89a7fb0393
Apparently we broke it with the cache rewrite and never noticed. Thanks to Bao Yungang <baoyungang@gmail.com> for a significant part of these changes (and for inspiring me to work on the rest). Some other overdue cleanup on the prefetch code too.
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/*
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* Copyright (c) 2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ron Dreslinski
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*/
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/**
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* @file
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* Describes a strided prefetcher.
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*/
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#ifndef __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__
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#define __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__
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#include <limits.h>
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#include "mem/cache/prefetch/base.hh"
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class StridePrefetcher : public BasePrefetcher
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{
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protected:
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static const int Max_Contexts = 64;
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// These constants need to be changed with the type of the
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// 'confidence' field below.
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static const int Max_Conf = INT_MAX;
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static const int Min_Conf = INT_MIN;
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class StrideEntry
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{
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public:
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Addr instAddr;
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Addr missAddr;
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int stride;
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int confidence;
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};
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Addr *lastMissAddr[Max_Contexts];
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std::list<StrideEntry*> table[Max_Contexts];
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Tick latency;
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int degree;
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bool useContextId;
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public:
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StridePrefetcher(const BaseCacheParams *p)
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: BasePrefetcher(p), latency(p->prefetch_latency),
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degree(p->prefetch_degree), useContextId(p->prefetch_use_cpu_id)
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{
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}
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~StridePrefetcher() {}
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void calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
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std::list<Tick> &delays);
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};
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#endif // __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__
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