A pattern that compares masked values against dictionary entries. More...
#include <dictionary_compressor.hh>
Public Member Functions | |
| MaskedPattern (const int number, const uint64_t code, const uint64_t metadata_length, const int match_location, const DictionaryEntry bytes, const bool allocate=true) | |
| DictionaryEntry | decompress (const DictionaryEntry dict_bytes) const override |
| Decompress the pattern. More... | |
 Public Member Functions inherited from gem5::compression::DictionaryCompressor< T >::Pattern | |
| Pattern (const int number, const uint64_t code, const uint64_t metadata_length, const uint64_t num_unmatched_bits, const int match_location, const bool allocate=true) | |
| Default constructor. More... | |
| virtual | ~Pattern ()=default |
| Default destructor. More... | |
| int | getPatternNumber () const |
| Get enum number associated to this pattern. More... | |
| uint8_t | getCode () const |
| Get code of this pattern. More... | |
| uint8_t | getMatchLocation () const |
| Get the index of the dictionary match location. More... | |
| virtual std::size_t | getSizeBits () const |
| Get size, in bits, of the pattern (excluding prefix). More... | |
| bool | shouldAllocate () const |
| Determine if pattern allocates a dictionary entry. More... | |
| std::string | print () const |
| Extract pattern's information to a string. More... | |
Static Public Member Functions | |
| static bool | isPattern (const DictionaryEntry &bytes, const DictionaryEntry &dict_bytes, const int match_location) |
Private Attributes | |
| const T | bits |
| A copy of the bits that do not belong to the mask. More... | |
Additional Inherited Members | |
| Protected Attributes inherited from gem5::compression::DictionaryCompressor< T >::Pattern | |
| const int | patternNumber |
| Pattern enum number. More... | |
| const uint8_t | code |
| Code associated to the pattern. More... | |
| const uint8_t | length |
| Length, in bits, of the code and match location. More... | |
| const uint8_t | numUnmatchedBits |
| Number of unmatched bits. More... | |
| const int | matchLocation |
| Index representing the the match location. More... | |
| const bool | allocate |
| Wether the pattern allocates a dictionary entry or not. More... | |
Detailed Description
template<class T>
template<T mask>
class gem5::compression::DictionaryCompressor< T >::MaskedPattern< mask >
A pattern that compares masked values against dictionary entries.
If the masked dictionary entry matches perfectly the masked value to be compressed, there is a pattern match.
For example, if the mask is 0xFF00 (that is, this pattern matches the MSB), the value (V) 0xFF20 is being compressed, and the dictionary contains the value (D) 0xFF03, this is a match (V & mask == 0xFF00 == D & mask), and 0x0020 is added to the list of unmatched bits.
- Template Parameters
-
mask A mask containing the bits that must match.
Definition at line 464 of file dictionary_compressor.hh.
Constructor & Destructor Documentation
◆ MaskedPattern()
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inline |
Definition at line 475 of file dictionary_compressor.hh.
Member Function Documentation
◆ decompress()
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inlineoverridevirtual |
Decompress the pattern.
Each pattern has its own way of interpreting its data.
- Parameters
-
dict_bytes The bytes in the corresponding matching entry.
- Returns
- The decompressed pattern.
Implements gem5::compression::DictionaryCompressor< T >::Pattern.
Reimplemented in gem5::compression::DictionaryCompressor< T >::MaskedValuePattern< value, mask >, and gem5::compression::DictionaryCompressor< T >::MaskedValuePattern< 0, 0xFFFFFFFFFFFFFFFF >.
Definition at line 499 of file dictionary_compressor.hh.
References gem5::bits(), gem5::compression::DictionaryCompressor< T >::fromDictionaryEntry(), gem5::mask(), and gem5::compression::DictionaryCompressor< T >::toDictionaryEntry().
Referenced by gem5::compression::DictionaryCompressor< T >::MaskedValuePattern< value, mask >::decompress().
◆ isPattern()
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inlinestatic |
Definition at line 488 of file dictionary_compressor.hh.
References gem5::compression::DictionaryCompressor< T >::fromDictionaryEntry(), and gem5::mask().
Referenced by gem5::compression::DictionaryCompressor< T >::LocatedMaskedPattern< mask, location >::isPattern().
Member Data Documentation
◆ bits
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private |
A copy of the bits that do not belong to the mask.
Definition at line 472 of file dictionary_compressor.hh.
The documentation for this class was generated from the following file:
- mem/cache/compressors/dictionary_compressor.hh