BranchInfo::loopHit, LTAGE::BranchInfo::loopIndex, LTAGE::BranchInfo::loopPredValid, LTAGE::BranchInfo::loopTag, ltable, LTAGE::LoopEntry::numIter, pc, and LTAGE::LoopEntry::tag.

Referenced by predict().

int LTAGE::gindex ( ThreadID  tid, Addr  pc, int  bank  ) const

inlineprivate

Computes the index used to access a partially tagged table.

Parameters

tid	The thread ID used to select the global histories to use.
pc	The unshifted branch PC.
bank	The partially tagged table to access.

Definition at line 169 of file ltage.cc.

References F(), histLengths, MipsISA::index, pc, tagTableSizes, threadHistory, and ULL.

Referenced by predict().

uint16_t LTAGE::gtag ( ThreadID  tid, Addr  pc, int  bank  ) const

inlineprivate

Computes the partial tag of a tagged table.

Parameters

tid	the thread ID used to select the global histories to use.
pc	The unshifted branch PC.
bank	The partially tagged table to access.

Definition at line 184 of file ltage.cc.

References pc, tagWidths, threadHistory, and ULL.

Referenced by predict().

int LTAGE::lindex ( Addr  pc_in ) const

private

Computes the index used to access the loop predictor.

Parameters

pc_in

The unshifted branch PC.

Definition at line 145 of file ltage.cc.

References logSizeLoopPred, and ULL.

Referenced by getLoop(), and specLoopUpdate().

bool LTAGE::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_PC	The PC to look up.
bp_history	Pointer 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 BPredUnit.

Definition at line 702 of file ltage.cc.

References DPRINTF, predict(), threadHistory, and updateHistories().

void LTAGE::loopUpdate ( Addr  pc, bool  Taken, BranchInfo *  bi  )

private

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.

Definition at line 274 of file ltage.cc.

References LTAGE::LoopEntry::age, LTAGE::LoopEntry::confidence, LTAGE::LoopEntry::currentIter, LTAGE::LoopEntry::dir, DPRINTF, ArmISA::i, LTAGE::BranchInfo::loopHit, LTAGE::BranchInfo::loopIndex, LTAGE::BranchInfo::loopPred, LTAGE::BranchInfo::loopPredValid, LTAGE::BranchInfo::loopTag, ltable, LTAGE::LoopEntry::numIter, Random::random(), random_mt, LTAGE::LoopEntry::tag, and LTAGE::BranchInfo::tagePred.

Referenced by update().

bool LTAGE::predict ( ThreadID  tid, Addr  branch_pc, bool  cond_branch, void *&  b  )

private

Get a branch prediction from L-TAGE.

NOT an override of BpredUnit::predict().

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.
b	Reference to wrapping pointer to allow storing derived class prediction information in the base class.

Definition at line 403 of file ltage.cc.

References LTAGE::BranchInfo::altBank, LTAGE::BranchInfo::altBankIndex, LTAGE::BranchInfo::altTaken, PowerISA::bi, LTAGE::BranchInfo::bimodalIndex, bindex(), LTAGE::BranchInfo::branchPC, LTAGE::BranchInfo::condBranch, LTAGE::TageEntry::ctr, DPRINTF, getBimodePred(), getLoop(), gindex(), gtable, gtag(), LTAGE::BranchInfo::hitBank, LTAGE::BranchInfo::hitBankIndex, ArmISA::i, LTAGE::BranchInfo::longestMatchPred, LTAGE::BranchInfo::loopHit, LTAGE::BranchInfo::loopPred, LTAGE::BranchInfo::loopPredValid, loopUseCounter, nHistoryTables, pc, LTAGE::BranchInfo::pseudoNewAlloc, specLoopUpdate(), LTAGE::BranchInfo::tableIndices, tableIndices, LTAGE::BranchInfo::tableTags, tableTags, LTAGE::BranchInfo::tagePred, and useAltPredForNewlyAllocated.

Referenced by lookup(), and uncondBranch().

void LTAGE::specLoopUpdate ( Addr  pc, bool  taken, BranchInfo *  bi  )

private

Speculatively updates the loop predictor iteration count.

Parameters

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

Definition at line 261 of file ltage.cc.

References LTAGE::LoopEntry::currentIterSpec, MipsISA::index, lindex(), LTAGE::BranchInfo::loopHit, and ltable.

Referenced by predict().

void LTAGE::squash ( ThreadID  tid, void *  bp_history  )

overridevirtual

Parameters

bp_history

Pointer to the history object. The predictor will need to update any state and delete the object.

Implements BPredUnit.

Definition at line 687 of file ltage.cc.

References PowerISA::bi, LTAGE::BranchInfo::branchPC, LTAGE::BranchInfo::condBranch, LTAGE::BranchInfo::currentIter, LTAGE::LoopEntry::currentIterSpec, DPRINTF, LTAGE::BranchInfo::loopHit, LTAGE::BranchInfo::loopIndex, and ltable.

Referenced by update().

void LTAGE::squash ( ThreadID  tid, bool  taken, void *  bp_history  )

private

Restores speculatively updated path and direction histories.

Also recomputes compressed (folded) histories based on the correct branch outcome. This version of squash() is called once on a branch misprediction.

Parameters

tid	The Thread ID to select the histories to rollback.
taken	The correct branch outcome.
bp_history	Wrapping pointer to BranchInfo (to allow storing derived class prediction information in the base class).

Postcondition

bp_history points to valid memory.

Definition at line 658 of file ltage.cc.

References PowerISA::bi, LTAGE::BranchInfo::branchPC, LTAGE::BranchInfo::ci, LTAGE::FoldedHistory::comp, LTAGE::ThreadHistory::computeIndices, LTAGE::ThreadHistory::computeTags, LTAGE::BranchInfo::condBranch, LTAGE::BranchInfo::ct0, LTAGE::BranchInfo::ct1, LTAGE::BranchInfo::currentIter, LTAGE::LoopEntry::currentIterSpec, DPRINTF, LTAGE::ThreadHistory::gHist, LTAGE::ThreadHistory::globalHistory, ArmISA::i, LTAGE::BranchInfo::loopHit, LTAGE::BranchInfo::loopIndex, ltable, nHistoryTables, LTAGE::BranchInfo::pathHist, LTAGE::ThreadHistory::pathHist, LTAGE::BranchInfo::ptGhist, LTAGE::ThreadHistory::ptGhist, threadHistory, and LTAGE::FoldedHistory::update().

void LTAGE::uncondBranch ( ThreadID  tid, Addr  br_pc, void *&  bp_history  )

overridevirtual

Implements BPredUnit.

Definition at line 733 of file ltage.cc.

References DPRINTF, predict(), threadHistory, and updateHistories().

void LTAGE::update ( ThreadID  tid, Addr  instPC, bool  taken, void *  bp_history, bool  squashed  )

overridevirtual

Updates the BP with taken/not taken information.

Parameters

inst_PC	The branch's PC that will be updated.
taken	Whether the branch was taken or not taken.
bp_history	Pointer to the branch predictor state that is associated with the branch lookup that is being updated.
squashed	Set to true when this function is called during a squash operation.

Todo:

Make this update flexible enough to handle a global predictor.

Implements BPredUnit.

Definition at line 489 of file ltage.cc.

References LTAGE::BranchInfo::altBank, LTAGE::BranchInfo::altBankIndex, LTAGE::BranchInfo::altTaken, baseUpdate(), PowerISA::bi, LTAGE::BranchInfo::condBranch, LTAGE::TageEntry::ctr, ctrUpdate(), DPRINTF, gtable, LTAGE::BranchInfo::hitBank, LTAGE::BranchInfo::hitBankIndex, ArmISA::i, ArmISA::j, logTick, LTAGE::BranchInfo::longestMatchPred, LTAGE::BranchInfo::loopPred, LTAGE::BranchInfo::loopPredValid, loopUpdate(), loopUseCounter, nHistoryTables, pc, LTAGE::BranchInfo::pseudoNewAlloc, Random::random(), random_mt, squash(), LTAGE::BranchInfo::tableIndices, LTAGE::BranchInfo::tableTags, LTAGE::TageEntry::tag, LTAGE::BranchInfo::tagePred, tagTableCounterBits, tagTableSizes, tCounter, LTAGE::TageEntry::u, ULL, useAltPredForNewlyAllocated, and X86ISA::X.

void LTAGE::update ( ThreadID  tid, Addr  branch_pc, bool  taken, BranchInfo *  bi  )

private

Update L-TAGE.

Called at execute to repair histories on a misprediction and at commit to update the tables.

Parameters

tid	The thread ID to select the global histories to use.
branch_pc	The unshifted branch PC.
taken	Actual branch outcome.
bi	Pointer to information on the prediction recorded at prediction time.

void LTAGE::updateGHist ( uint8_t *&  h, bool  dir, uint8_t *  tab, int &  PT  )

private

(Speculatively) updates the global branch history.

Parameters

h	Reference to pointer to global branch history.
dir	(Predicted) outcome to update the histories with.
tab
PT	Reference to path history.

Definition at line 365 of file ltage.cc.

References DPRINTF, histBufferSize, ArmISA::i, and maxHist.

Referenced by updateHistories().

void LTAGE::updateHistories ( ThreadID  tid, Addr  branch_pc, bool  taken, void *  b  )

private

(Speculatively) updates global histories (path and direction).

Also recomputes compressed (folded) histories based on the branch direction.

Parameters

tid	The thread ID to select the histories to update.
branch_pc	The unshifted branch PC.
taken	(Predicted) branch direction.
b	Wrapping pointer to BranchInfo (to allow storing derived class prediction information in the base class).

Definition at line 628 of file ltage.cc.

References PowerISA::bi, LTAGE::BranchInfo::ci, LTAGE::FoldedHistory::comp, LTAGE::ThreadHistory::computeIndices, LTAGE::ThreadHistory::computeTags, LTAGE::BranchInfo::ct0, LTAGE::BranchInfo::ct1, DPRINTF, LTAGE::ThreadHistory::gHist, LTAGE::ThreadHistory::globalHistory, ArmISA::i, nHistoryTables, LTAGE::BranchInfo::pathHist, LTAGE::ThreadHistory::pathHist, LTAGE::BranchInfo::ptGhist, LTAGE::ThreadHistory::ptGhist, threadHistory, ULL, LTAGE::FoldedHistory::update(), and updateGHist().

Referenced by lookup(), and uncondBranch().

Member Data Documentation

BimodalEntry* LTAGE::btable

private

Definition at line 367 of file ltage.hh.

Referenced by baseUpdate(), getBimodePred(), and LTAGE().

TageEntry** LTAGE::gtable

private

Definition at line 368 of file ltage.hh.

Referenced by LTAGE(), predict(), and update().

const unsigned LTAGE::histBufferSize

private

Definition at line 362 of file ltage.hh.

Referenced by getGHR(), LTAGE(), and updateGHist().

int* LTAGE::histLengths

private

Definition at line 398 of file ltage.hh.

Referenced by gindex(), and LTAGE().

const unsigned LTAGE::logSizeBiMP

private

Definition at line 357 of file ltage.hh.

Referenced by bindex(), and LTAGE().

const unsigned LTAGE::logSizeLoopPred

private

Definition at line 359 of file ltage.hh.

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

const unsigned LTAGE::logSizeTagTables

private

Definition at line 358 of file ltage.hh.

Referenced by LTAGE().

int LTAGE::logTick

private

Definition at line 405 of file ltage.hh.

Referenced by LTAGE(), and update().

int8_t LTAGE::loopUseCounter

private

Definition at line 402 of file ltage.hh.

Referenced by LTAGE(), predict(), and update().

LoopEntry* LTAGE::ltable

private

Definition at line 369 of file ltage.hh.

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

const unsigned LTAGE::maxHist

private

Definition at line 364 of file ltage.hh.

Referenced by LTAGE(), and updateGHist().

const unsigned LTAGE::minHist

private

Definition at line 363 of file ltage.hh.

Referenced by LTAGE().

const unsigned LTAGE::minTagWidth

private

Definition at line 365 of file ltage.hh.

Referenced by LTAGE().

const unsigned LTAGE::nHistoryTables

private

Definition at line 360 of file ltage.hh.

Referenced by btbUpdate(), LTAGE(), predict(), squash(), update(), and updateHistories().

int* LTAGE::tableIndices

private

Definition at line 399 of file ltage.hh.

Referenced by LTAGE(), and predict().

int* LTAGE::tableTags

private

Definition at line 400 of file ltage.hh.

Referenced by LTAGE(), and predict().

const unsigned LTAGE::tagTableCounterBits

private

Definition at line 361 of file ltage.hh.

Referenced by update().

int LTAGE::tagTableSizes[15]

private

Definition at line 397 of file ltage.hh.

Referenced by F(), gindex(), LTAGE(), and update().

int LTAGE::tagWidths[15]

private

Definition at line 396 of file ltage.hh.

Referenced by gtag(), and LTAGE().

int LTAGE::tCounter

private

Definition at line 404 of file ltage.hh.

Referenced by LTAGE(), and update().

std::vector<ThreadHistory> LTAGE::threadHistory

private

Definition at line 394 of file ltage.hh.

Referenced by btbUpdate(), getGHR(), gindex(), gtag(), lookup(), LTAGE(), squash(), uncondBranch(), and updateHistories().

int8_t LTAGE::useAltPredForNewlyAllocated

private

Definition at line 403 of file ltage.hh.

Referenced by LTAGE(), predict(), and update().

---

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

• cpu/pred/ltage.hh
• cpu/pred/ltage.cc