base.cc (13942:e8b59b523af6) base.cc (13943:4046b0c547be)
1/*
2 * Copyright (c) 2018 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;

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31/** @file
32 * Definition of a basic cache compressor.
33 */
34
35#include "mem/cache/compressors/base.hh"
36
37#include <algorithm>
38#include <cstdint>
1/*
2 * Copyright (c) 2018 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;

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31/** @file
32 * Definition of a basic cache compressor.
33 */
34
35#include "mem/cache/compressors/base.hh"
36
37#include <algorithm>
38#include <cstdint>
39#include <string>
39
40#include "debug/CacheComp.hh"
41#include "mem/cache/tags/super_blk.hh"
42#include "params/BaseCacheCompressor.hh"
43
44// Uncomment this line if debugging compression
45//#define DEBUG_COMPRESSION
46

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95 // Check if decompressed line matches original cache line
96 fatal_if(std::memcmp(data, decomp_data, blkSize),
97 "Decompressed line does not match original line.");
98 #endif
99
100 // Get compression size
101 comp_size_bits = comp_data->getSizeBits();
102
40
41#include "debug/CacheComp.hh"
42#include "mem/cache/tags/super_blk.hh"
43#include "params/BaseCacheCompressor.hh"
44
45// Uncomment this line if debugging compression
46//#define DEBUG_COMPRESSION
47

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96 // Check if decompressed line matches original cache line
97 fatal_if(std::memcmp(data, decomp_data, blkSize),
98 "Decompressed line does not match original line.");
99 #endif
100
101 // Get compression size
102 comp_size_bits = comp_data->getSizeBits();
103
104 // Update stats
105 compressionSize[std::ceil(std::log2(comp_size_bits))]++;
106
103 // Print debug information
104 DPRINTF(CacheComp, "Compressed cache line from %d to %d bits. " \
105 "Compression latency: %llu, decompression latency: %llu\n",
106 blkSize*8, comp_size_bits, comp_lat, decomp_lat);
107}
108
109Cycles
110BaseCacheCompressor::getDecompressionLatency(const CacheBlk* blk)

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135{
136 // Sanity check
137 assert(blk != nullptr);
138
139 // Assign size
140 static_cast<CompressionBlk*>(blk)->setSizeBits(size_bits);
141}
142
107 // Print debug information
108 DPRINTF(CacheComp, "Compressed cache line from %d to %d bits. " \
109 "Compression latency: %llu, decompression latency: %llu\n",
110 blkSize*8, comp_size_bits, comp_lat, decomp_lat);
111}
112
113Cycles
114BaseCacheCompressor::getDecompressionLatency(const CacheBlk* blk)

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139{
140 // Sanity check
141 assert(blk != nullptr);
142
143 // Assign size
144 static_cast<CompressionBlk*>(blk)->setSizeBits(size_bits);
145}
146
147void
148BaseCacheCompressor::regStats()
149{
150 SimObject::regStats();
151
152 // We also store when compression is bigger than original block size
153 compressionSize
154 .init(std::log2(blkSize*8) + 2)
155 .name(name() + ".compression_size")
156 .desc("Number of blocks that were compressed to this power of" \
157 "two size.")
158 ;
159
160 for (unsigned i = 0; i <= std::log2(blkSize*8) + 1; ++i) {
161 compressionSize.subname(i, std::to_string(1 << i));
162 compressionSize.subdesc(i, "Number of blocks that compressed to fit " \
163 "in " + std::to_string(1 << i) + " bits");
164 }
165}
166