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 "base/cache/associative_cache.hh"
#include "base/circular_queue.hh"
#include "mem/cache/prefetch/queued.hh"
 
namespace gem5
{
 
struct DeltaCorrelatingPredictionTablesParams;
struct DCPTPrefetcherParams;
 
namespace prefetch
{
 
class DeltaCorrelatingPredictionTables : public SimObject
{
    const unsigned int deltaBits;
    const unsigned int deltaMaskBits;
 
    struct DCPTEntry : public CacheEntry
    {
        Addr lastAddress;
        CircularQueue<Addr> deltas;
 
        DCPTEntry(unsigned int num_deltas)
          : CacheEntry(), lastAddress(0), deltas(num_deltas)
        {
        }
 
        void invalidate() override;
 
        void addAddress(Addr address, unsigned int delta_num_bits);
 
        void getCandidates(std::vector<Queued::AddrPriority> &pfs,
                           unsigned int mask_bits) const;
 
    };
    AssociativeCache<DCPTEntry> table;
 
  public:
    DeltaCorrelatingPredictionTables(
        const DeltaCorrelatingPredictionTablesParams &p);
    ~DeltaCorrelatingPredictionTables() = default;
 
    void calculatePrefetch(const Base::PrefetchInfo &pfi,
        std::vector<Queued::AddrPriority> &addresses,
        const CacheAccessor &cache);
 
};
 
class DCPT : public Queued
{
    DeltaCorrelatingPredictionTables &dcpt;
  public:
    DCPT(const DCPTPrefetcherParams &p);
    ~DCPT() = default;
 
    void calculatePrefetch(const PrefetchInfo &pfi,
        std::vector<AddrPriority> &addresses,
        const CacheAccessor &cache) override;
};
 
} // namespace prefetch
} // namespace gem5
 
#endif//__MEM_CACHE_PREFETCH_DELTA_CORRELATING_PREDICTION_TABLES_HH_