gem5  v21.1.0.2
base_delta_impl.hh
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2019-2020 Inria
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met: redistributions of source code must retain the above copyright
8  * notice, this list of conditions and the following disclaimer;
9  * redistributions in binary form must reproduce the above copyright
10  * notice, this list of conditions and the following disclaimer in the
11  * documentation and/or other materials provided with the distribution;
12  * neither the name of the copyright holders nor the names of its
13  * contributors may be used to endorse or promote products derived from
14  * this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
33 #ifndef __MEM_CACHE_COMPRESSORS_BASE_DELTA_IMPL_HH__
34 #define __MEM_CACHE_COMPRESSORS_BASE_DELTA_IMPL_HH__
35 
36 #include "debug/CacheComp.hh"
39 
40 namespace gem5
41 {
42 
43 GEM5_DEPRECATED_NAMESPACE(Compressor, compression);
44 namespace compression
45 {
46 
47 template <class BaseType, std::size_t DeltaSizeBits>
49  : DictionaryCompressor<BaseType>(p)
50 {
51 }
52 
53 template <class BaseType, std::size_t DeltaSizeBits>
54 void
56 {
58 
59  // Add zero base for the immediate values
61 }
62 
63 template <class BaseType, std::size_t DeltaSizeBits>
64 void
66 {
71 }
72 
73 template <class BaseType, std::size_t DeltaSizeBits>
74 std::unique_ptr<Base::CompressionData>
76  const std::vector<Base::Chunk>& chunks, Cycles& comp_lat,
77  Cycles& decomp_lat)
78 {
79  std::unique_ptr<Base::CompressionData> comp_data =
80  DictionaryCompressor<BaseType>::compress(chunks, comp_lat, decomp_lat);
81 
82  // If there are more bases than the maximum, the compressor failed.
83  // Otherwise, we have to take into account all bases that have not
84  // been used, considering that there is an implicit zero base that
85  // does not need to be added to the final size.
86  const int diff = DEFAULT_MAX_NUM_BASES -
88  if (diff < 0) {
90  DPRINTF(CacheComp, "Base%dDelta%d compression failed\n",
91  8 * sizeof(BaseType), DeltaSizeBits);
92  } else if (diff > 0) {
93  comp_data->setSizeBits(comp_data->getSizeBits() +
94  8 * sizeof(BaseType) * diff);
95  }
96 
97  // Return compressed line
98  return comp_data;
99 }
100 
101 } // namespace compression
102 } // namespace gem5
103 
104 #endif //__MEM_CACHE_COMPRESSORS_BASE_DELTA_IMPL_HH__
gem5::compression::DictionaryCompressor
A template version of the dictionary compressor that allows to choose the dictionary size.
Definition: dictionary_compressor.hh:118
gem5::compression::BaseDelta
Base class for all base-delta-immediate compressors.
Definition: base_delta.hh:70
data
const char data[]
Definition: circlebuf.test.cc:48
gem5::compression::Base::Params
BaseCacheCompressorParams Params
Definition: base.hh:202
std::vector
STL vector class.
Definition: stl.hh:37
gem5::compression::BaseDelta< uint64_t, 16 >::DictionaryEntry
typename DictionaryCompressor< uint64_t >::DictionaryEntry DictionaryEntry
Definition: base_delta.hh:76
gem5::Cycles
Cycles is a wrapper class for representing cycle counts, i.e.
Definition: types.hh:78
DPRINTF
#define DPRINTF(x,...)
Definition: trace.hh:186
gem5::MipsISA::p
Bitfield< 0 > p
Definition: pra_constants.hh:326
gem5::compression::Base::setSizeBits
static void setSizeBits(CacheBlk *blk, const std::size_t size_bits)
Set the size of the compressed block, in bits.
Definition: base.cc:225
gem5::GEM5_DEPRECATED_NAMESPACE
GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi)
dictionary_compressor_impl.hh
gem5::compression::BaseDelta::BaseDelta
BaseDelta(const Params &p)
Definition: base_delta_impl.hh:48
gem5
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
Definition: decoder.cc:40
base_delta.hh

Generated on Tue Sep 21 2021 12:25:29 for gem5 by doxygen 1.8.17