gem5  v21.1.0.2
repeated_qwords.cc
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28 
35 
36 #include "base/trace.hh"
37 #include "debug/CacheComp.hh"
39 #include "params/RepeatedQwordsCompressor.hh"
40 
41 namespace gem5
42 {
43 
44 GEM5_DEPRECATED_NAMESPACE(Compressor, compression);
45 namespace compression
46 {
47 
49  : DictionaryCompressor<uint64_t>(p)
50 {
51 }
52 
53 void
55 {
56  assert(numEntries < dictionarySize);
58 }
59 
60 std::unique_ptr<Base::CompressionData>
62  Cycles& comp_lat, Cycles& decomp_lat)
63 {
64  std::unique_ptr<Base::CompressionData> comp_data =
66 
67  // Since there is a single value repeated over and over, there should be
68  // a single dictionary entry. If there are more, the compressor failed
69  assert(numEntries >= 1);
70  if (numEntries > 1) {
71  comp_data->setSizeBits(blkSize * 8);
72  DPRINTF(CacheComp, "Repeated qwords compression failed\n");
73  }
74 
75  // Set compression latency
76  comp_lat = Cycles(1);
77 
78  // Set decompression latency
79  decomp_lat = Cycles(1);
80 
81  // Return compressed line
82  return comp_data;
83 }
84 
85 } // namespace compression
86 } // namespace gem5
gem5::compression::BaseDictionaryCompressor::dictionarySize
const std::size_t dictionarySize
Dictionary size.
Definition: dictionary_compressor.hh:72
gem5::compression::DictionaryCompressor
A template version of the dictionary compressor that allows to choose the dictionary size.
Definition: dictionary_compressor.hh:118
data
const char data[]
Definition: circlebuf.test.cc:48
gem5::compression::DictionaryCompressor< uint64_t >::dictionary
std::vector< DictionaryEntry > dictionary
The dictionary.
Definition: dictionary_compressor.hh:195
gem5::compression::Base::Params
BaseCacheCompressorParams Params
Definition: base.hh:202
std::vector< Chunk >
gem5::compression::Base::blkSize
const std::size_t blkSize
Uncompressed cache line size (in bytes).
Definition: base.hh:94
gem5::compression::DictionaryCompressor::compress
std::unique_ptr< Base::CompressionData > compress(const std::vector< Chunk > &chunks)
Apply compression.
Definition: dictionary_compressor_impl.hh:131
gem5::compression::RepeatedQwords::addToDictionary
void addToDictionary(DictionaryEntry data) override
Definition: repeated_qwords.cc:54
gem5::Cycles
Cycles is a wrapper class for representing cycle counts, i.e.
Definition: types.hh:78
gem5::compression::RepeatedQwords::DictionaryEntry
DictionaryCompressor< uint64_t >::DictionaryEntry DictionaryEntry
Definition: repeated_qwords.hh:56
repeated_qwords.hh
gem5::compression::RepeatedQwords::RepeatedQwords
RepeatedQwords(const Params &p)
Definition: repeated_qwords.cc:48
DPRINTF
#define DPRINTF(x,...)
Definition: trace.hh:186
gem5::MipsISA::p
Bitfield< 0 > p
Definition: pra_constants.hh:326
gem5::compression::BaseDictionaryCompressor::numEntries
std::size_t numEntries
Number of valid entries in the dictionary.
Definition: dictionary_compressor.hh:75
gem5::GEM5_DEPRECATED_NAMESPACE
GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi)
gem5::compression::RepeatedQwords::compress
std::unique_ptr< Base::CompressionData > compress(const std::vector< Base::Chunk > &chunks, Cycles &comp_lat, Cycles &decomp_lat) override
Apply the compression process to the cache line.
Definition: repeated_qwords.cc:61
dictionary_compressor_impl.hh
trace.hh
gem5
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
Definition: decoder.cc:40

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