#include <zero.hh>

Inheritance diagram for ZeroCompressor:

Classes
class	PatternX

class	PatternZ

Public Types
typedef ZeroCompressorParams	Params

Public Types inherited from DictionaryCompressor< uint64_t >
typedef BaseDictionaryCompressorParams	Params

Public Types inherited from BaseDictionaryCompressor
typedef BaseDictionaryCompressorParams	Params

Public Types inherited from BaseCacheCompressor
typedef BaseCacheCompressorParams	Params
	Convenience typedef. More...

Public Types inherited from SimObject
typedef SimObjectParams	Params

Public Member Functions
	ZeroCompressor (const Params *p)

	~ZeroCompressor ()=default

Public Member Functions inherited from DictionaryCompressor< uint64_t >
	DictionaryCompressor (const Params *p)

	~DictionaryCompressor ()=default

Public Member Functions inherited from BaseDictionaryCompressor
	BaseDictionaryCompressor (const Params *p)

	~BaseDictionaryCompressor ()=default

void	regStats () override
	Callback to set stat parameters. More...

Public Member Functions inherited from BaseCacheCompressor
	BaseCacheCompressor (const Params *p)
	Default constructor. More...

virtual	~BaseCacheCompressor ()
	Default destructor. More...

void	compress (const uint64_t *data, Cycles &comp_lat, Cycles &decomp_lat, std::size_t &comp_size_bits)
	Apply the compression process to the cache line. More...

Cycles	getDecompressionLatency (const CacheBlk *blk)
	Get the decompression latency if the block is compressed. More...

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	regProbePoints ()
	Register probe points for this object. More...

virtual void	regProbeListeners ()
	Register probe listeners for this object. More...

ProbeManager *	getProbeManager ()
	Get the probe manager for this object. More...

virtual Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID)
	Get a port with a given name and index. 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...

Public Member Functions inherited from Stats::Group
	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

	Group (Group parent, const char name=nullptr)
	Construct a new statistics group. More...

virtual	~Group ()

virtual void	resetStats ()
	Callback to reset stats. More...

virtual void	preDumpStats ()
	Callback before stats are dumped. More...

void	addStat (Stats::Info *info)
	Register a stat with this group. More...

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object. More...

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object. More...

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block. More...

Protected Types
enum	PatternNumber { X, Z, NUM_PATTERNS }
	The patterns proposed in the paper. More...

using	DictionaryEntry = DictionaryCompressor< uint64_t >::DictionaryEntry

using	PatternFactory = Factory< PatternZ, PatternX >
	Convenience factory declaration. More...

Protected Types inherited from DictionaryCompressor< uint64_t >
typedef std::array< uint8_t, sizeof(uint64_t)>	DictionaryEntry
	Convenience typedef for a dictionary entry. More...

Protected Member Functions
uint64_t	getNumPatterns () const override
	Trick function to get the number of patterns. More...

std::string	getName (int number) const override
	Get meta-name assigned to the given pattern. More...

std::unique_ptr< Pattern >	getPattern (const DictionaryEntry &bytes, const DictionaryEntry &dict_bytes, const int match_location) const override

void	addToDictionary (DictionaryEntry data) override

std::unique_ptr< BaseCacheCompressor::CompressionData >	compress (const uint64_t *data, Cycles &comp_lat, Cycles &decomp_lat) override
	Apply the compression process to the cache line. More...

Protected Member Functions inherited from DictionaryCompressor< uint64_t >
virtual std::unique_ptr< Pattern >	getPattern (const DictionaryEntry &bytes, const DictionaryEntry &dict_bytes, const int match_location) const=0
	Since the factory cannot be instantiated here, classes that inherit from this base class have to implement the call to their factory's getPattern. More...

std::unique_ptr< Pattern >	compressValue (const uint64_t data)
	Compress data. More...

uint64_t	decompressValue (const Pattern *pattern)
	Decompress a pattern into a value that fits in a dictionary entry. More...

virtual void	resetDictionary ()
	Clear all dictionary entries. More...

virtual void	addToDictionary (const DictionaryEntry data)=0
	Add an entry to the dictionary. More...

std::unique_ptr< BaseCacheCompressor::CompressionData >	compress (const uint64_t *data)
	Apply compression. More...

void	decompress (const CompressionData comp_data, uint64_t data) override
	Decompress data. 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...

Additional Inherited Members
Static Public Member Functions inherited from BaseCacheCompressor
static void	setDecompressionLatency (CacheBlk *blk, const Cycles lat)
	Set the decompression latency of compressed block. More...

static void	setSizeBits (CacheBlk *blk, const std::size_t size_bits)
	Set the size of the compressed block, in bits. More...

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

Static Protected Member Functions inherited from DictionaryCompressor< uint64_t >
static DictionaryEntry	toDictionaryEntry (uint64_t value)
	Turn a value into a dictionary entry. More...

static uint64_t	fromDictionaryEntry (const DictionaryEntry &entry)
	Turn a dictionary entry into a value. More...

Protected Attributes inherited from DictionaryCompressor< uint64_t >
std::vector< DictionaryEntry >	dictionary
	The dictionary. More...

Protected Attributes inherited from BaseDictionaryCompressor
const std::size_t	dictionarySize
	Dictionary size. More...

std::size_t	numEntries
	Number of valid entries in the dictionary. More...

Stats::Vector	patternStats
	Number of data entries that were compressed to each pattern. More...

Protected Attributes inherited from BaseCacheCompressor
const std::size_t	blkSize
	Uncompressed cache line size (in bytes). More...

const std::size_t	sizeThreshold
	Size in bytes at which a compression is classified as bad and therefore the compressed block is restored to its uncompressed format. More...

BaseCacheCompressor::BaseCacheCompressorStats	stats

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 48 of file zero.hh.

Member Typedef Documentation

◆ DictionaryEntry

using ZeroCompressor::DictionaryEntry = DictionaryCompressor<uint64_t>::DictionaryEntry

protected

Definition at line 51 of file zero.hh.

◆ Params

typedef ZeroCompressorParams ZeroCompressor::Params

Definition at line 98 of file zero.hh.

◆ PatternFactory

using ZeroCompressor::PatternFactory = Factory<PatternZ, PatternX>

protected

Convenience factory declaration.

The templates must be organized by size, with the smallest first, and "no-match" last.

Definition at line 71 of file zero.hh.

Member Enumeration Documentation

◆ PatternNumber

enum ZeroCompressor::PatternNumber

protected

The patterns proposed in the paper.

Each letter represents a byte: Z is a null byte, M is a dictionary match, X is a new value. These are used as indexes to reference the pattern data. If a new pattern is added, it must be done before NUM_PATTERNS.

Enumerator
X
Z
NUM_PATTERNS

Definition at line 63 of file zero.hh.

Constructor & Destructor Documentation

◆ ZeroCompressor()

ZeroCompressor::ZeroCompressor ( const Params * p )

Definition at line 42 of file zero.cc.

Referenced by compress().

◆ ~ZeroCompressor()

ZeroCompressor::~ZeroCompressor ( )

default

Member Function Documentation

◆ addToDictionary()

void ZeroCompressor::addToDictionary ( DictionaryEntry data )

overrideprotected

Definition at line 48 of file zero.cc.

References data, DictionaryCompressor< uint64_t >::dictionary, BaseDictionaryCompressor::dictionarySize, and BaseDictionaryCompressor::numEntries.

Referenced by getPattern().

◆ compress()

std::unique_ptr< BaseCacheCompressor::CompressionData > ZeroCompressor::compress	(	const uint64_t *	cache_line,
		Cycles &	comp_lat,
		Cycles &	decomp_lat
	)

overrideprotectedvirtual

Apply the compression process to the cache line.

Returns the number of cycles used by the compressor, however it is usually covered by a good pipelined execution, and is currently ignored. The decompression latency is also returned, in order to avoid increasing simulation time and memory consumption.

Parameters

cache_line	The cache line to be compressed.
comp_lat	Compression latency in number of cycles.
decomp_lat	Decompression latency in number of cycles.

Returns: Cache line after compression.

Implements BaseCacheCompressor.

Definition at line 55 of file zero.cc.

References BaseCacheCompressor::blkSize, DictionaryCompressor< T >::compress(), DPRINTF, BaseDictionaryCompressor::numEntries, and ZeroCompressor().

Referenced by getPattern().

◆ getName()

std::string ZeroCompressor::getName ( int number ) const

inlineoverrideprotectedvirtual

Get meta-name assigned to the given pattern.

Parameters

number The number of the pattern.

Returns: The meta-name of the pattern.

Implements BaseDictionaryCompressor.

Definition at line 76 of file zero.hh.

References X, and Z.

◆ getNumPatterns()

uint64_t ZeroCompressor::getNumPatterns ( ) const

inlineoverrideprotectedvirtual

Trick function to get the number of patterns.

Returns: The number of defined patterns.

Implements BaseDictionaryCompressor.

Definition at line 73 of file zero.hh.

References NUM_PATTERNS.

◆ getPattern()

std::unique_ptr<Pattern> ZeroCompressor::getPattern	(	const DictionaryEntry &	bytes,
		const DictionaryEntry &	dict_bytes,
		const int	match_location
	)		const

inlineoverrideprotected

Definition at line 86 of file zero.hh.

References addToDictionary(), compress(), and data.

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

mem/cache/compressors/zero.hh
mem/cache/compressors/zero.cc

Classes

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ DictionaryEntry

◆ Params

◆ PatternFactory

Member Enumeration Documentation

◆ PatternNumber

Constructor & Destructor Documentation

◆ ZeroCompressor()

◆ ~ZeroCompressor()

Member Function Documentation

◆ addToDictionary()

◆ compress()

◆ getName()

◆ getNumPatterns()

◆ getPattern()