dictionary_compressor.hh File Reference

Definition of a dictionary based cache compressor. More...

#include <array>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <type_traits>
#include <vector>
#include "base/bitfield.hh"
#include "base/statistics.hh"
#include "base/types.hh"
#include "mem/cache/compressors/base.hh"

Go to the source code of this file.

Classes
class	gem5::compression::BaseDictionaryCompressor
struct	gem5::compression::BaseDictionaryCompressor::DictionaryStats
class	gem5::compression::DictionaryCompressor< T >
	A template version of the dictionary compressor that allows to choose the dictionary size. More...
struct	gem5::compression::DictionaryCompressor< T >::Factory< Head, Tail >
	Create a factory to determine if input matches a pattern. More...
struct	gem5::compression::DictionaryCompressor< T >::Factory< Head >
	Specialization to end the recursion. More...
class	gem5::compression::DictionaryCompressor< T >::Pattern
	The compressed data is composed of multiple pattern entries. More...
class	gem5::compression::DictionaryCompressor< T >::CompData
class	gem5::compression::DictionaryCompressor< T >::UncompressedPattern
	A pattern containing the original uncompressed data. More...
class	gem5::compression::DictionaryCompressor< T >::MaskedPattern< mask >
	A pattern that compares masked values against dictionary entries. More...
class	gem5::compression::DictionaryCompressor< T >::MaskedValuePattern< value, mask >
	A pattern that compares masked values to a masked portion of a fixed value. More...
class	gem5::compression::DictionaryCompressor< T >::LocatedMaskedPattern< mask, location >
	A pattern that narrows the MaskedPattern by allowing a only single possible dictionary entry to be matched against. More...
class	gem5::compression::DictionaryCompressor< T >::RepeatedValuePattern< RepT >
	A pattern that checks if dictionary entry sized values are solely composed of multiple copies of a single value. More...
class	gem5::compression::DictionaryCompressor< T >::DeltaPattern< DeltaSizeBits >
	A pattern that checks whether the difference of the value and the dictionary entries' is below a certain threshold. More...
class	gem5::compression::DictionaryCompressor< T >::SignExtendedPattern< N >
	A pattern that checks whether the value is an N bits sign-extended value, that is, all the MSB starting from the Nth are equal to the (N-1)th bit. More...

Namespaces
	gem5
	Reference material can be found at the JEDEC website: UFS standard http://www.jedec.org/standards-documents/results/jesd220 UFS HCI specification http://www.jedec.org/standards-documents/results/jesd223.
	gem5::compression

Functions
	gem5::GEM5_DEPRECATED_NAMESPACE (Compressor, compression)

Detailed Description

Definition of a dictionary based cache compressor.

Each entry is compared against a dictionary to search for matches.

The dictionary is composed of 32-bit entries, and the comparison is done byte per byte.

The patterns are implemented as individual classes that have a checking function isPattern(), to determine if the data fits the pattern, and a decompress() function, which decompresses the contents of a pattern. Every new pattern must inherit from the Pattern class and be added to the patternFactory.

Definition in file dictionary_compressor.hh.