gem5::minor::Decode Class Reference

#include <decode.hh>

Inheritance diagram for gem5::minor::Decode:

Classes
struct	DecodeThreadInfo
	Data members after this line are cycle-to-cycle state. More...

Public Member Functions
	Decode (const std::string &name, MinorCPU &cpu_, const BaseMinorCPUParams &params, Latch< ForwardInstData >::Output inp_, Latch< ForwardInstData >::Input out_, std::vector< InputBuffer< ForwardInstData > > &next_stage_input_buffer)
void	evaluate ()
	Pass on input/buffer data to the output if you can.
void	minorTrace () const
bool	isDrained ()
	Is this stage drained?
Public Member Functions inherited from gem5::Named
	Named (std::string_view name_)
virtual	~Named ()=default
virtual std::string	name () const

Public Attributes
std::vector< InputBuffer< ForwardInstData > >	inputBuffer

Protected Member Functions
const ForwardInstData *	getInput (ThreadID tid)
	Get a piece of data to work on, or 0 if there is no data.
void	popInput (ThreadID tid)
	Pop an element off the input buffer, if there are any.
ThreadID	getScheduledThread ()
	Use the current threading policy to determine the next thread to decode from.

Protected Attributes
MinorCPU &	cpu
	Pointer back to the containing CPU.
Latch< ForwardInstData >::Output	inp
	Input port carrying macro instructions from Fetch2.
Latch< ForwardInstData >::Input	out
	Output port carrying micro-op decomposed instructions to Execute.
std::vector< InputBuffer< ForwardInstData > > &	nextStageReserve
	Interface to reserve space in the next stage.
unsigned int	outputWidth
	Width of output of this stage/input of next in instructions.
bool	processMoreThanOneInput
	If true, more than one input word can be processed each cycle if there is room in the output to contain its processed data.
std::vector< DecodeThreadInfo >	decodeInfo
ThreadID	threadPriority

Detailed Description

Definition at line 66 of file decode.hh.

Constructor & Destructor Documentation

Decode()

gem5::minor::Decode::Decode	(	const std::string &	name,
		MinorCPU &	cpu_,
		const BaseMinorCPUParams &	params,
		Latch< ForwardInstData >::Output	inp_,
		Latch< ForwardInstData >::Input	out_,
		std::vector< InputBuffer< ForwardInstData > > &	next_stage_input_buffer )

Definition at line 51 of file decode.cc.

References cpu, decodeInfo, fatal, inp, inputBuffer, gem5::Named::name(), gem5::Named::Named(), nextStageReserve, out, outputWidth, processMoreThanOneInput, and threadPriority.

Referenced by evaluate().

Member Function Documentation

evaluate()

void gem5::minor::Decode::evaluate

(

)

Pass on input/buffer data to the output if you can.

Definition at line 127 of file decode.cc.

References gem5::StaticInst::advancePC(), cpu, Decode(), decodeInfo, gem5::minor::Pipeline::DecodeStageId, DPRINTF, gem5::minor::Decode::DecodeThreadInfo::execSeqNum, gem5::StaticInst::fetchMicroop(), getInput(), getScheduledThread(), gem5::ArmISA::i, gem5::minor::Decode::DecodeThreadInfo::inMacroop, inp, inputBuffer, gem5::minor::Decode::DecodeThreadInfo::inputIndex, gem5::minor::ForwardInstData::insts, gem5::InvalidThreadID, gem5::minor::ForwardInstData::isBubble(), gem5::StaticInst::isLastMicroop(), gem5::StaticInst::isMacroop(), gem5::minor::Decode::DecodeThreadInfo::microopPC, nextStageReserve, gem5::NoFault, out, outputWidth, popInput(), processMoreThanOneInput, gem5::minor::ForwardInstData::resize(), gem5::ArmISA::set, gem5::minor::ForwardInstData::threadId, and gem5::minor::ForwardInstData::width().

getInput()

const ForwardInstData * gem5::minor::Decode::getInput ( ThreadID tid )

protected

Get a piece of data to work on, or 0 if there is no data.

Definition at line 85 of file decode.cc.

References inputBuffer, and gem5::minor::ForwardInstData::isBubble().

Referenced by evaluate(), and getScheduledThread().

getScheduledThread()

ThreadID gem5::minor::Decode::getScheduledThread ( )

inlineprotected

Use the current threading policy to determine the next thread to decode from.

Definition at line 300 of file decode.cc.

References cpu, decodeInfo, getInput(), gem5::InvalidThreadID, panic, and threadPriority.

Referenced by evaluate().

isDrained()

bool gem5::minor::Decode::isDrained

(

)

Is this stage drained?

For Decoed, draining is initiated by Execute halting Fetch1 causing Fetch2 to naturally drain into Decode and on to Execute which is responsible for actually killing instructions

Definition at line 330 of file decode.cc.

References inp, and inputBuffer.

minorTrace()

void gem5::minor::Decode::minorTrace

(

)

const

Definition at line 341 of file decode.cc.

References data, decodeInfo, inputBuffer, gem5::minor::minorTrace(), and out.

popInput()

void gem5::minor::Decode::popInput ( ThreadID tid )

protected

Pop an element off the input buffer, if there are any.

Definition at line 98 of file decode.cc.

References decodeInfo, and inputBuffer.

Referenced by evaluate().

Member Data Documentation

cpu

MinorCPU& gem5::minor::Decode::cpu

protected

Pointer back to the containing CPU.

Definition at line 70 of file decode.hh.

Referenced by Decode(), evaluate(), and getScheduledThread().

decodeInfo

std::vector<DecodeThreadInfo> gem5::minor::Decode::decodeInfo

protected

Definition at line 127 of file decode.hh.

Referenced by Decode(), evaluate(), getScheduledThread(), minorTrace(), and popInput().

inp

Latch<ForwardInstData>::Output gem5::minor::Decode::inp

protected

Input port carrying macro instructions from Fetch2.

Definition at line 73 of file decode.hh.

Referenced by Decode(), evaluate(), and isDrained().

inputBuffer

std::vector<InputBuffer<ForwardInstData> > gem5::minor::Decode::inputBuffer

Definition at line 89 of file decode.hh.

Referenced by Decode(), evaluate(), getInput(), isDrained(), minorTrace(), and popInput().

nextStageReserve

std::vector<InputBuffer<ForwardInstData> >& gem5::minor::Decode::nextStageReserve

protected

Interface to reserve space in the next stage.

Definition at line 78 of file decode.hh.

Referenced by Decode(), and evaluate().

out

Latch<ForwardInstData>::Input gem5::minor::Decode::out

protected

Output port carrying micro-op decomposed instructions to Execute.

Definition at line 75 of file decode.hh.

Referenced by Decode(), evaluate(), and minorTrace().

outputWidth

unsigned int gem5::minor::Decode::outputWidth

protected

Width of output of this stage/input of next in instructions.

Definition at line 81 of file decode.hh.

Referenced by Decode(), and evaluate().

processMoreThanOneInput

bool gem5::minor::Decode::processMoreThanOneInput

protected

If true, more than one input word can be processed each cycle if there is room in the output to contain its processed data.

Definition at line 85 of file decode.hh.

Referenced by Decode(), and evaluate().

threadPriority

ThreadID gem5::minor::Decode::threadPriority

protected

Definition at line 128 of file decode.hh.

Referenced by Decode(), and getScheduledThread().

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

• cpu/minor/decode.hh
• cpu/minor/decode.cc