v8 147.4.0

Rust bindings to V8
Documentation 
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

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <cstdint>
#include <cstdio>
#include <ctime>
#include <iostream>  // cerr
#include <random>
#include <vector>

// clang-format off
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "hwy/contrib/random/random_test.cc"  // NOLINT
#include "hwy/foreach_target.h"  // IWYU pragma: keep
#include "hwy/highway.h"
#include "hwy/contrib/random/random-inl.h"
#include "hwy/tests/test_util-inl.h"
// clang-format on

HWY_BEFORE_NAMESPACE();
namespace hwy {
namespace HWY_NAMESPACE {  // required: unique per target
namespace {

constexpr std::uint64_t tests = 1UL << 10;

std::uint64_t GetSeed() { return static_cast<uint64_t>(std::time(nullptr)); }

void RngLoop(const std::uint64_t seed, std::uint64_t* HWY_RESTRICT result,
             const size_t size) {
  const ScalableTag<std::uint64_t> d;
  VectorXoshiro generator{seed};
  for (size_t i = 0; i < size; i += Lanes(d)) {
    Store(generator(), d, result + i);
  }
}

#if HWY_HAVE_FLOAT64
void UniformLoop(const std::uint64_t seed, double* HWY_RESTRICT result,
                 const size_t size) {
  const ScalableTag<double> d;
  VectorXoshiro generator{seed};
  for (size_t i = 0; i < size; i += Lanes(d)) {
    Store(generator.Uniform(), d, result + i);
  }
}
#endif

void TestSeeding() {
  const std::uint64_t seed = GetSeed();
  VectorXoshiro generator{seed};
  internal::Xoshiro reference{seed};
  const auto& state = generator.GetState();
  const ScalableTag<std::uint64_t> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 0UL; i < lanes; ++i) {
    const auto& reference_state = reference.GetState();
    for (std::size_t j = 0UL; j < reference_state.size(); ++j) {
      if (state[{j}][i] != reference_state[j]) {
        std::cerr << "SEED: " << seed << "\n";
        std::cerr << "TEST SEEDING ERROR: ";
        std::cerr << "state[" << j << "][" << i << "] -> " << state[{j}][i]
                  << " != " << reference_state[j] << "\n";
        HWY_ASSERT(0);
      }
    }
    reference.Jump();
  }
}

void TestMultiThreadSeeding() {
  const std::uint64_t seed = GetSeed();
  const std::uint64_t threadId = std::random_device()() % 1000;
  VectorXoshiro generator{seed, threadId};
  internal::Xoshiro reference{seed};

  for (std::size_t i = 0UL; i < threadId; ++i) {
    reference.LongJump();
  }

  const auto& state = generator.GetState();
  const ScalableTag<std::uint64_t> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 0UL; i < lanes; ++i) {
    const auto& reference_state = reference.GetState();
    for (std::size_t j = 0UL; j < reference_state.size(); ++j) {
      if (state[{j}][i] != reference_state[j]) {
        std::cerr << "SEED: " << seed << std::endl;
        std::cerr << "TEST SEEDING ERROR: ";
        std::cerr << "state[" << j << "][" << i << "] -> " << state[{j}][i]
                  << " != " << reference_state[j] << "\n";
        HWY_ASSERT(0);
      }
    }
    reference.Jump();
  }
}

void TestRandomUint64() {
  const std::uint64_t seed = GetSeed();
  const auto result_array = hwy::MakeUniqueAlignedArray<std::uint64_t>(tests);
  RngLoop(seed, result_array.get(), tests);
  std::vector<internal::Xoshiro> reference;
  reference.emplace_back(seed);
  const ScalableTag<std::uint64_t> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 1UL; i < lanes; ++i) {
    auto rng = reference.back();
    rng.Jump();
    reference.emplace_back(rng);
  }

  for (std::size_t i = 0UL; i < tests; i += lanes) {
    for (std::size_t lane = 0UL; lane < lanes; ++lane) {
      const std::uint64_t result = reference[lane]();
      if (result_array[i + lane] != result) {
        std::cerr << "SEED: " << seed << std::endl;
        std::cerr << "TEST UINT64 GENERATOR ERROR: result_array[" << i + lane
                  << "] -> " << result_array[i + lane] << " != " << result
                  << std::endl;
        HWY_ASSERT(0);
      }
    }
  }
}
void TestUniformDist() {
#if HWY_HAVE_FLOAT64
  const std::uint64_t seed = GetSeed();
  const auto result_array = hwy::MakeUniqueAlignedArray<double>(tests);
  UniformLoop(seed, result_array.get(), tests);
  internal::Xoshiro reference{seed};
  const ScalableTag<double> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 0UL; i < tests; i += lanes) {
    const double result = reference.Uniform();
    if (result_array[i] != result) {
      std::cerr << "SEED: " << seed << std::endl;
      std::cerr << "TEST UNIFORM GENERATOR ERROR: result_array[" << i << "] -> "
                << result_array[i] << " != " << result << std::endl;
      HWY_ASSERT(0);
    }
  }
#endif  // HWY_HAVE_FLOAT64
}

void TestNextNRandomUint64() {
  const std::uint64_t seed = GetSeed();
  VectorXoshiro generator{seed};
  const auto result_array = generator.operator()(tests);
  std::vector<internal::Xoshiro> reference;
  reference.emplace_back(seed);
  const ScalableTag<std::uint64_t> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 1UL; i < lanes; ++i) {
    auto rng = reference.back();
    rng.Jump();
    reference.emplace_back(rng);
  }

  for (std::size_t i = 0UL; i < tests; i += lanes) {
    for (std::size_t lane = 0UL; lane < lanes; ++lane) {
      const std::uint64_t result = reference[lane]();
      if (result_array[i + lane] != result) {
        std::cerr << "SEED: " << seed << std::endl;
        std::cerr << "TEST UINT64 GENERATOR ERROR: result_array[" << i + lane
                  << "] -> " << result_array[i + lane] << " != " << result
                  << std::endl;
        HWY_ASSERT(0);
      }
    }
  }
}

void TestNextFixedNRandomUint64() {
  const std::uint64_t seed = GetSeed();
  VectorXoshiro generator{seed};
  const auto result_array = generator.operator()<tests>();
  std::vector<internal::Xoshiro> reference;
  reference.emplace_back(seed);
  const ScalableTag<std::uint64_t> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 1UL; i < lanes; ++i) {
    auto rng = reference.back();
    rng.Jump();
    reference.emplace_back(rng);
  }

  for (std::size_t i = 0UL; i < tests; i += lanes) {
    for (std::size_t lane = 0UL; lane < lanes; ++lane) {
      const std::uint64_t result = reference[lane]();
      if (result_array[i + lane] != result) {
        std::cerr << "SEED: " << seed << std::endl;
        std::cerr << "TEST UINT64 GENERATOR ERROR: result_array[" << i + lane
                  << "] -> " << result_array[i + lane] << " != " << result
                  << std::endl;

        HWY_ASSERT(0);
      }
    }
  }
}
void TestNextNUniformDist() {
#if HWY_HAVE_FLOAT64
  const std::uint64_t seed = GetSeed();
  VectorXoshiro generator{seed};
  const auto result_array = generator.Uniform(tests);
  internal::Xoshiro reference{seed};
  const ScalableTag<double> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 0UL; i < tests; i += lanes) {
    const double result = reference.Uniform();
    if (result_array[i] != result) {
      std::cerr << "SEED: " << seed << std::endl;
      std::cerr << "TEST UNIFORM GENERATOR ERROR: result_array[" << i << "] -> "
                << result_array[i] << " != " << result << std::endl;

      HWY_ASSERT(0);
    }
  }
#endif  // HWY_HAVE_FLOAT64
}

void TestNextFixedNUniformDist() {
#if HWY_HAVE_FLOAT64
  const std::uint64_t seed = GetSeed();
  VectorXoshiro generator{seed};
  const auto result_array = generator.Uniform<tests>();
  internal::Xoshiro reference{seed};
  const ScalableTag<double> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 0UL; i < tests; i += lanes) {
    const double result = reference.Uniform();
    if (result_array[i] != result) {
      std::cerr << "SEED: " << seed << std::endl;
      std::cerr << "TEST UNIFORM GENERATOR ERROR: result_array[" << i << "] -> "
                << result_array[i] << " != " << result << std::endl;
      HWY_ASSERT(0);
    }
  }
#endif  // HWY_HAVE_FLOAT64
}

void TestCachedXorshiro() {
  const std::uint64_t seed = GetSeed();

  CachedXoshiro<> generator{seed};
  std::vector<internal::Xoshiro> reference;
  reference.emplace_back(seed);
  const ScalableTag<std::uint64_t> d;
  const std::size_t lanes = Lanes(d);
  for (std::size_t i = 1UL; i < lanes; ++i) {
    auto rng = reference.back();
    rng.Jump();
    reference.emplace_back(rng);
  }

  for (std::size_t i = 0UL; i < tests; i += lanes) {
    for (std::size_t lane = 0UL; lane < lanes; ++lane) {
      const std::uint64_t result = reference[lane]();
      const std::uint64_t got = generator();
      if (got != result) {
        std::cerr << "SEED: " << seed << std::endl;
        std::cerr << "TEST CachedXoshiro GENERATOR ERROR: result_array["
                  << i + lane << "] -> " << got << " != " << result
                  << std::endl;

        HWY_ASSERT(0);
      }
    }
  }
}
void TestUniformCachedXorshiro() {
#if HWY_HAVE_FLOAT64
  const std::uint64_t seed = GetSeed();

  CachedXoshiro<> generator{seed};
  std::uniform_real_distribution<double> distribution{0., 1.};
  for (std::size_t i = 0UL; i < tests; ++i) {
    const double result = distribution(generator);

    if (result < 0. || result >= 1.) {
      std::cerr << "SEED: " << seed << std::endl;
      std::cerr << "TEST CachedXoshiro GENERATOR ERROR: result_array[" << i
                << "] -> " << result << " not in interval [0, 1)" << std::endl;
      HWY_ASSERT(0);
    }
  }
#endif  // HWY_HAVE_FLOAT64
}

}  // namespace
// NOLINTNEXTLINE(google-readability-namespace-comments)
}  // namespace HWY_NAMESPACE
}  // namespace hwy
HWY_AFTER_NAMESPACE();  // required if not using HWY_ATTR

#if HWY_ONCE
namespace hwy {
namespace {
HWY_BEFORE_TEST(HwyRandomTest);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestSeeding);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestMultiThreadSeeding);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestRandomUint64);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestNextNRandomUint64);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestNextFixedNRandomUint64);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestCachedXorshiro);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestUniformDist);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestNextNUniformDist);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestNextFixedNUniformDist);
HWY_EXPORT_AND_TEST_P(HwyRandomTest, TestUniformCachedXorshiro);
HWY_AFTER_TEST();
}  // namespace
}  // namespace hwy
HWY_TEST_MAIN();
#endif  // HWY_ONCE