gem5  v22.0.0.1
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gem5::compression::FPC Class Reference

#include <fpc.hh>

Inheritance diagram for gem5::compression::FPC:
gem5::compression::DictionaryCompressor< uint32_t > gem5::compression::BaseDictionaryCompressor gem5::compression::Base gem5::SimObject gem5::EventManager gem5::Serializable gem5::Drainable gem5::statistics::Group gem5::Named

Classes

class  FPCCompData
 
class  RepBytes
 
class  SignExtended1Byte
 
class  SignExtended4Bits
 
class  SignExtendedHalfword
 
class  SignExtendedTwoHalfwords
 
class  Uncompressed
 
class  ZeroPaddedHalfword
 
class  ZeroRun
 

Public Types

typedef FPCParams Params
 
- Public Types inherited from gem5::compression::DictionaryCompressor< uint32_t >
typedef BaseDictionaryCompressorParams Params
 
- Public Types inherited from gem5::compression::BaseDictionaryCompressor
typedef BaseDictionaryCompressorParams Params
 
- Public Types inherited from gem5::compression::Base
typedef BaseCacheCompressorParams Params
 
- Public Types inherited from gem5::SimObject
typedef SimObjectParams Params
 

Public Member Functions

 FPC (const Params &p)
 
 ~FPC ()=default
 
- Public Member Functions inherited from gem5::compression::DictionaryCompressor< uint32_t >
 DictionaryCompressor (const Params &p)
 
 ~DictionaryCompressor ()=default
 
- Public Member Functions inherited from gem5::compression::BaseDictionaryCompressor
 BaseDictionaryCompressor (const Params &p)
 
 ~BaseDictionaryCompressor ()=default
 
- Public Member Functions inherited from gem5::compression::Base
 Base (const Params &p)
 
virtual ~Base ()=default
 
virtual void setCache (BaseCache *_cache)
 The cache can only be set once. More...
 
std::unique_ptr< CompressionDatacompress (const uint64_t *data, Cycles &comp_lat, Cycles &decomp_lat)
 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 gem5::SimObject
const Paramsparams () const
 
 SimObject (const Params &p)
 
virtual ~SimObject ()
 
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...
 
ProbeManagergetProbeManager ()
 Get the probe manager for this object. More...
 
virtual PortgetPort (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 gem5::EventManager
EventQueueeventQueue () 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)
 This function is not needed by the usual gem5 event loop but may be necessary in derived EventQueues which host gem5 on other schedulers. More...
 
void setCurTick (Tick newVal)
 
 EventManager (EventManager &em)
 Event manger manages events in the event queue. More...
 
 EventManager (EventManager *em)
 
 EventManager (EventQueue *eq)
 
- Public Member Functions inherited from gem5::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 gem5::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 gem5::statistics::Group
 Group (Group *parent, const char *name=nullptr)
 Construct a new statistics group. More...
 
virtual ~Group ()
 
virtual void regStats ()
 Callback to set stat parameters. More...
 
virtual void resetStats ()
 Callback to reset stats. More...
 
virtual void preDumpStats ()
 Callback before stats are dumped. More...
 
void addStat (statistics::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...
 
const InforesolveStat (std::string name) const
 Resolve a stat by its name within this group. More...
 
void mergeStatGroup (Group *block)
 Merge the contents (stats & children) of a block to this block. More...
 
 Group ()=delete
 
 Group (const Group &)=delete
 
Groupoperator= (const Group &)=delete
 
- Public Member Functions inherited from gem5::Named
 Named (const std::string &name_)
 
virtual ~Named ()=default
 
virtual std::string name () const
 

Private Types

enum  PatternNumber {
  ZERO_RUN, SIGN_EXTENDED_4_BITS, SIGN_EXTENDED_1_BYTE, SIGN_EXTENDED_HALFWORD,
  ZERO_PADDED_HALFWORD, SIGN_EXTENDED_TWO_HALFWORDS, REP_BYTES, UNCOMPRESSED,
  NUM_PATTERNS
}
 The possible patterns. More...
 
using DictionaryEntry = DictionaryCompressor< uint32_t >::DictionaryEntry
 

Private 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 (const DictionaryEntry data) override
 
std::unique_ptr< DictionaryCompressor::CompDatainstantiateDictionaryCompData () const override
 

Private Attributes

const int zeroRunSizeBits
 Number of bits of the zero run size bitfield. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from gem5::compression::Base
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 gem5::SimObject
static void serializeAll (const std::string &cpt_dir)
 Create a checkpoint by serializing all SimObjects in the system. More...
 
static SimObjectfind (const char *name)
 Find the SimObject with the given name and return a pointer to it. More...
 
static void setSimObjectResolver (SimObjectResolver *resolver)
 There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...
 
static SimObjectResolvergetSimObjectResolver ()
 There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...
 
- Static Public Member Functions inherited from gem5::Serializable
static const std::string & currentSection ()
 Gets the fully-qualified name of the active section. More...
 
static void generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
 Generate a checkpoint file so that the serialization can be routed to it. More...
 
- Protected Types inherited from gem5::compression::DictionaryCompressor< uint32_t >
typedef std::array< uint8_t, sizeof(uint32_t)> DictionaryEntry
 Convenience typedef for a dictionary entry. More...
 
- Protected Types inherited from gem5::compression::Base
typedef uint64_t Chunk
 A chunk is a basic lexical unit. More...
 
- Protected Member Functions inherited from gem5::compression::DictionaryCompressor< uint32_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 uint32_t data)
 Compress data. More...
 
uint32_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...
 
virtual std::unique_ptr< DictionaryCompressor::CompDatainstantiateDictionaryCompData () const
 Instantiate a compression data of the sub-class compressor. More...
 
std::unique_ptr< Base::CompressionDatacompress (const std::vector< Chunk > &chunks)
 Apply compression. More...
 
std::unique_ptr< Base::CompressionDatacompress (const std::vector< Chunk > &chunks, Cycles &comp_lat, Cycles &decomp_lat) override
 Apply the compression process to the cache line. More...
 
void decompress (const CompressionData *comp_data, uint64_t *data) override
 Apply the decompression process to the compressed data. More...
 
- Protected Member Functions inherited from gem5::compression::Base
std::vector< ChunktoChunks (const uint64_t *data) const
 This function splits the raw data into chunks, so that it can be parsed by the compressor. More...
 
void fromChunks (const std::vector< Chunk > &chunks, uint64_t *data) const
 This function re-joins the chunks to recreate the original data. More...
 
- Protected Member Functions inherited from gem5::Drainable
 Drainable ()
 
virtual ~Drainable ()
 
virtual void drainResume ()
 Resume execution after a successful drain. More...
 
void signalDrainDone () const
 Signal that an object is drained. More...
 
- Static Protected Member Functions inherited from gem5::compression::DictionaryCompressor< uint32_t >
static DictionaryEntry toDictionaryEntry (uint32_t value)
 Turn a value into a dictionary entry. More...
 
static uint32_t fromDictionaryEntry (const DictionaryEntry &entry)
 Turn a dictionary entry into a value. More...
 
- Protected Attributes inherited from gem5::compression::DictionaryCompressor< uint32_t >
std::vector< DictionaryEntrydictionary
 The dictionary. More...
 
- Protected Attributes inherited from gem5::compression::BaseDictionaryCompressor
const std::size_t dictionarySize
 Dictionary size. More...
 
std::size_t numEntries
 Number of valid entries in the dictionary. More...
 
gem5::compression::BaseDictionaryCompressor::DictionaryStats dictionaryStats
 
- Protected Attributes inherited from gem5::compression::Base
const std::size_t blkSize
 Uncompressed cache line size (in bytes). More...
 
const unsigned chunkSizeBits
 Chunk size, in number of bits. 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...
 
const Cycles compChunksPerCycle
 Degree of parallelization of the compression process. More...
 
const Cycles compExtraLatency
 Extra latency added to compression due to packaging, shifting or other operations. More...
 
const Cycles decompChunksPerCycle
 Degree of parallelization of the decompression process. More...
 
const Cycles decompExtraLatency
 Extra latency added to decompression due to packaging, shifting or other operations. More...
 
BaseCachecache
 Pointer to the parent cache. More...
 
gem5::compression::Base::BaseStats stats
 
- Protected Attributes inherited from gem5::SimObject
const SimObjectParams & _params
 Cached copy of the object parameters. More...
 
- Protected Attributes inherited from gem5::EventManager
EventQueueeventq
 A pointer to this object's event queue. More...
 

Detailed Description

Definition at line 58 of file fpc.hh.

Member Typedef Documentation

◆ DictionaryEntry

Definition at line 61 of file fpc.hh.

◆ Params

typedef FPCParams gem5::compression::FPC::Params

Definition at line 133 of file fpc.hh.

Member Enumeration Documentation

◆ PatternNumber

The possible patterns.

If a new pattern is added, it must be done before NUM_PATTERNS.

Enumerator
ZERO_RUN 
SIGN_EXTENDED_4_BITS 
SIGN_EXTENDED_1_BYTE 
SIGN_EXTENDED_HALFWORD 
ZERO_PADDED_HALFWORD 
SIGN_EXTENDED_TWO_HALFWORDS 
REP_BYTES 
UNCOMPRESSED 
NUM_PATTERNS 

Definition at line 83 of file fpc.hh.

Constructor & Destructor Documentation

◆ FPC()

gem5::compression::FPC::FPC ( const Params p)

Definition at line 81 of file fpc.cc.

◆ ~FPC()

gem5::compression::FPC::~FPC ( )
default

Member Function Documentation

◆ addToDictionary()

void gem5::compression::FPC::addToDictionary ( const DictionaryEntry  data)
overrideprivate

Definition at line 87 of file fpc.cc.

◆ getName()

std::string gem5::compression::FPC::getName ( int  number) const
inlineoverrideprivatevirtual

Get meta-name assigned to the given pattern.

Parameters
numberThe number of the pattern.
Returns
The meta-name of the pattern.

Implements gem5::compression::BaseDictionaryCompressor.

Definition at line 100 of file fpc.hh.

References REP_BYTES, SIGN_EXTENDED_1_BYTE, SIGN_EXTENDED_4_BITS, SIGN_EXTENDED_HALFWORD, SIGN_EXTENDED_TWO_HALFWORDS, UNCOMPRESSED, ZERO_PADDED_HALFWORD, and ZERO_RUN.

◆ getNumPatterns()

uint64_t gem5::compression::FPC::getNumPatterns ( ) const
inlineoverrideprivatevirtual

Trick function to get the number of patterns.

Returns
The number of defined patterns.

Implements gem5::compression::BaseDictionaryCompressor.

Definition at line 97 of file fpc.hh.

References NUM_PATTERNS.

◆ getPattern()

std::unique_ptr<Pattern> gem5::compression::FPC::getPattern ( const DictionaryEntry bytes,
const DictionaryEntry dict_bytes,
const int  match_location 
) const
inlineoverrideprivate

Definition at line 116 of file fpc.hh.

◆ instantiateDictionaryCompData()

std::unique_ptr< DictionaryCompressor< uint32_t >::CompData > gem5::compression::FPC::instantiateDictionaryCompData ( ) const
overrideprivate

Definition at line 96 of file fpc.cc.

References zeroRunSizeBits.

Member Data Documentation

◆ zeroRunSizeBits

const int gem5::compression::FPC::zeroRunSizeBits
private

Number of bits of the zero run size bitfield.

If the size of the zero run reaches the maximum value, it is split into ZERO_RUN entries.

Definition at line 95 of file fpc.hh.

Referenced by gem5::compression::FPC::FPCCompData::addEntry(), and instantiateDictionaryCompData().


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

Generated on Sat Jun 18 2022 08:13:41 for gem5 by doxygen 1.8.17