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/*
* Copyright (c) 2005 The Regents of The University of Michigan
* All rights reserved.
*
* 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
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* 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
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ron Dreslinski
*/
/**
* @file
* Describes a strided prefetcher.
*/
#ifndef __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__
#define __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__
#include <limits.h>
#include "mem/cache/prefetch/base.hh"
class StridePrefetcher : public BasePrefetcher
{
protected:
static const int Max_Contexts = 64;
// These constants need to be changed with the type of the
// 'confidence' field below.
static const int Max_Conf = INT_MAX;
static const int Min_Conf = INT_MIN;
class StrideEntry
{
public:
Addr instAddr;
Addr missAddr;
int stride;
int confidence;
};
Addr *lastMissAddr[Max_Contexts];
std::list<StrideEntry*> table[Max_Contexts];
Tick latency;
int degree;
bool useContextId;
public:
StridePrefetcher(const BaseCacheParams *p)
: BasePrefetcher(p), latency(p->prefetch_latency),
degree(p->prefetch_degree), useContextId(p->prefetch_use_cpu_id)
{
}
~StridePrefetcher() {}
void calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
std::list<Tick> &delays);
};
#endif // __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__
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