DefaultRename handles both single threaded and SMT rename. More...

#include <rename.hh>

Classes
struct	FreeEntries
	Structures whose free entries impact the amount of instructions that can be renamed. More...

struct	RenameHistory
	Holds the information for each destination register rename. More...

struct	Stalls
	Source of possible stalls. More...

Public Types
enum	RenameStatus { Active, Inactive }
	Overall rename status. More...

enum	ThreadStatus { Running, Idle, StartSquash, Squashing, Blocked, Unblocking, SerializeStall }
	Individual thread status. More...

typedef Impl::CPUPol	CPUPol

typedef Impl::DynInstPtr	DynInstPtr

typedef Impl::O3CPU	O3CPU

typedef CPUPol::DecodeStruct	DecodeStruct

typedef CPUPol::RenameStruct	RenameStruct

typedef CPUPol::TimeStruct	TimeStruct

typedef CPUPol::FreeList	FreeList

typedef CPUPol::RenameMap	RenameMap

typedef CPUPol::IEW	IEW

typedef CPUPol::Commit	Commit

typedef TheISA::RegIndex	RegIndex

typedef std::deque< DynInstPtr >	InstQueue

Public Member Functions
	DefaultRename (O3CPU _cpu, DerivO3CPUParams params)
	DefaultRename constructor. More...

std::string	name () const
	Returns the name of rename. More...

void	regStats ()
	Registers statistics. More...

void	regProbePoints ()
	Registers probes. More...

void	setTimeBuffer (TimeBuffer< TimeStruct > *tb_ptr)
	Sets the main backwards communication time buffer pointer. More...

void	setRenameQueue (TimeBuffer< RenameStruct > *rq_ptr)
	Sets pointer to time buffer used to communicate to the next stage. More...

void	setDecodeQueue (TimeBuffer< DecodeStruct > *dq_ptr)
	Sets pointer to time buffer coming from decode. More...

void	setIEWStage (IEW *iew_stage)
	Sets pointer to IEW stage. More...

void	setCommitStage (Commit *commit_stage)
	Sets pointer to commit stage. More...

void	startupStage ()
	Initializes variables for the stage. More...

void	setActiveThreads (std::list< ThreadID > *at_ptr)
	Sets pointer to list of active threads. More...

void	setRenameMap (RenameMap rm_ptr[Impl::MaxThreads])
	Sets pointer to rename maps (per-thread structures). More...

void	setFreeList (FreeList *fl_ptr)
	Sets pointer to the free list. More...

void	setScoreboard (Scoreboard *_scoreboard)
	Sets pointer to the scoreboard. More...

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

bool	isDrained () const
	Has the stage drained? More...

void	takeOverFrom ()
	Takes over from another CPU's thread. More...

void	squash (const InstSeqNum &squash_seq_num, ThreadID tid)
	Squashes all instructions in a thread. More...

void	tick ()
	Ticks rename, which processes all input signals and attempts to rename as many instructions as possible. More...

void	dumpHistory ()
	Debugging function used to dump history buffer of renamings. More...

Private Types
enum	FullSource { ROB, IQ, LQ, SQ, NONE }
	Enum to record the source of a structure full stall. More...

typedef std::pair< InstSeqNum, short int >	SeqNumRegPair
	Probe points. More...

Private Member Functions
void	resetStage ()
	Reset this pipeline stage. More...

void	rename (bool &status_change, ThreadID tid)
	Determines what to do based on rename's current status. More...

void	renameInsts (ThreadID tid)
	Renames instructions for the given thread. More...

void	skidInsert (ThreadID tid)
	Inserts unused instructions from a given thread into the skid buffer, to be renamed once rename unblocks. More...

void	sortInsts ()
	Separates instructions from decode into individual lists of instructions sorted by thread. More...

bool	skidsEmpty ()
	Returns if all of the skid buffers are empty. More...

void	updateStatus ()
	Updates overall rename status based on all of the threads' statuses. More...

bool	block (ThreadID tid)
	Switches rename to blocking, and signals back that rename has become blocked. More...

bool	unblock (ThreadID tid)
	Switches rename to unblocking if the skid buffer is empty, and signals back that rename has unblocked. More...

void	doSquash (const InstSeqNum &squash_seq_num, ThreadID tid)
	Executes actual squash, removing squashed instructions. More...

void	removeFromHistory (InstSeqNum inst_seq_num, ThreadID tid)
	Removes a committed instruction's rename history. More...

void	renameSrcRegs (DynInstPtr &inst, ThreadID tid)
	Renames the source registers of an instruction. More...

void	renameDestRegs (DynInstPtr &inst, ThreadID tid)
	Renames the destination registers of an instruction. More...

int	calcFreeROBEntries (ThreadID tid)
	Calculates the number of free ROB entries for a specific thread. More...

int	calcFreeIQEntries (ThreadID tid)
	Calculates the number of free IQ entries for a specific thread. More...

int	calcFreeLQEntries (ThreadID tid)
	Calculates the number of free LQ entries for a specific thread. More...

int	calcFreeSQEntries (ThreadID tid)
	Calculates the number of free SQ entries for a specific thread. More...

unsigned	validInsts ()
	Returns the number of valid instructions coming from decode. More...

void	readStallSignals (ThreadID tid)
	Reads signals telling rename to block/unblock. More...

bool	checkStall (ThreadID tid)
	Checks if any stages are telling rename to block. More...

void	readFreeEntries (ThreadID tid)
	Gets the number of free entries for a specific thread. More...

bool	checkSignalsAndUpdate (ThreadID tid)
	Checks the signals and updates the status. More...

void	serializeAfter (InstQueue &inst_list, ThreadID tid)
	Either serializes on the next instruction available in the InstQueue, or records that it must serialize on the next instruction to enter rename. More...

void	incrFullStat (const FullSource &source)
	Function used to increment the stat that corresponds to the source of the stall. More...

Private Attributes
RenameStatus	_status
	Rename status. More...

ThreadStatus	renameStatus [Impl::MaxThreads]
	Per-thread status. More...

ProbePointArg< DynInstPtr > *	ppRename
	To probe when register renaming for an instruction is complete. More...

ProbePointArg< SeqNumRegPair > *	ppSquashInRename
	To probe when an instruction is squashed and the register mapping for it needs to be undone. More...

IEW *	iew_ptr
	Pointer to IEW stage. More...

Commit *	commit_ptr
	Pointer to commit stage. More...

std::list< RenameHistory >	historyBuffer [Impl::MaxThreads]
	A per-thread list of all destination register renames, used to either undo rename mappings or free old physical registers. More...

O3CPU *	cpu
	Pointer to CPU. More...

TimeBuffer< TimeStruct > *	timeBuffer
	Pointer to main time buffer used for backwards communication. More...

TimeBuffer< TimeStruct >::wire	fromIEW
	Wire to get IEW's output from backwards time buffer. More...

TimeBuffer< TimeStruct >::wire	fromCommit
	Wire to get commit's output from backwards time buffer. More...

TimeBuffer< TimeStruct >::wire	toDecode
	Wire to write infromation heading to previous stages. More...

TimeBuffer< RenameStruct > *	renameQueue
	Rename instruction queue. More...

TimeBuffer< RenameStruct >::wire	toIEW
	Wire to write any information heading to IEW. More...

TimeBuffer< DecodeStruct > *	decodeQueue
	Decode instruction queue interface. More...

TimeBuffer< DecodeStruct >::wire	fromDecode
	Wire to get decode's output from decode queue. More...

InstQueue	insts [Impl::MaxThreads]
	Queue of all instructions coming from decode this cycle. More...

InstQueue	skidBuffer [Impl::MaxThreads]
	Skid buffer between rename and decode. More...

RenameMap *	renameMap [Impl::MaxThreads]
	Rename map interface. More...

FreeList *	freeList
	Free list interface. More...

std::list< ThreadID > *	activeThreads
	Pointer to the list of active threads. More...

Scoreboard *	scoreboard
	Pointer to the scoreboard. More...

int	instsInProgress [Impl::MaxThreads]
	Count of instructions in progress that have been sent off to the IQ and ROB, but are not yet included in their occupancy counts. More...

int	loadsInProgress [Impl::MaxThreads]
	Count of Load instructions in progress that have been sent off to the IQ and ROB, but are not yet included in their occupancy counts. More...

int	storesInProgress [Impl::MaxThreads]
	Count of Store instructions in progress that have been sent off to the IQ and ROB, but are not yet included in their occupancy counts. More...

bool	wroteToTimeBuffer
	Variable that tracks if decode has written to the time buffer this cycle. More...

FreeEntries	freeEntries [Impl::MaxThreads]
	Per-thread tracking of the number of free entries of back-end structures. More...

bool	emptyROB [Impl::MaxThreads]
	Records if the ROB is empty. More...

Stalls	stalls [Impl::MaxThreads]
	Tracks which stages are telling decode to stall. More...

DynInstPtr	serializeInst [Impl::MaxThreads]
	The serialize instruction that rename has stalled on. More...

bool	serializeOnNextInst [Impl::MaxThreads]
	Records if rename needs to serialize on the next instruction for any thread. More...

int	iewToRenameDelay
	Delay between iew and rename, in ticks. More...

int	decodeToRenameDelay
	Delay between decode and rename, in ticks. More...

unsigned	commitToRenameDelay
	Delay between commit and rename, in ticks. More...

unsigned	renameWidth
	Rename width, in instructions. More...

unsigned	commitWidth
	Commit width, in instructions. More...

unsigned	toIEWIndex
	The index of the instruction in the time buffer to IEW that rename is currently using. More...

bool	blockThisCycle
	Whether or not rename needs to block this cycle. More...

bool	resumeSerialize
	Whether or not rename needs to resume a serialize instruction after squashing. More...

bool	resumeUnblocking
	Whether or not rename needs to resume clearing out the skidbuffer after squashing. More...

ThreadID	numThreads
	The number of threads active in rename. More...

unsigned	skidBufferMax
	The maximum skid buffer size. More...

PhysRegIndex	maxPhysicalRegs

Stats::Scalar	renameSquashCycles
	Stat for total number of cycles spent squashing. More...

Stats::Scalar	renameIdleCycles
	Stat for total number of cycles spent idle. More...

Stats::Scalar	renameBlockCycles
	Stat for total number of cycles spent blocking. More...

Stats::Scalar	renameSerializeStallCycles
	Stat for total number of cycles spent stalling for a serializing inst. More...

Stats::Scalar	renameRunCycles
	Stat for total number of cycles spent running normally. More...

Stats::Scalar	renameUnblockCycles
	Stat for total number of cycles spent unblocking. More...

Stats::Scalar	renameRenamedInsts
	Stat for total number of renamed instructions. More...

Stats::Scalar	renameSquashedInsts
	Stat for total number of squashed instructions that rename discards. More...

Stats::Scalar	renameROBFullEvents
	Stat for total number of times that the ROB starts a stall in rename. More...

Stats::Scalar	renameIQFullEvents
	Stat for total number of times that the IQ starts a stall in rename. More...

Stats::Scalar	renameLQFullEvents
	Stat for total number of times that the LQ starts a stall in rename. More...

Stats::Scalar	renameSQFullEvents
	Stat for total number of times that the SQ starts a stall in rename. More...

Stats::Scalar	renameFullRegistersEvents
	Stat for total number of times that rename runs out of free registers to use to rename. More...

Stats::Scalar	renameRenamedOperands
	Stat for total number of renamed destination registers. More...

Stats::Scalar	renameRenameLookups
	Stat for total number of source register rename lookups. More...

Stats::Scalar	intRenameLookups

Stats::Scalar	fpRenameLookups

Stats::Scalar	renameCommittedMaps
	Stat for total number of committed renaming mappings. More...

Stats::Scalar	renameUndoneMaps
	Stat for total number of mappings that were undone due to a squash. More...

Stats::Scalar	renamedSerializing
	Number of serialize instructions handled. More...

Stats::Scalar	renamedTempSerializing
	Number of instructions marked as temporarily serializing. More...

Stats::Scalar	renameSkidInsts
	Number of instructions inserted into skid buffers. More...

Detailed Description

template<class Impl>
class DefaultRename< Impl >

DefaultRename handles both single threaded and SMT rename.

Its width is specified by the parameters; each cycle it tries to rename that many instructions. It holds onto the rename history of all instructions with destination registers, storing the arch. register, the new physical register, and the old physical register, to allow for undoing of mappings if squashing happens, or freeing up registers upon commit. Rename handles blocking if the ROB, IQ, or LSQ is going to be full. Rename also handles barriers, and does so by stalling on the instruction until the ROB is empty and there are no instructions in flight to the ROB.

Definition at line 70 of file rename.hh.

Member Typedef Documentation

template<class Impl >

typedef CPUPol::Commit DefaultRename< Impl >::Commit

Definition at line 86 of file rename.hh.

template<class Impl >

typedef Impl::CPUPol DefaultRename< Impl >::CPUPol

Definition at line 74 of file rename.hh.

template<class Impl >

typedef CPUPol::DecodeStruct DefaultRename< Impl >::DecodeStruct

Definition at line 79 of file rename.hh.

template<class Impl >

typedef Impl::DynInstPtr DefaultRename< Impl >::DynInstPtr

Definition at line 75 of file rename.hh.

template<class Impl >

typedef CPUPol::FreeList DefaultRename< Impl >::FreeList

Definition at line 82 of file rename.hh.

template<class Impl >

typedef CPUPol::IEW DefaultRename< Impl >::IEW

Definition at line 85 of file rename.hh.

template<class Impl >

typedef std::deque<DynInstPtr> DefaultRename< Impl >::InstQueue

Definition at line 95 of file rename.hh.

template<class Impl >

typedef Impl::O3CPU DefaultRename< Impl >::O3CPU

Definition at line 76 of file rename.hh.

template<class Impl >

typedef TheISA::RegIndex DefaultRename< Impl >::RegIndex

Definition at line 89 of file rename.hh.

template<class Impl >

typedef CPUPol::RenameMap DefaultRename< Impl >::RenameMap

Definition at line 83 of file rename.hh.

template<class Impl >

typedef CPUPol::RenameStruct DefaultRename< Impl >::RenameStruct

Definition at line 80 of file rename.hh.

template<class Impl >

typedef std::pair<InstSeqNum, short int> DefaultRename< Impl >::SeqNumRegPair

private

Probe points.

Definition at line 125 of file rename.hh.

template<class Impl >

typedef CPUPol::TimeStruct DefaultRename< Impl >::TimeStruct

Definition at line 81 of file rename.hh.

Member Enumeration Documentation

template<class Impl >

enum DefaultRename::FullSource

private

Enum to record the source of a structure full stall.

Can come from either ROB, IQ, LSQ, and it is priortized in that order.

Enumerator
ROB
IQ
LQ
SQ
NONE

Definition at line 473 of file rename.hh.

template<class Impl >

enum DefaultRename::RenameStatus

Overall rename status.

Used to determine if the CPU can deschedule itself due to a lack of activity.

Enumerator
Active
Inactive

Definition at line 101 of file rename.hh.

template<class Impl >

enum DefaultRename::ThreadStatus

Individual thread status.

Enumerator
Running
Idle
StartSquash
Squashing
Blocked
Unblocking
SerializeStall

Definition at line 107 of file rename.hh.

Constructor & Destructor Documentation

template<class Impl >

DefaultRename< Impl >::DefaultRename	(	O3CPU *	_cpu,
		DerivO3CPUParams *	params
	)

DefaultRename constructor.

Definition at line 63 of file rename_impl.hh.

References DefaultRename< Impl >::decodeToRenameDelay, fatal, DefaultRename< Impl >::renameWidth, and DefaultRename< Impl >::skidBufferMax.

Member Function Documentation

template<class Impl >

bool DefaultRename< Impl >::block ( ThreadID tid )

private

Switches rename to blocking, and signals back that rename has become blocked.

Returns: Returns true if there is a status change.

Definition at line 854 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

int DefaultRename< Impl >::calcFreeIQEntries ( ThreadID tid )

inlineprivate

Calculates the number of free IQ entries for a specific thread.

Definition at line 1162 of file rename_impl.hh.

template<class Impl >

int DefaultRename< Impl >::calcFreeLQEntries ( ThreadID tid )

inlineprivate

Calculates the number of free LQ entries for a specific thread.

Definition at line 1174 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

int DefaultRename< Impl >::calcFreeROBEntries ( ThreadID tid )

inlineprivate

Calculates the number of free ROB entries for a specific thread.

Definition at line 1150 of file rename_impl.hh.

template<class Impl >

int DefaultRename< Impl >::calcFreeSQEntries ( ThreadID tid )

inlineprivate

Calculates the number of free SQ entries for a specific thread.

Definition at line 1186 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

bool DefaultRename< Impl >::checkSignalsAndUpdate ( ThreadID tid )

private

Checks the signals and updates the status.

Definition at line 1288 of file rename_impl.hh.

References DPRINTF, and Running.

template<class Impl >

bool DefaultRename< Impl >::checkStall ( ThreadID tid )

private

Checks if any stages are telling rename to block.

Definition at line 1226 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

void DefaultRename< Impl >::doSquash	(	const InstSeqNum &	squash_seq_num,
		ThreadID	tid
	)

private

Executes actual squash, removing squashed instructions.

Definition at line 909 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

void DefaultRename< Impl >::drainSanityCheck ( ) const

Perform sanity checks after a drain.

Definition at line 323 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::dumpHistory ( )

Debugging function used to dump history buffer of renamings.

Definition at line 1425 of file rename_impl.hh.

References cprintf().

template<class Impl >

void DefaultRename< Impl >::incrFullStat ( const FullSource & source )

inlineprivate

Function used to increment the stat that corresponds to the source of the stall.

Definition at line 1402 of file rename_impl.hh.

References panic.

template<class Impl >

bool DefaultRename< Impl >::isDrained ( ) const

Has the stage drained?

Definition at line 301 of file rename_impl.hh.

References Running.

template<class Impl >

std::string DefaultRename< Impl >::name ( ) const

Returns the name of rename.

Definition at line 85 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::readFreeEntries ( ThreadID tid )

private

Gets the number of free entries for a specific thread.

Definition at line 1258 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

void DefaultRename< Impl >::readStallSignals ( ThreadID tid )

private

Reads signals telling rename to block/unblock.

Definition at line 1212 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::regProbePoints ( )

Registers probes.

Definition at line 189 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::regStats ( )

Registers statistics.

Definition at line 92 of file rename_impl.hh.

References name(), and Stats::total.

template<class Impl >

void DefaultRename< Impl >::removeFromHistory	(	InstSeqNum	inst_seq_num,
		ThreadID	tid
	)

private

Removes a committed instruction's rename history.

Definition at line 958 of file rename_impl.hh.

References DPRINTF, and X86ISA::size().

template<class Impl >

void DefaultRename< Impl >::rename	(	bool &	status_change,
		ThreadID	tid
	)

private

Determines what to do based on rename's current status.

Parameters

status_change	rename() sets this variable if there was a status change (ie switching from blocking to unblocking).
tid	Thread id to rename instructions from.

Definition at line 450 of file rename_impl.hh.

References DPRINTF, and Running.

template<class Impl >

void DefaultRename< Impl >::renameDestRegs	(	DynInstPtr &	inst,
		ThreadID	tid
	)

inlineprivate

Renames the destination registers of an instruction.

Definition at line 1070 of file rename_impl.hh.

References AlphaISA::CC_Reg_Base, CCRegClass, DPRINTF, ThreadContext::flattenCCIndex(), ThreadContext::flattenFloatIndex(), ThreadContext::flattenIntIndex(), FloatRegClass, AlphaISA::FP_Reg_Base, IntRegClass, AlphaISA::Misc_Reg_Base, MiscRegClass, panic, regIdxToClass(), and X86ISA::size().

template<class Impl >

void DefaultRename< Impl >::renameInsts ( ThreadID tid )

private

Renames instructions for the given thread.

Also handles serializing instructions.

Definition at line 504 of file rename_impl.hh.

References DPRINTF, and Running.

template<class Impl >

void DefaultRename< Impl >::renameSrcRegs	(	DynInstPtr &	inst,
		ThreadID	tid
	)

inlineprivate

Renames the source registers of an instruction.

Definition at line 1005 of file rename_impl.hh.

References CCRegClass, DPRINTF, ThreadContext::flattenCCIndex(), ThreadContext::flattenFloatIndex(), ThreadContext::flattenIntIndex(), FloatRegClass, IntRegClass, MiscRegClass, panic, RegClassStrings, and regIdxToClass().

template<class Impl >

void DefaultRename< Impl >::resetStage ( )

private

Reset this pipeline stage.

Definition at line 241 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::serializeAfter	(	InstQueue &	inst_list,
		ThreadID	tid
	)

private

Either serializes on the next instruction available in the InstQueue, or records that it must serialize on the next instruction to enter rename.

Parameters

inst_list	The list of younger, unprocessed instructions for the thread that has the serializeAfter instruction.
tid	The thread id.

Definition at line 1388 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::setActiveThreads ( std::list< ThreadID > * at_ptr )

Sets pointer to list of active threads.

Definition at line 271 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::setCommitStage ( Commit * commit_stage )

inline

Sets pointer to commit stage.

Used only for initialization.

Definition at line 161 of file rename.hh.

References DefaultRename< Impl >::commit_ptr.

template<class Impl >

void DefaultRename< Impl >::setDecodeQueue ( TimeBuffer< DecodeStruct > * dq_ptr )

Sets pointer to time buffer coming from decode.

Definition at line 224 of file rename_impl.hh.

References TimeBuffer< T >::getWire().

template<class Impl >

void DefaultRename< Impl >::setFreeList ( FreeList * fl_ptr )

Sets pointer to the free list.

Definition at line 287 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::setIEWStage ( IEW * iew_stage )

inline

Sets pointer to IEW stage.

Used only for initialization.

Definition at line 157 of file rename.hh.

References DefaultRename< Impl >::iew_ptr.

template<class Impl >

void DefaultRename< Impl >::setRenameMap ( RenameMap rm_ptr[Impl::MaxThreads] )

Sets pointer to rename maps (per-thread structures).

Definition at line 279 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::setRenameQueue ( TimeBuffer< RenameStruct > * rq_ptr )

Sets pointer to time buffer used to communicate to the next stage.

Definition at line 214 of file rename_impl.hh.

References TimeBuffer< T >::getWire().

template<class Impl >

void DefaultRename< Impl >::setScoreboard ( Scoreboard * _scoreboard )

Sets pointer to the scoreboard.

Definition at line 294 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::setTimeBuffer ( TimeBuffer< TimeStruct > * tb_ptr )

Sets the main backwards communication time buffer pointer.

Definition at line 198 of file rename_impl.hh.

References TimeBuffer< T >::getWire().

template<class Impl >

void DefaultRename< Impl >::skidInsert ( ThreadID tid )

private

Inserts unused instructions from a given thread into the skid buffer, to be renamed once rename unblocks.

Definition at line 747 of file rename_impl.hh.

References DPRINTF, panic, X86ISA::size(), and warn.

template<class Impl >

bool DefaultRename< Impl >::skidsEmpty ( )

private

Returns if all of the skid buffers are empty.

Definition at line 798 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::sortInsts ( )

private

Separates instructions from decode into individual lists of instructions sorted by thread.

Definition at line 782 of file rename_impl.hh.

References curTick(), DTRACE, and ArmISA::i.

template<class Impl >

void DefaultRename< Impl >::squash	(	const InstSeqNum &	squash_seq_num,
		ThreadID	tid
	)

Squashes all instructions in a thread.

Definition at line 335 of file rename_impl.hh.

References DPRINTF, and ArmISA::i.

template<class Impl >

void DefaultRename< Impl >::startupStage ( )

Initializes variables for the stage.

Definition at line 234 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::takeOverFrom ( )

Takes over from another CPU's thread.

Definition at line 316 of file rename_impl.hh.

template<class Impl >

void DefaultRename< Impl >::tick ( )

Ticks rename, which processes all input signals and attempts to rename as many instructions as possible.

Definition at line 386 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

bool DefaultRename< Impl >::unblock ( ThreadID tid )

private

Switches rename to unblocking if the skid buffer is empty, and signals back that rename has unblocked.

Returns: Returns true if there is a status change.

Definition at line 888 of file rename_impl.hh.

References DPRINTF, and Running.

template<class Impl >

void DefaultRename< Impl >::updateStatus ( )

private

Updates overall rename status based on all of the threads' statuses.

Definition at line 815 of file rename_impl.hh.

References DPRINTF.

template<class Impl >

unsigned DefaultRename< Impl >::validInsts ( )

private

Returns the number of valid instructions coming from decode.

Definition at line 1198 of file rename_impl.hh.

References ArmISA::i.

Member Data Documentation

template<class Impl >

RenameStatus DefaultRename< Impl >::_status

private

Rename status.

Definition at line 119 of file rename.hh.

template<class Impl >

std::list<ThreadID>* DefaultRename< Impl >::activeThreads

private

Pointer to the list of active threads.

Definition at line 366 of file rename.hh.

template<class Impl >

bool DefaultRename< Impl >::blockThisCycle

private

Whether or not rename needs to block this cycle.

Definition at line 452 of file rename.hh.

template<class Impl >

Commit* DefaultRename< Impl >::commit_ptr

private

Pointer to commit stage.

Used only for initialization.

Definition at line 169 of file rename.hh.

Referenced by DefaultRename< Impl >::setCommitStage().

template<class Impl >

unsigned DefaultRename< Impl >::commitToRenameDelay

private

Delay between commit and rename, in ticks.

Definition at line 436 of file rename.hh.

template<class Impl >

unsigned DefaultRename< Impl >::commitWidth

private

Commit width, in instructions.

Used so rename knows how many instructions might have freed registers in the previous cycle.

Definition at line 444 of file rename.hh.

template<class Impl >

O3CPU* DefaultRename< Impl >::cpu

private

Pointer to CPU.

Definition at line 327 of file rename.hh.

template<class Impl >

TimeBuffer<DecodeStruct>* DefaultRename< Impl >::decodeQueue

private

Decode instruction queue interface.

Definition at line 348 of file rename.hh.

template<class Impl >

int DefaultRename< Impl >::decodeToRenameDelay

private

Delay between decode and rename, in ticks.

Definition at line 433 of file rename.hh.

Referenced by DefaultRename< Impl >::DefaultRename().

template<class Impl >

bool DefaultRename< Impl >::emptyROB[Impl::MaxThreads]

private

Records if the ROB is empty.

In SMT mode the ROB may be dynamically partitioned between threads, so the ROB must tell rename when it is empty.

Definition at line 410 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::fpRenameLookups

private

Definition at line 518 of file rename.hh.

template<class Impl >

FreeEntries DefaultRename< Impl >::freeEntries[Impl::MaxThreads]

private

Per-thread tracking of the number of free entries of back-end structures.

Definition at line 404 of file rename.hh.

template<class Impl >

FreeList* DefaultRename< Impl >::freeList

private

Free list interface.

Definition at line 363 of file rename.hh.

template<class Impl >

TimeBuffer<TimeStruct>::wire DefaultRename< Impl >::fromCommit

private

Wire to get commit's output from backwards time buffer.

Definition at line 336 of file rename.hh.

template<class Impl >

TimeBuffer<DecodeStruct>::wire DefaultRename< Impl >::fromDecode

private

Wire to get decode's output from decode queue.

Definition at line 351 of file rename.hh.

template<class Impl >

TimeBuffer<TimeStruct>::wire DefaultRename< Impl >::fromIEW

private

Wire to get IEW's output from backwards time buffer.

Definition at line 333 of file rename.hh.

template<class Impl >

std::list<RenameHistory> DefaultRename< Impl >::historyBuffer[Impl::MaxThreads]

private

A per-thread list of all destination register renames, used to either undo rename mappings or free old physical registers.

Definition at line 324 of file rename.hh.

template<class Impl >

IEW* DefaultRename< Impl >::iew_ptr

private

Pointer to IEW stage.

Used only for initialization.

Definition at line 166 of file rename.hh.

Referenced by DefaultRename< Impl >::setIEWStage().

template<class Impl >

int DefaultRename< Impl >::iewToRenameDelay

private

Delay between iew and rename, in ticks.

Definition at line 430 of file rename.hh.

template<class Impl >

InstQueue DefaultRename< Impl >::insts[Impl::MaxThreads]

private

Queue of all instructions coming from decode this cycle.

Definition at line 354 of file rename.hh.

template<class Impl >

int DefaultRename< Impl >::instsInProgress[Impl::MaxThreads]

private

Count of instructions in progress that have been sent off to the IQ and ROB, but are not yet included in their occupancy counts.

Definition at line 374 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::intRenameLookups

private

Definition at line 517 of file rename.hh.

template<class Impl >

int DefaultRename< Impl >::loadsInProgress[Impl::MaxThreads]

private

Count of Load instructions in progress that have been sent off to the IQ and ROB, but are not yet included in their occupancy counts.

Definition at line 379 of file rename.hh.

template<class Impl >

PhysRegIndex DefaultRename< Impl >::maxPhysicalRegs

private

Definition at line 468 of file rename.hh.

template<class Impl >

ThreadID DefaultRename< Impl >::numThreads

private

The number of threads active in rename.

Definition at line 463 of file rename.hh.

template<class Impl >

ProbePointArg<DynInstPtr>* DefaultRename< Impl >::ppRename

private

To probe when register renaming for an instruction is complete.

Definition at line 127 of file rename.hh.

template<class Impl >

ProbePointArg<SeqNumRegPair>* DefaultRename< Impl >::ppSquashInRename

private

To probe when an instruction is squashed and the register mapping for it needs to be undone.

Definition at line 132 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameBlockCycles

private

Stat for total number of cycles spent blocking.

Definition at line 491 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameCommittedMaps

private

Stat for total number of committed renaming mappings.

Definition at line 520 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renamedSerializing

private

Number of serialize instructions handled.

Definition at line 524 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renamedTempSerializing

private

Number of instructions marked as temporarily serializing.

Definition at line 526 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameFullRegistersEvents

private

Stat for total number of times that rename runs out of free registers to use to rename.

Definition at line 512 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameIdleCycles

private

Stat for total number of cycles spent idle.

Definition at line 489 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameIQFullEvents

private

Stat for total number of times that the IQ starts a stall in rename.

Definition at line 505 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameLQFullEvents

private

Stat for total number of times that the LQ starts a stall in rename.

Definition at line 507 of file rename.hh.

template<class Impl >

RenameMap* DefaultRename< Impl >::renameMap[Impl::MaxThreads]

private

Rename map interface.

Definition at line 360 of file rename.hh.

template<class Impl >

TimeBuffer<RenameStruct>* DefaultRename< Impl >::renameQueue

private

Rename instruction queue.

Definition at line 342 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameRenamedInsts

private

Stat for total number of renamed instructions.

Definition at line 499 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameRenamedOperands

private

Stat for total number of renamed destination registers.

Definition at line 514 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameRenameLookups

private

Stat for total number of source register rename lookups.

Definition at line 516 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameROBFullEvents

private

Stat for total number of times that the ROB starts a stall in rename.

Definition at line 503 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameRunCycles

private

Stat for total number of cycles spent running normally.

Definition at line 495 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameSerializeStallCycles

private

Stat for total number of cycles spent stalling for a serializing inst.

Definition at line 493 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameSkidInsts

private

Number of instructions inserted into skid buffers.

Definition at line 528 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameSQFullEvents

private

Stat for total number of times that the SQ starts a stall in rename.

Definition at line 509 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameSquashCycles

private

Stat for total number of cycles spent squashing.

Definition at line 487 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameSquashedInsts

private

Stat for total number of squashed instructions that rename discards.

Definition at line 501 of file rename.hh.

template<class Impl >

ThreadStatus DefaultRename< Impl >::renameStatus[Impl::MaxThreads]

private

Per-thread status.

Definition at line 122 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameUnblockCycles

private

Stat for total number of cycles spent unblocking.

Definition at line 497 of file rename.hh.

template<class Impl >

Stats::Scalar DefaultRename< Impl >::renameUndoneMaps

private

Stat for total number of mappings that were undone due to a squash.

Definition at line 522 of file rename.hh.

template<class Impl >

unsigned DefaultRename< Impl >::renameWidth

private

Rename width, in instructions.

Definition at line 439 of file rename.hh.

Referenced by DefaultRename< Impl >::DefaultRename().

template<class Impl >

bool DefaultRename< Impl >::resumeSerialize

private

Whether or not rename needs to resume a serialize instruction after squashing.

Definition at line 456 of file rename.hh.

template<class Impl >

bool DefaultRename< Impl >::resumeUnblocking

private

Whether or not rename needs to resume clearing out the skidbuffer after squashing.

Definition at line 460 of file rename.hh.

template<class Impl >

Scoreboard* DefaultRename< Impl >::scoreboard

private

Pointer to the scoreboard.

Definition at line 369 of file rename.hh.

template<class Impl >

DynInstPtr DefaultRename< Impl >::serializeInst[Impl::MaxThreads]

private

The serialize instruction that rename has stalled on.

Definition at line 422 of file rename.hh.

template<class Impl >

bool DefaultRename< Impl >::serializeOnNextInst[Impl::MaxThreads]

private

Records if rename needs to serialize on the next instruction for any thread.

Definition at line 427 of file rename.hh.

template<class Impl >

InstQueue DefaultRename< Impl >::skidBuffer[Impl::MaxThreads]

private

Skid buffer between rename and decode.

Definition at line 357 of file rename.hh.

template<class Impl >

unsigned DefaultRename< Impl >::skidBufferMax

private

The maximum skid buffer size.

Definition at line 466 of file rename.hh.

Referenced by DefaultRename< Impl >::DefaultRename().

template<class Impl >

Stalls DefaultRename< Impl >::stalls[Impl::MaxThreads]

private

Tracks which stages are telling decode to stall.

Definition at line 419 of file rename.hh.

template<class Impl >

int DefaultRename< Impl >::storesInProgress[Impl::MaxThreads]

private

Count of Store instructions in progress that have been sent off to the IQ and ROB, but are not yet included in their occupancy counts.

Definition at line 384 of file rename.hh.

template<class Impl >

TimeBuffer<TimeStruct>* DefaultRename< Impl >::timeBuffer

private

Pointer to main time buffer used for backwards communication.

Definition at line 330 of file rename.hh.

template<class Impl >

TimeBuffer<TimeStruct>::wire DefaultRename< Impl >::toDecode

private

Wire to write infromation heading to previous stages.

Definition at line 339 of file rename.hh.

template<class Impl >

TimeBuffer<RenameStruct>::wire DefaultRename< Impl >::toIEW

private

Wire to write any information heading to IEW.

Definition at line 345 of file rename.hh.

template<class Impl >

unsigned DefaultRename< Impl >::toIEWIndex

private

The index of the instruction in the time buffer to IEW that rename is currently using.

Definition at line 449 of file rename.hh.

template<class Impl >

bool DefaultRename< Impl >::wroteToTimeBuffer

private

Variable that tracks if decode has written to the time buffer this cycle.

Used to tell CPU if there is activity this cycle.

Definition at line 389 of file rename.hh.

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

cpu/o3/rename.hh
cpu/o3/rename_impl.hh

Classes

Public Types

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Detailed Description

template<class Impl> class DefaultRename< Impl >

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template<class Impl>
class DefaultRename< Impl >