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 "base/cache/associative_cache.hh"
#include "mem/cache/prefetch/signature_path.hh"
#include "mem/packet.hh"
 
namespace gem5
{
 
struct SignaturePathPrefetcherV2Params;
 
namespace prefetch
{
 
class SignaturePathV2 : public SignaturePath
{
    struct GlobalHistoryEntry : public TaggedEntry
    {
        signature_t signature;
        double confidence;
        stride_t lastBlock;
        stride_t delta;
        GlobalHistoryEntry(TagExtractor ext)
          : TaggedEntry(), signature(0), confidence(0.0), lastBlock(0),
            delta(0)
        {
            registerTagExtractor(ext);
        }
    };

    AssociativeCache<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 prefetch
} // namespace gem5
 
#endif//__MEM_CACHE_PREFETCH_SIGNATURE_PATH_V2_HH__