de408fbd4e
This namespace has gone through the deprecation period and can now be removed. Change-Id: Ibbcc8221ed6042d55f56a94bf499a4c1c564ea82 Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67354 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Richard Cooper <richard.cooper@arm.com>
84 lines
2.7 KiB
C++
84 lines
2.7 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 zero compressor, which compressed data if it is entirely
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* composed of zero bits.
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*/
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#include "mem/cache/compressors/zero.hh"
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#include "base/trace.hh"
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#include "debug/CacheComp.hh"
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#include "mem/cache/compressors/dictionary_compressor_impl.hh"
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#include "params/ZeroCompressor.hh"
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namespace gem5
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{
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namespace compression
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{
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Zero::Zero(const Params &p)
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: DictionaryCompressor<uint64_t>(p)
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{
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}
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void
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Zero::addToDictionary(DictionaryEntry data)
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{
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assert(numEntries < dictionarySize);
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dictionary[numEntries++] = data;
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}
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std::unique_ptr<Base::CompressionData>
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Zero::compress(const std::vector<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::compress(chunks);
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// If there is any non-zero entry, the compressor failed
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if (numEntries > 0) {
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comp_data->setSizeBits(blkSize * 8);
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DPRINTF(CacheComp, "Zero compression failed\n");
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}
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// Set compression latency (Assumes full line zero comparison)
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comp_lat = Cycles(1);
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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 compression
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} // namespace gem5
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