A scoreboard of register dependencies including, for each register: The number of in-flight instructions which will generate a result for this register. More...

#include <scoreboard.hh>

Inheritance diagram for Minor::Scoreboard:

Public Types
typedef TheISA::RegIndex	RegIndex
	Type to use for thread context registers. More...

typedef unsigned short int	Index
	Type to use when indexing numResults. More...

Public Member Functions
	Scoreboard (const std::string &name)

bool	findIndex (RegIndex reg, Index &scoreboard_index)
	Sets scoreboard_index to the index into numResults of the given register index. More...

void	markupInstDests (MinorDynInstPtr inst, Cycles retire_time, ThreadContext *thread_context, bool mark_unpredictable)
	Mark up an instruction's effects by incrementing numResults counts. More...

void	clearInstDests (MinorDynInstPtr inst, bool clear_unpredictable)
	Clear down the dependencies for this instruction. More...

InstSeqNum	execSeqNumToWaitFor (MinorDynInstPtr inst, ThreadContext *thread_context)
	Returns the exec sequence number of the most recent inst on which the given inst depends. More...

bool	canInstIssue (MinorDynInstPtr inst, const std::vector< Cycles > src_reg_relative_latencies, const std::vector< bool > cant_forward_from_fu_indices, Cycles now, ThreadContext *thread_context)
	Can this instruction be issued. More...

void	minorTrace () const
	MinorTraceIF interface. More...

Public Member Functions inherited from Named
	Named (const std::string &name_)

const std::string &	name () const

Public Attributes
const unsigned	numRegs
	The number of registers in the Scoreboard. More...

std::vector< Index >	numResults
	Count of the number of in-flight instructions that have results for each register. More...

std::vector< Index >	numUnpredictableResults
	Count of the number of results which can't be predicted. More...

std::vector< int >	fuIndices
	Index of the FU generating this result. More...

std::vector< Cycles >	returnCycle
	The estimated cycle number that the result will be presented. More...

std::vector< InstSeqNum >	writingInst
	The execute sequence number of the most recent inst to generate this register value. More...

Additional Inherited Members
Protected Attributes inherited from Named
const std::string	_name

Detailed Description

A scoreboard of register dependencies including, for each register: The number of in-flight instructions which will generate a result for this register.

Definition at line 59 of file scoreboard.hh.

Member Typedef Documentation

typedef unsigned short int Minor::Scoreboard::Index

Type to use when indexing numResults.

Definition at line 74 of file scoreboard.hh.

typedef TheISA::RegIndex Minor::Scoreboard::RegIndex

Type to use for thread context registers.

Definition at line 71 of file scoreboard.hh.

Constructor & Destructor Documentation

Minor::Scoreboard::Scoreboard ( const std::string & name )

inline

Definition at line 97 of file scoreboard.hh.

Member Function Documentation

bool Scoreboard::canInstIssue	(	MinorDynInstPtr	inst,
		const std::vector< Cycles > *	src_reg_relative_latencies,
		const std::vector< bool > *	cant_forward_from_fu_indices,
		Cycles	now,
		ThreadContext *	thread_context
	)

Can this instruction be issued.

Are any of its source registers due to be written by other marked-up instructions in flight

Definition at line 221 of file scoreboard.cc.

References StaticInst::disassemble(), DPRINTF, DTRACE, findIndex(), Minor::flattenRegIndex(), fuIndices, MipsISA::index, StaticInst::numSrcRegs(), numUnpredictableResults, X86ISA::reg, returnCycle, and StaticInst::srcRegIdx().

void Scoreboard::clearInstDests	(	MinorDynInstPtr	inst,
		bool	clear_unpredictable
	)

Clear down the dependencies for this instruction.

clear_unpredictable must match mark_unpredictable for the same inst.

Mark each destination register

Definition at line 186 of file scoreboard.cc.

References DPRINTF, findIndex(), fuIndices, MipsISA::index, StaticInst::numDestRegs(), numResults, numUnpredictableResults, X86ISA::reg, returnCycle, and writingInst.

InstSeqNum Scoreboard::execSeqNumToWaitFor	(	MinorDynInstPtr	inst,
		ThreadContext *	thread_context
	)

Returns the exec sequence number of the most recent inst on which the given inst depends.

Useful for determining which inst must actually be committed before a dependent inst can call initiateAcc

Definition at line 157 of file scoreboard.cc.

References DPRINTF, findIndex(), Minor::flattenRegIndex(), MipsISA::index, StaticInst::numSrcRegs(), X86ISA::reg, StaticInst::srcRegIdx(), and writingInst.

bool Scoreboard::findIndex	(	RegIndex	reg,
		Index &	scoreboard_index
	)

Sets scoreboard_index to the index into numResults of the given register index.

Returns true if the given register is in the scoreboard and false if it isn't

Definition at line 51 of file scoreboard.cc.

References CCRegClass, FloatRegClass, AlphaISA::FP_Reg_Base, IntRegClass, MiscRegClass, AlphaISA::NumCCRegs, AlphaISA::NumIntRegs, X86ISA::reg, regIdxToClass(), and AlphaISA::ZeroReg.

Referenced by canInstIssue(), clearInstDests(), execSeqNumToWaitFor(), and markupInstDests().

void Scoreboard::markupInstDests	(	MinorDynInstPtr	inst,
		Cycles	retire_time,
		ThreadContext *	thread_context,
		bool	mark_unpredictable
	)

Mark up an instruction's effects by incrementing numResults counts.

If mark_unpredictable is true, the inst's destination registers are marked as being unpredictable without an estimated retire time

Mark each destination register

Definition at line 114 of file scoreboard.cc.

References StaticInst::destRegIdx(), DPRINTF, findIndex(), Minor::flattenRegIndex(), fuIndices, MipsISA::index, StaticInst::numDestRegs(), numResults, numUnpredictableResults, X86ISA::reg, returnCycle, writingInst, and AlphaISA::ZeroReg.

void Scoreboard::minorTrace ( ) const

MinorTraceIF interface.

Definition at line 293 of file scoreboard.cc.

References ArmISA::i, MINORTRACE, numRegs, numResults, numUnpredictableResults, returnCycle, and writingInst.

Member Data Documentation

std::vector<int> Minor::Scoreboard::fuIndices

Index of the FU generating this result.

Definition at line 84 of file scoreboard.hh.

Referenced by canInstIssue(), clearInstDests(), and markupInstDests().

const unsigned Minor::Scoreboard::numRegs

The number of registers in the Scoreboard.

These are just the integer, CC and float registers packed together with integer regs in the range [0,NumIntRegs-1], CC regs in the range [NumIntRegs, NumIntRegs+NumCCRegs-1] and float regs in the range [NumIntRegs+NumCCRegs, NumFloatRegs+NumIntRegs+NumCCRegs-1]

Definition at line 68 of file scoreboard.hh.

Referenced by minorTrace().

std::vector<Index> Minor::Scoreboard::numResults

Count of the number of in-flight instructions that have results for each register.

Definition at line 78 of file scoreboard.hh.

Referenced by clearInstDests(), markupInstDests(), and minorTrace().

std::vector<Index> Minor::Scoreboard::numUnpredictableResults

Count of the number of results which can't be predicted.

Definition at line 81 of file scoreboard.hh.

Referenced by canInstIssue(), clearInstDests(), markupInstDests(), and minorTrace().

std::vector<Cycles> Minor::Scoreboard::returnCycle

The estimated cycle number that the result will be presented.

This can be offset from to allow forwarding to be simulated as long as instruction completion is strictly in order with respect to instructions with unpredictable result timing

Definition at line 90 of file scoreboard.hh.

Referenced by canInstIssue(), clearInstDests(), markupInstDests(), and minorTrace().

std::vector<InstSeqNum> Minor::Scoreboard::writingInst

The execute sequence number of the most recent inst to generate this register value.

Definition at line 94 of file scoreboard.hh.

Referenced by clearInstDests(), execSeqNumToWaitFor(), markupInstDests(), and minorTrace().

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

cpu/minor/scoreboard.hh
cpu/minor/scoreboard.cc

Public Types

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation