multi.hh

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/*
 * Copyright (c) 2019 Inria
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * Authors: Daniel Carvalho
 */

#ifndef __MEM_CACHE_COMPRESSORS_MULTI_HH__
#define __MEM_CACHE_COMPRESSORS_MULTI_HH__

#include <cstdint>
#include <vector>

#include "base/types.hh"
#include "mem/cache/compressors/base.hh"

struct MultiCompressorParams;

class MultiCompressor : public BaseCacheCompressor
{
  protected:
    class MultiCompData;

    std::vector<BaseCacheCompressor*> compressors;

    Stats::Vector2d rankStats;

  public:
     typedef MultiCompressorParams Params;

    MultiCompressor(const Params *p);

    ~MultiCompressor();

    void regStats() override;

    std::unique_ptr<BaseCacheCompressor::CompressionData> compress(
        const uint64_t* data, Cycles& comp_lat, Cycles& decomp_lat) override;

    void decompress(const CompressionData* comp_data, uint64_t* data) override;
};

class MultiCompressor::MultiCompData : public CompressionData
{
  private:
    const uint8_t index;

  public:
    std::unique_ptr<BaseCacheCompressor::CompressionData> compData;

    MultiCompData(unsigned index,
        std::unique_ptr<BaseCacheCompressor::CompressionData> comp_data);

    ~MultiCompData() = default;

    uint8_t getIndex() const;
};

#endif //__MEM_CACHE_COMPRESSORS_MULTI_HH__