signature_path_v2.hh

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#ifndef __MEM_CACHE_PREFETCH_SIGNATURE_PATH_V2_HH__
#define __MEM_CACHE_PREFETCH_SIGNATURE_PATH_V2_HH__

#include "mem/cache/prefetch/associative_set.hh"
#include "mem/cache/prefetch/signature_path.hh"
#include "mem/packet.hh"

struct SignaturePathPrefetcherV2Params;

namespace Prefetcher {

class SignaturePathV2 : public SignaturePath
{
    struct GlobalHistoryEntry : public TaggedEntry
    {
        signature_t signature;
        double confidence;
        stride_t lastBlock;
        stride_t delta;
        GlobalHistoryEntry() : signature(0), confidence(0.0), lastBlock(0),
                               delta(0) {}
    };
    AssociativeSet<GlobalHistoryEntry> globalHistoryRegister;

    double calculateLookaheadConfidence(PatternEntry const &sig,
            PatternStrideEntry const &lookahead) const override;

    double calculatePrefetchConfidence(PatternEntry const &sig,
            PatternStrideEntry const &lookahead) const override;

    void increasePatternEntryCounter(PatternEntry &pattern_entry,
            PatternStrideEntry &pstride_entry) override;

    void handleSignatureTableMiss(stride_t current_block,
            signature_t &new_signature, double &new_conf,
            stride_t &new_stride) override;

    void auxiliaryPrefetcher(Addr ppn, stride_t current_block, bool is_secure,
            std::vector<AddrPriority> &addresses) override
    {}

    virtual void handlePageCrossingLookahead(signature_t signature,
            stride_t last_offset, stride_t delta, double path_confidence)
            override;

  public:
    SignaturePathV2(const SignaturePathPrefetcherV2Params* p);
    ~SignaturePathV2() = default;
};

} // namespace Prefetcher

#endif//__MEM_CACHE_PREFETCH_SIGNATURE_PATH_V2_HH__