-
Notifications
You must be signed in to change notification settings - Fork 123
/
blockpacking.h
333 lines (302 loc) · 12.1 KB
/
blockpacking.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
/**
* This code is released under the
* Apache License Version 2.0 http://www.apache.org/licenses/.
*
* (c) Daniel Lemire, http://lemire.me/en/
* and Owen Kaser
*/
#ifndef BLOCKPACKING_H_
#define BLOCKPACKING_H_
#include "codecs.h"
#include "bitpackingunaligned.h"
#include "bitpackingaligned.h"
#include "util.h"
namespace FastPForLib {
/**
* This is 32-bit *aligned* binary packing, designed from the
* ground up.
*
* For all purposes, it has performance equal to ByteAlignedPacking
* with the align template parameter set to true, but it is slightly
* more elegant.
*/
template <uint32_t MiniBlockSize> class BinaryPacking : public IntegerCODEC {
public:
static const uint32_t HowManyMiniBlocks = 16;
static const uint32_t BlockSize = HowManyMiniBlocks * MiniBlockSize;
static const uint32_t bits32 = 5; // constexprbits(32);
void encodeArray(const uint32_t *in, const size_t length, uint32_t *out,
size_t &nvalue) {
checkifdivisibleby(length, BlockSize);
const uint32_t *const initout(out);
*out++ = length;
uint32_t Bs[HowManyMiniBlocks];
for (const uint32_t *const final = in + length; in + BlockSize <= final;
in += BlockSize) {
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i)
Bs[i] = maxbits(in + i * MiniBlockSize, in + (i + 1) * MiniBlockSize);
if (HowManyMiniBlocks == 16)
out = fastpackwithoutmask_16(&Bs[0], out, bits32);
else
throw std::logic_error("unsupported HowManyMiniBlocks");
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i) {
if (MiniBlockSize == 8)
out = fastpackwithoutmask_8(in + i * MiniBlockSize, out, Bs[i]);
else if (MiniBlockSize == 16)
out = fastpackwithoutmask_16(in + i * MiniBlockSize, out, Bs[i]);
else if (MiniBlockSize == 24)
out = fastpackwithoutmask_24(in + i * MiniBlockSize, out, Bs[i]);
else if (MiniBlockSize == 32)
out = fastpackwithoutmask_32(in + i * MiniBlockSize, out, Bs[i]);
else
throw std::logic_error("unsupported MiniBlockSize");
}
}
nvalue = out - initout;
}
const uint32_t *decodeArray(const uint32_t *in, const size_t /*length*/,
uint32_t *out, size_t &nvalue) {
const uint32_t actuallength = *in++;
const uint32_t *const initout(out);
uint32_t Bs[HowManyMiniBlocks];
for (; out < initout + actuallength;) {
if (HowManyMiniBlocks == 16)
in = fastunpack_16(in, &Bs[0], bits32);
else
throw std::logic_error("unsupported HowManyMiniBlocks");
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i, out += MiniBlockSize) {
if (MiniBlockSize == 8)
in = fastunpack_8(in, out, Bs[i]);
else if (MiniBlockSize == 16)
in = fastunpack_16(in, out, Bs[i]);
else if (MiniBlockSize == 24)
in = fastunpack_24(in, out, Bs[i]);
else if (MiniBlockSize == 32)
in = fastunpack_32(in, out, Bs[i]);
else
throw std::logic_error("unsupported MiniBlockSize");
}
}
nvalue = out - initout;
return in;
}
std::string name() const {
return "BinaryPacking" + std::to_string(MiniBlockSize);
}
};
/**
* This is an attempt to make BinaryPacking faster, at the expense
* of some compression.
*/
template <uint32_t MiniBlockSize>
class FastBinaryPacking : public IntegerCODEC {
public:
using IntegerCODEC::encodeArray;
using IntegerCODEC::decodeArray;
static const uint32_t HowManyMiniBlocks = 4;
static const uint32_t BlockSize = HowManyMiniBlocks * MiniBlockSize;
static const uint32_t bits32 = 8; // 8 > gccbits(32);
void encodeArray(const uint32_t *in, const size_t length, uint32_t *out,
size_t &nvalue) override {
checkifdivisibleby(length, BlockSize);
const uint32_t *const initout(out);
*out++ = static_cast<uint32_t>(length);
uint32_t Bs[HowManyMiniBlocks];
for (const uint32_t *const final = in + length; in + BlockSize <= final;
in += BlockSize) {
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i)
Bs[i] = maxbits(in + i * MiniBlockSize, in + (i + 1) * MiniBlockSize);
*out++ = (Bs[0] << 24) | (Bs[1] << 16) | (Bs[2] << 8) | Bs[3];
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i) {
if (MiniBlockSize == 8)
out = fastpackwithoutmask_8(in + i * MiniBlockSize, out, Bs[i]);
else if (MiniBlockSize == 16)
out = fastpackwithoutmask_16(in + i * MiniBlockSize, out, Bs[i]);
else if (MiniBlockSize == 24)
out = fastpackwithoutmask_24(in + i * MiniBlockSize, out, Bs[i]);
else if (MiniBlockSize == 32) {
fastpackwithoutmask(in + i * MiniBlockSize, out, Bs[i]);
out += Bs[i];
} else
throw std::logic_error("unsupported MiniBlockSize");
}
}
nvalue = out - initout;
}
const uint32_t *decodeArray(const uint32_t *in, const size_t /*length*/,
uint32_t *out, size_t &nvalue) override {
const uint32_t actuallength = *in++;
const uint32_t *const initout(out);
uint32_t Bs[HowManyMiniBlocks];
for (; out < initout + actuallength; out += BlockSize) {
Bs[0] = static_cast<uint8_t>(in[0] >> 24);
Bs[1] = static_cast<uint8_t>(in[0] >> 16);
Bs[2] = static_cast<uint8_t>(in[0] >> 8);
Bs[3] = static_cast<uint8_t>(in[0]);
++in;
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i) {
if (MiniBlockSize == 8)
in = fastunpack_8(in, out + i * MiniBlockSize, Bs[i]);
else if (MiniBlockSize == 16)
in = fastunpack_16(in, out + i * MiniBlockSize, Bs[i]);
else if (MiniBlockSize == 24)
in = fastunpack_24(in, out + i * MiniBlockSize, Bs[i]);
else if (MiniBlockSize == 32) {
fastunpack(in, out + i * MiniBlockSize, Bs[i]);
in += Bs[i];
} else
throw std::logic_error("unsupported MiniBlockSize");
}
}
nvalue = out - initout;
return in;
}
std::string name() const override {
return "FastBinaryPacking" + std::to_string(MiniBlockSize);
}
};
// A simpler version of FastBinaryPacking32. (For sanity testing.)
class BP32 : public IntegerCODEC {
public:
using IntegerCODEC::encodeArray;
using IntegerCODEC::decodeArray;
static const uint32_t MiniBlockSize = 32;
static const uint32_t HowManyMiniBlocks = 4;
static const uint32_t BlockSize = HowManyMiniBlocks * MiniBlockSize;
void encodeArray(const uint32_t *in, const size_t length, uint32_t *out,
size_t &nvalue) override {
checkifdivisibleby(length, BlockSize);
const uint32_t *const initout(out);
*out++ = static_cast<uint32_t>(length);
uint32_t Bs[HowManyMiniBlocks];
for (const uint32_t *const final = in + length; in + BlockSize <= final;
in += BlockSize) {
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i)
Bs[i] = maxbits(in + i * MiniBlockSize, in + (i + 1) * MiniBlockSize);
*out++ = (Bs[0] << 24) | (Bs[1] << 16) | (Bs[2] << 8) | Bs[3];
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i) {
fastpackwithoutmask(in + i * MiniBlockSize, out, Bs[i]);
out += Bs[i];
}
}
nvalue = out - initout;
}
const uint32_t *decodeArray(const uint32_t *in, const size_t /*length*/,
uint32_t *out, size_t &nvalue) override {
const uint32_t actuallength = *in++;
const uint32_t *const initout(out);
uint32_t Bs[HowManyMiniBlocks];
for (; out < initout + actuallength;) {
Bs[0] = static_cast<uint8_t>(in[0] >> 24);
Bs[1] = static_cast<uint8_t>(in[0] >> 16);
Bs[2] = static_cast<uint8_t>(in[0] >> 8);
Bs[3] = static_cast<uint8_t>(in[0]);
++in;
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i, out += MiniBlockSize) {
fastunpack(in, out, Bs[i]);
in += Bs[i];
}
}
nvalue = out - initout;
return in;
}
std::string name() const override { return "BP32"; }
};
/**
* This is the original unaligned binary packing. You can
* force alignment on 32-bit boundaries with the "align" template
* parameter however.
* The packing is aligned on byte boundaries only.
*/
template <uint32_t MiniBlockSize, bool align = false, bool prescan = false>
class ByteAlignedPacking : public IntegerCODEC {
public:
static const uint32_t HowManyMiniBlocks = 16;
static const uint32_t BlockSize = HowManyMiniBlocks * MiniBlockSize;
static const uint32_t bits32 = 5; // constexprbits(32);
void encodeArray(const uint32_t *in, const size_t length, uint32_t *out,
size_t &nvalue) {
checkifdivisibleby(length, BlockSize);
const uint32_t *const initout(out);
*out++ = length;
uint8_t *outbyte = reinterpret_cast<uint8_t *>(out);
uint32_t Bs[HowManyMiniBlocks];
const uint32_t storageforbitwidth =
prescan ? bits(maxbits(in, in + length)) : bits32;
if (prescan)
*outbyte++ = storageforbitwidth;
if (MiniBlockSize == 32)
assert((storageforbitwidth * HowManyMiniBlocks) % 32 == 0);
for (const uint32_t *const final = in + length; in + BlockSize <= final;
in += BlockSize) {
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i)
Bs[i] = maxbits(in + i * MiniBlockSize, in + (i + 1) * MiniBlockSize);
if (HowManyMiniBlocks == 16)
outbyte = fastunalignedpackwithoutmask_16(&Bs[0], outbyte,
storageforbitwidth);
else
throw std::logic_error("unsupported HowManyMiniBlocks");
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i) {
if (align)
outbyte = padTo32bits(outbyte);
if (MiniBlockSize == 8)
outbyte = fastunalignedpackwithoutmask_8(in + i * MiniBlockSize,
outbyte, Bs[i]);
else if (MiniBlockSize == 16)
outbyte = fastunalignedpackwithoutmask_16(in + i * MiniBlockSize,
outbyte, Bs[i]);
else if (MiniBlockSize == 32) {
fastpackwithoutmask(in + i * MiniBlockSize,
reinterpret_cast<uint32_t *>(outbyte), Bs[i]);
outbyte += sizeof(uint32_t) * Bs[i];
} else
throw std::logic_error("unsupported MiniBlockSize");
}
}
outbyte = padTo32bits(outbyte);
const uint32_t storageinbytes =
outbyte - reinterpret_cast<const uint8_t *>(initout);
nvalue = storageinbytes / 4;
}
const uint32_t *decodeArray(const uint32_t *in, const size_t length,
uint32_t *out, size_t &nvalue) {
const uint32_t actuallength = *in++;
const uint8_t *inbyte = reinterpret_cast<const uint8_t *>(in);
const uint32_t *const initout(out);
const uint32_t storageforbitwidth = prescan ? *inbyte++ : bits32;
uint32_t Bs[HowManyMiniBlocks];
for (; out < initout + actuallength;) {
if (HowManyMiniBlocks == 16)
inbyte = fastunalignedunpack_16(inbyte, &Bs[0], storageforbitwidth);
else
throw std::logic_error("unsupported HowManyMiniBlocks");
for (uint32_t i = 0; i < HowManyMiniBlocks; ++i, out += MiniBlockSize) {
if (align)
inbyte = padTo32bits(inbyte);
if (MiniBlockSize == 8)
inbyte = fastunalignedunpack_8(inbyte, out, Bs[i]);
else if (MiniBlockSize == 16)
inbyte = fastunalignedunpack_16(inbyte, out, Bs[i]);
else if (MiniBlockSize == 32) {
fastunpack(reinterpret_cast<const uint32_t *>(inbyte), out, Bs[i]);
inbyte += sizeof(uint32_t) * Bs[i];
} else
throw std::logic_error("unsupported MiniBlockSize");
}
}
nvalue = out - initout;
return reinterpret_cast<const uint32_t *>(padTo32bits(inbyte));
}
std::string name() const {
if (!prescan && !align)
return "ByteAlignedPacking" +std::to_string(MiniBlockSize);
else if (prescan && align)
return "ByteAlignedPacking" + std::to_string(MiniBlockSize) + "<prescan,aligned>";
else if (prescan)
return "ByteAlignedPacking" + std::to_string(MiniBlockSize) + "<prescan>";
else if (align)
return "ByteAlignedPacking" + std::to_string(MiniBlockSize) + "<aligned>";
}
};
} // namespace FastPForLib
#endif /* BLOCKPACKING_H_ */