cpack.hh

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 * Copyright (c) 2018-2020 Inria
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 * met: redistributions of source code must retain the above copyright
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 * neither the name of the copyright holders nor the names of its
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#ifndef __MEM_CACHE_COMPRESSORS_CPACK_HH__
#define __MEM_CACHE_COMPRESSORS_CPACK_HH__
 
#include <cstdint>
#include <map>
#include <memory>
 
#include "base/types.hh"
#include "mem/cache/compressors/dictionary_compressor.hh"
 
namespace gem5
{
 
struct CPackParams;
 
namespace compression
{
 
class CPack : public DictionaryCompressor<uint32_t>
{
  private:
    using DictionaryEntry = DictionaryCompressor<uint32_t>::DictionaryEntry;
 
    // Forward declaration of all possible patterns
    class PatternZZZZ;
    class PatternXXXX;
    class PatternMMMM;
    class PatternMMXX;
    class PatternZZZX;
    class PatternMMMX;
 
    enum PatternNumber
    {
        ZZZZ, XXXX, MMMM, MMXX, ZZZX, MMMX, NUM_PATTERNS
    };
 
    using PatternFactory = Factory<PatternZZZZ, PatternMMMM, PatternZZZX,
                                   PatternMMMX, PatternMMXX, PatternXXXX>;
 
    uint64_t getNumPatterns() const override { return NUM_PATTERNS; }
 
    std::string
    getName(int number) const override
    {
        static std::map<int, std::string> patternNames = {
            {ZZZZ, "ZZZZ"}, {XXXX, "XXXX"}, {MMMM, "MMMM"},
            {MMXX, "MMXX"}, {ZZZX, "ZZZX"}, {MMMX, "MMMX"}
        };
 
        return patternNames[number];
    };
 
    std::unique_ptr<Pattern> getPattern(
        const DictionaryEntry& bytes,
        const DictionaryEntry& dict_bytes,
        const int match_location) const override
    {
        return PatternFactory::getPattern(bytes, dict_bytes, match_location);
    }
 
    void addToDictionary(DictionaryEntry data) override;
 
  public:
     typedef CPackParams Params;
 
    CPack(const Params &p);
 
    ~CPack() {};
};
 
class CPack::PatternZZZZ : public MaskedValuePattern<0, 0xFFFFFFFF>
{
  public:
    PatternZZZZ(const DictionaryEntry bytes, const int match_location)
        : MaskedValuePattern<0, 0xFFFFFFFF>(ZZZZ, 0x0, 2, match_location,
          bytes)
    {
    }
};
 
class CPack::PatternXXXX : public UncompressedPattern
{
  public:
    PatternXXXX(const DictionaryEntry bytes, const int match_location)
        : UncompressedPattern(XXXX, 0x1, 2, match_location, bytes)
    {
    }
};
 
class CPack::PatternMMMM : public MaskedPattern<0xFFFFFFFF>
{
  public:
    PatternMMMM(const DictionaryEntry bytes, const int match_location)
        : MaskedPattern<0xFFFFFFFF>(MMMM, 0x2, 6, match_location, bytes, true)
    {
    }
};
 
class CPack::PatternMMXX : public MaskedPattern<0xFFFF0000>
{
  public:
    PatternMMXX(const DictionaryEntry bytes, const int match_location)
        : MaskedPattern<0xFFFF0000>(MMXX, 0xC, 8, match_location, bytes, true)
    {
    }
};
 
class CPack::PatternZZZX : public MaskedValuePattern<0, 0xFFFFFF00>
{
  public:
    PatternZZZX(const DictionaryEntry bytes, const int match_location)
        : MaskedValuePattern<0, 0xFFFFFF00>(ZZZX, 0xD, 4, match_location,
          bytes)
    {
    }
};
 
class CPack::PatternMMMX : public MaskedPattern<0xFFFFFF00>
{
  public:
    PatternMMMX(const DictionaryEntry bytes, const int match_location)
        : MaskedPattern<0xFFFFFF00>(MMMX, 0xE, 8, match_location, bytes, true)
    {
    }
};
 
} // namespace compression
} // namespace gem5
 
#endif //__MEM_CACHE_COMPRESSORS_CPACK_HH__