delta_correlating_prediction_tables.hh

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#ifndef __MEM_CACHE_PREFETCH_DELTA_CORRELATING_PREDICTION_TABLES_HH_
#define __MEM_CACHE_PREFETCH_DELTA_CORRELATING_PREDICTION_TABLES_HH_

#include "mem/cache/prefetch/associative_set.hh"
#include "mem/cache/prefetch/queued.hh"

struct DeltaCorrelatingPredictionTablesParams;

class DeltaCorrelatingPredictionTables : public SimObject
{
    const unsigned int deltaBits;
    const unsigned int deltaMaskBits;

    struct DCPTEntry : public TaggedEntry
    {
        Addr lastAddress;
        unsigned int deltaPointer;
        std::vector<Addr> deltas;

        DCPTEntry(unsigned int num_deltas)
          : TaggedEntry(), lastAddress(0), deltaPointer(0), deltas(num_deltas)
        {
        }

        void invalidate() override;

        void addAddress(Addr address, unsigned int delta_num_bits);

        void getCandidates(std::vector<QueuedPrefetcher::AddrPriority> &pfs,
                           unsigned int mask_bits) const;

    };
    AssociativeSet<DCPTEntry> table;

  public:
    DeltaCorrelatingPredictionTables(
        DeltaCorrelatingPredictionTablesParams *p);
    ~DeltaCorrelatingPredictionTables()
    {}

    void calculatePrefetch(const BasePrefetcher::PrefetchInfo &pfi,
        std::vector<QueuedPrefetcher::AddrPriority> &addresses);

};

struct DCPTPrefetcherParams;

class DCPTPrefetcher : public QueuedPrefetcher
{
    DeltaCorrelatingPredictionTables &dcpt;
  public:
    DCPTPrefetcher(const DCPTPrefetcherParams *p);
    ~DCPTPrefetcher()
    {}
    void calculatePrefetch(const PrefetchInfo &pfi,
        std::vector<AddrPriority> &addresses) override;
};
#endif//__MEM_CACHE_PREFETCH_DELTA_CORRELATING_PREDICTION_TABLES_HH_