91d83cc8a1
The create() method on Params structs usually instantiate SimObjects using a constructor which takes the Params struct as a parameter somehow. There has been a lot of needless variation in how that was done, making it annoying to pass Params down to base classes. Some of the different forms were: const Params & Params & Params * const Params * Params const* This change goes through and fixes up every constructor and every create() method to use the const Params & form. We use a reference because the Params struct should never be null. We use const because neither the create method nor the consuming object should modify the record of the parameters as they came in from the config. That would make consuming them not idempotent, and make it impossible to tell what the actual simulation configuration was since it would change from any user visible form (config script, config.ini, dot pdf output). Change-Id: I77453cba52fdcfd5f4eec92dfb0bddb5a9945f31 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35938 Reviewed-by: Gabe Black <gabeblack@google.com> Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Gabe Black <gabeblack@google.com> Tested-by: kokoro <noreply+kokoro@google.com>
107 lines
4.1 KiB
C++
107 lines
4.1 KiB
C++
/*
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* Copyright (c) 2019-2020 Inria
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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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/** @file
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* Implementation of a base delta immediate compressor. @see BDI
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*/
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#ifndef __MEM_CACHE_COMPRESSORS_BASE_DELTA_IMPL_HH__
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#define __MEM_CACHE_COMPRESSORS_BASE_DELTA_IMPL_HH__
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#include "debug/CacheComp.hh"
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#include "mem/cache/compressors/base_delta.hh"
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#include "mem/cache/compressors/dictionary_compressor_impl.hh"
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namespace Compressor {
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template <class BaseType, std::size_t DeltaSizeBits>
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BaseDelta<BaseType, DeltaSizeBits>::BaseDelta(const Params &p)
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: DictionaryCompressor<BaseType>(p)
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{
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}
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template <class BaseType, std::size_t DeltaSizeBits>
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void
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BaseDelta<BaseType, DeltaSizeBits>::resetDictionary()
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{
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DictionaryCompressor<BaseType>::resetDictionary();
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// Add zero base for the immediate values
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addToDictionary(DictionaryCompressor<BaseType>::toDictionaryEntry(0));
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}
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template <class BaseType, std::size_t DeltaSizeBits>
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void
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BaseDelta<BaseType, DeltaSizeBits>::addToDictionary(DictionaryEntry data)
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{
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assert(DictionaryCompressor<BaseType>::numEntries <
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DictionaryCompressor<BaseType>::dictionarySize);
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DictionaryCompressor<BaseType>::dictionary[
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DictionaryCompressor<BaseType>::numEntries++] = data;
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}
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template <class BaseType, std::size_t DeltaSizeBits>
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std::unique_ptr<Base::CompressionData>
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BaseDelta<BaseType, DeltaSizeBits>::compress(
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const std::vector<Base::Chunk>& chunks, Cycles& comp_lat,
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Cycles& decomp_lat)
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{
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std::unique_ptr<Base::CompressionData> comp_data =
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DictionaryCompressor<BaseType>::compress(chunks);
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// If there are more bases than the maximum, the compressor failed.
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// Otherwise, we have to take into account all bases that have not
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// been used, considering that there is an implicit zero base that
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// does not need to be added to the final size.
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const int diff = DEFAULT_MAX_NUM_BASES -
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DictionaryCompressor<BaseType>::numEntries;
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if (diff < 0) {
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comp_data->setSizeBits(DictionaryCompressor<BaseType>::blkSize * 8);
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DPRINTF(CacheComp, "Base%dDelta%d compression failed\n",
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8 * sizeof(BaseType), DeltaSizeBits);
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} else if (diff > 0) {
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comp_data->setSizeBits(comp_data->getSizeBits() +
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8 * sizeof(BaseType) * diff);
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}
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// Set compression latency (Assumes 1 cycle per entry and 1 cycle for
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// packing)
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comp_lat = Cycles(1 + (DictionaryCompressor<BaseType>::blkSize /
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sizeof(BaseType)));
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// Set decompression latency
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decomp_lat = Cycles(1);
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// Return compressed line
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return comp_data;
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}
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} // namespace Compressor
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#endif //__MEM_CACHE_COMPRESSORS_BASE_DELTA_IMPL_HH__
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