Store buffer. More...

#include <lsq.hh>

Inheritance diagram for gem5::minor::LSQ::StoreBuffer:

Public Member Functions
	StoreBuffer (std::string name_, LSQ &lsq_, unsigned int store_buffer_size, unsigned int store_limit_per_cycle)

bool	canInsert () const
	Can a new request be inserted into the queue? More...

void	deleteRequest (LSQRequestPtr request)
	Delete the given request and free the slot it occupied. More...

void	insert (LSQRequestPtr request)
	Insert a request at the back of the queue. More...

AddrRangeCoverage	canForwardDataToLoad (LSQRequestPtr request, unsigned int &found_slot)
	Look for a store which satisfies the given load. More...

void	forwardStoreData (LSQRequestPtr load, unsigned int slot_number)
	Fill the given packet with appropriate date from slot slot_number. More...

unsigned int	numUnissuedStores ()
	Number of stores in the store buffer which have not been completely issued to the memory system. More...

void	countIssuedStore (LSQRequestPtr request)
	Count a store being issued to memory by decrementing numUnissuedAccesses. More...

bool	isDrained () const
	Drained if there is absolutely nothing left in the buffer. More...

void	step ()
	Try to issue more stores to memory. More...

void	minorTrace () const
	Report queue contents for MinorTrace. More...

Public Member Functions inherited from gem5::Named
	Named (const std::string &name_)

virtual	~Named ()=default

virtual std::string	name () const

Public Attributes
LSQ &	lsq
	My owner. More...

const unsigned int	numSlots
	Number of slots, this is a bound on the size of slots. More...

const unsigned int	storeLimitPerCycle
	Maximum number of stores that can be issued per cycle. More...

std::deque< LSQRequestPtr >	slots
	Queue of store requests on their way to memory. More...

unsigned int	numUnissuedAccesses
	Number of occupied slots which have not yet issued a memory access. More...

Detailed Description

Store buffer.

This contains stores which have been committed but whose memory transfers have not yet been issued. Load data can be forwarded out of the store buffer

Definition at line 472 of file lsq.hh.

Constructor & Destructor Documentation

◆ StoreBuffer()

gem5::minor::LSQ::StoreBuffer::StoreBuffer	(	std::string	name_,
		LSQ &	lsq_,
		unsigned int	store_buffer_size,
		unsigned int	store_limit_per_cycle
	)

Definition at line 1685 of file lsq.cc.

Member Function Documentation

◆ canForwardDataToLoad()

LSQ::AddrRangeCoverage gem5::minor::LSQ::StoreBuffer::canForwardDataToLoad	(	LSQRequestPtr	request,
		unsigned int &	found_slot
	)

Look for a store which satisfies the given load.

Returns an indication whether the forwarding request can be wholly, partly or not all all satisfied. If the request can be wholly satisfied, the store buffer slot number which can be used is returned in found_slot

Definition at line 764 of file lsq.cc.

References gem5::minor::LSQ::LSQRequest::containsAddrRangeOf(), DPRINTF, gem5::ArmISA::i, gem5::minor::LSQ::LSQRequest::inst, gem5::minor::LSQ::NoAddrRangeCoverage, gem5::minor::LSQ::LSQRequest::packet, gem5::Packet::req, and gem5::minor::LSQ::LSQRequest::request.

Referenced by gem5::minor::LSQ::tryToSendToTransfers().