From aa844899c937bde5d2b24f276b59997e5b668bde Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Thu, 8 Aug 2019 10:56:58 -0700 Subject: Creation of LTS branch "lts_2019_08_08" - 9ee91d3e430fb33a4590486573792eb0fa146c2d Export of internal Abseil changes by Abseil Team - 8efba58a3b656e9b41fb0471ae6453425a61c520 Export of internal Abseil changes by Abseil Team - b49b8d16b67ec6912899684b732e6367f258cfdb Export of internal Abseil changes by Abseil Team - 67222ffc4c83d918ce8395aa61769eeb77df4c4d Export of internal Abseil changes by Abseil Team - c5c4db4f5191fe5e76cbf68dcc71fb28702f7d2b Export of internal Abseil changes by Abseil Team - 14550beb3b7b97195e483fb74b5efb906395c31e Export of internal Abseil changes. by Abseil Team - 52e88ee56b72cf32bc66534d942c7398ce481331 Export of internal Abseil changes. by Abseil Team - 36d37ab992038f52276ca66b9da80c1cf0f57dc2 Export of internal Abseil changes. by Abseil Team - ad1485c8986246b2ae9105e512738d0e97aec887 Export of internal Abseil changes. by Abseil Team - 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968a34ffdaadd7db062a9621dfbdf8b2d16e05af Export of internal Abseil changes. by Abseil Team - 3e2e9b5557e76d098de4b8a2a659125b98ca519b Merge pull request #231 from uilianries/feature/conan by Mark Barolak - 111ca7060a6ff50115ca85b59f6b5d8c8c5e9105 Export of internal Abseil changes. by Abseil Team - 389ec3f906f018661a5308458d623d01f96d7b23 Export of internal Abseil changes. by Abseil Team - 8fbcdb90952c57828c4a9c2f6d79fcd7cae9088f Export of internal Abseil changes. by Abseil Team - 455dc17ba1af9635f0b60155bc565bc572a1e722 Export of internal Abseil changes. by Abseil Team - f197d7c72a54064cfde5a2058f1513a4a0ee36fb Export of internal Abseil changes. by Abseil Team - 284378a71b32dfb3af4e3661f585e671d1b603a3 Export of internal Abseil changes. by Abseil Team GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced --- absl/random/internal/pcg_engine_test.cc | 638 ++++++++++++++++++++++++++++++++ 1 file changed, 638 insertions(+) create mode 100644 absl/random/internal/pcg_engine_test.cc (limited to 'absl/random/internal/pcg_engine_test.cc') diff --git a/absl/random/internal/pcg_engine_test.cc b/absl/random/internal/pcg_engine_test.cc new file mode 100644 index 00000000..4d763e89 --- /dev/null +++ b/absl/random/internal/pcg_engine_test.cc @@ -0,0 +1,638 @@ +// Copyright 2018 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// 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 "absl/random/internal/pcg_engine.h" + +#include +#include +#include +#include + +#include "gmock/gmock.h" +#include "gtest/gtest.h" +#include "absl/random/internal/explicit_seed_seq.h" +#include "absl/time/clock.h" + +#define UPDATE_GOLDEN 0 + +namespace { + +using absl::random_internal::ExplicitSeedSeq; +using absl::random_internal::pcg32_2018_engine; +using absl::random_internal::pcg64_2018_engine; + +template +class PCGEngineTest : public ::testing::Test {}; + +using EngineTypes = ::testing::Types; + +TYPED_TEST_SUITE(PCGEngineTest, EngineTypes); + +TYPED_TEST(PCGEngineTest, VerifyReseedChangesAllValues) { + using engine_type = TypeParam; + using result_type = typename engine_type::result_type; + + const size_t kNumOutputs = 16; + engine_type engine; + + // MSVC emits error 2719 without the use of std::ref below. + // * formal parameter with __declspec(align('#')) won't be aligned + + { + std::seed_seq seq1{1, 2, 3, 4, 5, 6, 7}; + engine.seed(seq1); + } + result_type a[kNumOutputs]; + std::generate(std::begin(a), std::end(a), std::ref(engine)); + + { + std::random_device rd; + std::seed_seq seq2{rd(), rd(), rd()}; + engine.seed(seq2); + } + result_type b[kNumOutputs]; + std::generate(std::begin(b), std::end(b), std::ref(engine)); + + // Verify that two uncorrelated values have ~50% of there bits in common. Use + // a 10% margin-of-error to reduce flakiness. + size_t changed_bits = 0; + size_t unchanged_bits = 0; + size_t total_set = 0; + size_t total_bits = 0; + size_t equal_count = 0; + for (size_t i = 0; i < kNumOutputs; ++i) { + equal_count += (a[i] == b[i]) ? 1 : 0; + std::bitset bitset(a[i] ^ b[i]); + changed_bits += bitset.count(); + unchanged_bits += bitset.size() - bitset.count(); + + std::bitset a_set(a[i]); + std::bitset b_set(b[i]); + total_set += a_set.count() + b_set.count(); + total_bits += 2 * 8 * sizeof(result_type); + } + // On average, half the bits are changed between two calls. + EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits)); + EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits)); + + // verify using a quick normal-approximation to the binomial. + EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits)) + << "@" << total_set / static_cast(total_bits); + + // Also, A[i] == B[i] with probability (1/range) * N. + // Give this a pretty wide latitude, though. + const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8); + EXPECT_LE(equal_count, 1.0 + kExpected); +} + +// Number of values that needs to be consumed to clean two sizes of buffer +// and trigger third refresh. (slightly overestimates the actual state size). +constexpr size_t kTwoBufferValues = 16; + +TYPED_TEST(PCGEngineTest, VerifyDiscard) { + using engine_type = TypeParam; + + for (size_t num_used = 0; num_used < kTwoBufferValues; ++num_used) { + engine_type engine_used; + for (size_t i = 0; i < num_used; ++i) { + engine_used(); + } + + for (size_t num_discard = 0; num_discard < kTwoBufferValues; + ++num_discard) { + engine_type engine1 = engine_used; + engine_type engine2 = engine_used; + for (size_t i = 0; i < num_discard; ++i) { + engine1(); + } + engine2.discard(num_discard); + for (size_t i = 0; i < kTwoBufferValues; ++i) { + const auto r1 = engine1(); + const auto r2 = engine2(); + ASSERT_EQ(r1, r2) << "used=" << num_used << " discard=" << num_discard; + } + } + } +} + +TYPED_TEST(PCGEngineTest, StreamOperatorsResult) { + using engine_type = TypeParam; + + std::wostringstream os; + std::wistringstream is; + engine_type engine; + + EXPECT_EQ(&(os << engine), &os); + EXPECT_EQ(&(is >> engine), &is); +} + +TYPED_TEST(PCGEngineTest, StreamSerialization) { + using engine_type = TypeParam; + + for (size_t discard = 0; discard < kTwoBufferValues; ++discard) { + ExplicitSeedSeq seed_sequence{12, 34, 56}; + engine_type engine(seed_sequence); + engine.discard(discard); + + std::stringstream stream; + stream << engine; + + engine_type new_engine; + stream >> new_engine; + for (size_t i = 0; i < 64; ++i) { + EXPECT_EQ(engine(), new_engine()) << " " << i; + } + } +} + +constexpr size_t kNumGoldenOutputs = 127; + +// This test is checking if randen_engine is meets interface requirements +// defined in [rand.req.urbg]. +TYPED_TEST(PCGEngineTest, RandomNumberEngineInterface) { + using engine_type = TypeParam; + + using E = engine_type; + using T = typename E::result_type; + + static_assert(std::is_copy_constructible::value, + "engine_type must be copy constructible"); + + static_assert(absl::is_copy_assignable::value, + "engine_type must be copy assignable"); + + static_assert(std::is_move_constructible::value, + "engine_type must be move constructible"); + + static_assert(absl::is_move_assignable::value, + "engine_type must be move assignable"); + + static_assert(std::is_same()()), T>::value, + "return type of operator() must be result_type"); + + // Names after definition of [rand.req.urbg] in C++ standard. + // e us a value of E + // v is a lvalue of E + // x, y are possibly const values of E + // s is a value of T + // q is a value satisfying requirements of seed_sequence + // z is a value of type unsigned long long + // os is a some specialization of basic_ostream + // is is a some specialization of basic_istream + + E e, v; + const E x, y; + T s = 1; + std::seed_seq q{1, 2, 3}; + unsigned long long z = 1; // NOLINT(runtime/int) + std::wostringstream os; + std::wistringstream is; + + E{}; + E{x}; + E{s}; + E{q}; + + e.seed(); + + // MSVC emits error 2718 when using EXPECT_EQ(e, x) + // * actual parameter with __declspec(align('#')) won't be aligned + EXPECT_TRUE(e == x); + + e.seed(q); + { + E tmp(q); + EXPECT_TRUE(e == tmp); + } + + e(); + { + E tmp(q); + EXPECT_TRUE(e != tmp); + } + + e.discard(z); + + static_assert(std::is_same::value, + "return type of operator== must be bool"); + + static_assert(std::is_same::value, + "return type of operator== must be bool"); +} + +TYPED_TEST(PCGEngineTest, RandenEngineSFINAETest) { + using engine_type = TypeParam; + using result_type = typename engine_type::result_type; + + { + engine_type engine(result_type(1)); + engine.seed(result_type(1)); + } + + { + result_type n = 1; + engine_type engine(n); + engine.seed(n); + } + + { + engine_type engine(1); + engine.seed(1); + } + + { + int n = 1; + engine_type engine(n); + engine.seed(n); + } + + { + std::seed_seq seed_seq; + engine_type engine(seed_seq); + engine.seed(seed_seq); + } + + { + engine_type engine{std::seed_seq()}; + engine.seed(std::seed_seq()); + } +} + +// ------------------------------------------------------------------ +// Stability tests for pcg64_2018_engine +// ------------------------------------------------------------------ +TEST(PCG642018EngineTest, VerifyGolden) { + constexpr uint64_t kGolden[kNumGoldenOutputs] = { + 0x01070196e695f8f1, 0x703ec840c59f4493, 0xe54954914b3a44fa, + 0x96130ff204b9285e, 0x7d9fdef535ceb21a, 0x666feed42e1219a0, + 0x981f685721c8326f, 0xad80710d6eab4dda, 0xe202c480b037a029, + 0x5d3390eaedd907e2, 0x0756befb39c6b8aa, 0x1fb44ba6634d62a3, + 0x8d20423662426642, 0x34ea910167a39fb4, 0x93010b43a80d0ab6, + 0x663db08a98fc568a, 0x720b0a1335956fae, 0x2c35483e31e1d3ba, + 0x429f39776337409d, 0xb46d99e638687344, 0x105370b96aedcaee, + 0x3999e92f811cff71, 0xd230f8bcb591cfc9, 0x0dce3db2ba7bdea5, + 0xcf2f52c91eec99af, 0x2bc7c24a8b998a39, 0xbd8af1b0d599a19c, + 0x56bc45abc66059f5, 0x170a46dc170f7f1e, 0xc25daf5277b85fad, + 0xe629c2e0c948eadb, 0x1720a796915542ed, 0x22fb0caa4f909951, + 0x7e0c0f4175acd83d, 0xd9fcab37ff2a860c, 0xab2280fb2054bad1, + 0x58e8a06f37fa9e99, 0xc3a52a30b06528c7, 0x0175f773a13fc1bd, + 0x731cfc584b00e840, 0x404cc7b2648069cb, 0x5bc29153b0b7f783, + 0x771310a38cc999d1, 0x766a572f0a71a916, 0x90f450fb4fc48348, + 0xf080ea3e1c7b1a0d, 0x15471a4507d66a44, 0x7d58e55a78f3df69, + 0x0130a094576ac99c, 0x46669cb2d04b1d87, 0x17ab5bed20191840, + 0x95b177d260adff3e, 0x025fb624b6ee4c07, 0xb35de4330154a95f, + 0xe8510fff67e24c79, 0x132c3cbcd76ed2d3, 0x35e7cc145a093904, + 0x9f5b5b5f81583b79, 0x3ee749a533966233, 0x4af85886cdeda8cd, + 0x0ca5380ecb3ef3aa, 0x4f674eb7661d3192, 0x88a29aad00cd7733, + 0x70b627ca045ffac6, 0x5912b43ea887623d, 0x95dc9fc6f62cf221, + 0x926081a12a5c905b, 0x9c57d4cd7dfce651, 0x85ab2cbf23e3bb5d, + 0xc5cd669f63023152, 0x3067be0fad5d898e, 0x12b56f444cb53d05, + 0xbc2e5a640c3434fc, 0x9280bff0e4613fe1, 0x98819094c528743e, + 0x999d1c98d829df33, 0x9ff82a012dc89242, 0xf99183ed39c8be94, + 0xf0f59161cd421c55, 0x3c705730c2f6c48d, 0x66ad85c6e9278a61, + 0x2a3428e4a428d5d0, 0x79207d68fd04940d, 0xea7f2b402edc8430, + 0xa06b419ac857f63b, 0xcb1dd0e6fbc47e1c, 0x4f55229200ada6a4, + 0x9647b5e6359c927f, 0x30bf8f9197c7efe5, 0xa79519529cc384d0, + 0xbb22c4f339ad6497, 0xd7b9782f59d14175, 0x0dff12fff2ec0118, + 0xa331ad8305343a7c, 0x48dad7e3f17e0862, 0x324c6fb3fd3c9665, + 0xf0e4350e7933dfc4, 0x7ccda2f30b8b03b6, 0xa0afc6179005de40, + 0xee65da6d063b3a30, 0xb9506f42f2bfe87a, 0xc9a2e26b0ef5baa0, + 0x39fa9d4f495011d6, 0xbecc21a45d023948, 0x6bf484c6593f737f, + 0x8065e0070cadc3b7, 0x9ef617ed8d419799, 0xac692cf8c233dd15, + 0xd2ed87583c4ebb98, 0xad95ba1bebfedc62, 0x9b60b160a8264e43, + 0x0bc8c45f71fcf25b, 0x4a78035cdf1c9931, 0x4602dc106667e029, + 0xb335a3c250498ac8, 0x0256ebc4df20cab8, 0x0c61efd153f0c8d9, + 0xe5d0150a4f806f88, 0x99d6521d351e7d87, 0x8d4888c9f80f4325, + 0x106c5735c1ba868d, 0x73414881b880a878, 0x808a9a58a3064751, + 0x339a29f3746de3d5, 0x5410d7fa4f873896, 0xd84623c81d7b8a03, + 0x1f7c7e7a7f47f462, + }; + + pcg64_2018_engine engine(0); +#if UPDATE_GOLDEN + (void)kGolden; // Silence warning. + for (size_t i = 0; i < kNumGoldenOutputs; ++i) { + printf("0x%016lx, ", engine()); + if (i % 3 == 2) { + printf("\n"); + } + } + printf("\n\n\n"); +#else + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } + engine.seed(); + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } +#endif +} + +TEST(PCG642018EngineTest, VerifyGoldenSeeded) { + constexpr uint64_t kGolden[kNumGoldenOutputs] = { + 0xb03988f1e39691ee, 0xbd2a1eb5ac31e97a, 0x8f00d6d433634d02, + 0x1823c28d483d5776, 0x000c3ee3e1aeb74a, 0xfa82ef27a4f3df9c, + 0xc6f382308654e454, 0x414afb1a238996c2, 0x4703a4bc252eb411, + 0x99d64f62c8f7f654, 0xbb07ebe11a34fa44, 0x79eb06a363c06131, + 0xf66ad3756f1c6b21, 0x130c01d5e869f457, 0x5ca2b9963aecbc81, + 0xfef7bebc1de27e6c, 0x1d174faa5ed2cdbf, 0xd75b7a773f2bb889, + 0xc35c872327a170a5, 0x46da6d88646a42fe, 0x4622985e0442dae2, + 0xbe3cbd67297f1f9b, 0xe7c37b4a4798bfd1, 0x173d5dfad15a25c3, + 0x0eb6849ba2961522, 0xb0ff7246e6700d73, 0x88cb9c42d3afa577, + 0xb609731dbd94d917, 0xd3941cda04b40081, 0x28d140f7409bea3a, + 0x3c96699a920a124a, 0xdb28be521958b2fd, 0x0a3f44db3d4c5124, + 0x7ac8e60ba13b70d2, 0x75f03a41ded5195a, 0xaed10ac7c4e4825d, + 0xb92a3b18aadb7adc, 0xda45e0081f2bca46, 0x74d39ab3753143fc, + 0xb686038018fac9ca, 0x4cc309fe99542dbb, 0xf3e1a4fcb311097c, + 0x58763d6fa698d69d, 0xd11c365dbecd8d60, 0x2c15d55725b1dee7, + 0x89805f254d85658c, 0x2374c44dfc62158b, 0x9a8350fa7995328d, + 0x198f838970cf91da, 0x96aff569562c0e53, 0xd76c8c52b7ec6e3f, + 0x23a01cd9ae4baa81, 0x3adb366b6d02a893, 0xb3313e2a4c5b333f, + 0x04c11230b96a5425, 0x1f7f7af04787d571, 0xaddb019365275ec7, + 0x5c960468ccb09f42, 0x8438db698c69a44a, 0x492be1e46111637e, + 0x9c6c01e18100c610, 0xbfe48e75b7d0aceb, 0xb5e0b89ec1ce6a00, + 0x9d280ecbc2fe8997, 0x290d9e991ba5fcab, 0xeec5bec7d9d2a4f0, + 0x726e81488f19150e, 0x1a6df7955a7e462c, 0x37a12d174ba46bb5, + 0x3cdcdffd96b1b5c5, 0x2c5d5ac10661a26e, 0xa742ed18f22e50c4, + 0x00e0ed88ff0d8a35, 0x3d3c1718cb1efc0b, 0x1d70c51ffbccbf11, + 0xfbbb895132a4092f, 0x619d27f2fb095f24, 0x69af68200985e5c4, + 0xbee4885f57373f8d, 0x10b7a6bfe0587e40, 0xa885e6cf2f7e5f0a, + 0x59f879464f767550, 0x24e805d69056990d, 0x860970b911095891, + 0xca3189954f84170d, 0x6652a5edd4590134, 0x5e1008cef76174bf, + 0xcbd417881f2bcfe5, 0xfd49fc9d706ecd17, 0xeebf540221ebd066, + 0x46af7679464504cb, 0xd4028486946956f1, 0xd4f41864b86c2103, + 0x7af090e751583372, 0x98cdaa09278cb642, 0xffd42b921215602f, + 0x1d05bec8466b1740, 0xf036fa78a0132044, 0x787880589d1ecc78, + 0x5644552cfef33230, 0x0a97e275fe06884b, 0x96d1b13333d470b5, + 0xc8b3cdad52d3b034, 0x091357b9db7376fd, 0xa5fe4232555edf8c, + 0x3371bc3b6ada76b5, 0x7deeb2300477c995, 0x6fc6d4244f2849c1, + 0x750e8cc797ca340a, 0x81728613cd79899f, 0x3467f4ee6f9aeb93, + 0x5ef0a905f58c640f, 0x432db85e5101c98a, 0x6488e96f46ac80c2, + 0x22fddb282625048c, 0x15b287a0bc2d4c5d, 0xa7e2343ef1f28bce, + 0xc87ee1aa89bed09e, 0x220610107812c5e9, 0xcbdab6fcd640f586, + 0x8d41047970928784, 0x1aa431509ec1ade0, 0xac3f0be53f518ddc, + 0x16f4428ad81d0cbb, 0x675b13c2736fc4bb, 0x6db073afdd87e32d, + 0x572f3ca2f1a078c6, + }; + + ExplicitSeedSeq seed_sequence{12, 34, 56}; + pcg64_2018_engine engine(seed_sequence); +#if UPDATE_GOLDEN + (void)kGolden; // Silence warning. + for (size_t i = 0; i < kNumGoldenOutputs; ++i) { + printf("0x%016lx, ", engine()); + if (i % 3 == 2) { + printf("\n"); + } + } + printf("\n\n\n"); +#else + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } + engine.seed(seed_sequence); + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } +#endif +} + +TEST(PCG642018EngineTest, VerifyGoldenFromDeserializedEngine) { + constexpr uint64_t kGolden[kNumGoldenOutputs] = { + 0xdd425b47b4113dea, 0x1b07176479d444b0, 0x6b391027586f2e42, + 0xa166f2b15f4a2143, 0xffb6dbd7a179ee97, 0xb2c00035365bf0b1, + 0x8fbb518b45855521, 0xfc789a55ddf87c3b, 0x429531f0f17ff355, + 0xbe708560d603d283, 0x5bff415175c5cb6b, 0xe813491f4ad45394, + 0xa853f4506d55880d, 0x7e538453e568172e, 0xe101f1e098ddd0ec, + 0x6ee31266ee4c766d, 0xa8786d92d66b39d7, 0xfee622a2acf5e5b0, + 0x5fe8e82c102fa7b3, 0x01f10be4cdb53c9d, 0xbe0545366f857022, + 0x12e74f010a339bca, 0xb10d85ca40d5ce34, 0xe80d6feba5054875, + 0x2b7c1ee6d567d4ee, 0x2a9cd043bfd03b66, 0x5cfc531bd239f3f1, + 0x1c4734e4647d70f5, 0x85a8f60f006b5760, 0x6a4239ce76dca387, + 0x8da0f86d7339335c, 0xf055b0468551374d, 0x486e8567e9bea9a0, + 0x4cb531b8405192dd, 0xf813b1ee3157110b, 0x214c2a664a875d8e, + 0x74531237b29b35f7, 0xa6f0267bb77a771e, 0x64b552bff54184a4, + 0xa2d6f7af2d75b6fc, 0x460a10018e03b5ab, 0x76fd1fdcb81d0800, + 0x76f5f81805070d9d, 0x1fb75cb1a70b289a, 0x9dfd25a022c4b27f, + 0x9a31a14a80528e9e, 0x910dc565ddc25820, 0xd6aef8e2b0936c10, + 0xe1773c507fe70225, 0xe027fd7aadd632bc, 0xc1fecb427089c8b8, + 0xb5c74c69fa9dbf26, 0x71bf9b0e4670227d, 0x25f48fad205dcfdd, + 0x905248ec4d689c56, 0x5c2b7631b0de5c9d, 0x9f2ee0f8f485036c, + 0xfd6ce4ebb90bf7ea, 0xd435d20046085574, 0x6b7eadcb0625f986, + 0x679d7d44b48be89e, 0x49683b8e1cdc49de, 0x4366cf76e9a2f4ca, + 0x54026ec1cdad7bed, 0xa9a04385207f28d3, 0xc8e66de4eba074b2, + 0x40b08c42de0f4cc0, 0x1d4c5e0e93c5bbc0, 0x19b80792e470ae2d, + 0x6fcaaeaa4c2a5bd9, 0xa92cb07c4238438e, 0x8bb5c918a007e298, + 0x7cd671e944874cf4, 0x88166470b1ba3cac, 0xd013d476eaeeade6, + 0xcee416947189b3c3, 0x5d7c16ab0dce6088, 0xd3578a5c32b13d27, + 0x3875db5adc9cc973, 0xfbdaba01c5b5dc56, 0xffc4fdd391b231c3, + 0x2334520ecb164fec, 0x361c115e7b6de1fa, 0xeee58106cc3563d7, + 0x8b7f35a8db25ebb8, 0xb29d00211e2cafa6, 0x22a39fe4614b646b, + 0x92ca6de8b998506d, 0x40922fe3d388d1db, 0x9da47f1e540f802a, + 0x811dceebf16a25db, 0xf6524ae22e0e53a9, 0x52d9e780a16eb99d, + 0x4f504286bb830207, 0xf6654d4786bd5cc3, 0x00bd98316003a7e1, + 0xefda054a6ab8f5f3, 0x46cfb0f4c1872827, 0xc22b316965c0f3b2, + 0xd1a28087c7e7562a, 0xaa4f6a094b7f5cff, 0xfe2bc853a041f7da, + 0xe9d531402a83c3ba, 0xe545d8663d3ce4dd, 0xfa2dcd7d91a13fa8, + 0xda1a080e52a127b8, 0x19c98f1f809c3d84, 0x2cef109af4678c88, + 0x53462accab3b9132, 0x176b13a80415394e, 0xea70047ef6bc178b, + 0x57bca80506d6dcdf, 0xd853ba09ff09f5c4, 0x75f4df3a7ddd4775, + 0x209c367ade62f4fe, 0xa9a0bbc74d5f4682, 0x5dfe34bada86c21a, + 0xc2c05bbcd38566d1, 0x6de8088e348c916a, 0x6a7001c6000c2196, + 0xd9fb51865fc4a367, 0x12f320e444ece8ff, 0x6d56f7f793d65035, + 0x138f31b7a865f8aa, 0x58fc68b4026b9adf, 0xcd48954b79fb6436, + 0x27dfce4a0232af87, + }; + +#if UPDATE_GOLDEN + (void)kGolden; // Silence warning. + std::seed_seq seed_sequence{1, 2, 3}; + pcg64_2018_engine engine(seed_sequence); + std::ostringstream stream; + stream << engine; + auto str = stream.str(); + printf("%s\n\n", str.c_str()); + for (size_t i = 0; i < kNumGoldenOutputs; ++i) { + printf("0x%016lx, ", engine()); + if (i % 3 == 2) { + printf("\n"); + } + } + printf("\n\n\n"); +#else + pcg64_2018_engine engine; + std::istringstream stream( + "2549297995355413924 4865540595714422341 6364136223846793005 " + "1442695040888963407 18088519957565336995 4845369368158826708"); + stream >> engine; + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } +#endif +} + +// ------------------------------------------------------------------ +// Stability tests for pcg32_2018_engine +// ------------------------------------------------------------------ +TEST(PCG322018EngineTest, VerifyGolden) { + constexpr uint32_t kGolden[kNumGoldenOutputs] = { + 0x7a7ecbd9, 0x89fd6c06, 0xae646aa8, 0xcd3cf945, 0x6204b303, 0x198c8585, + 0x49fce611, 0xd1e9297a, 0x142d9440, 0xee75f56b, 0x473a9117, 0xe3a45903, + 0xbce807a1, 0xe54e5f4d, 0x497d6c51, 0x61829166, 0xa740474b, 0x031912a8, + 0x9de3defa, 0xd266dbf1, 0x0f38bebb, 0xec3c4f65, 0x07c5057d, 0xbbce03c8, + 0xfd2ac7a8, 0xffcf4773, 0x5b10affb, 0xede1c842, 0xe22b01b7, 0xda133c8c, + 0xaf89b0f4, 0x25d1b8bc, 0x9f625482, 0x7bfd6882, 0x2e2210c0, 0x2c8fb9a6, + 0x42cb3b83, 0x40ce0dab, 0x644a3510, 0x36230ef2, 0xe2cb6d43, 0x1012b343, + 0x746c6c9f, 0x36714cf8, 0xed1f5026, 0x8bbbf83e, 0xe98710f4, 0x8a2afa36, + 0x09035349, 0x6dc1a487, 0x682b634b, 0xc106794f, 0x7dd78beb, 0x628c262b, + 0x852fb232, 0xb153ac4c, 0x4f169d1b, 0xa69ab774, 0x4bd4b6f2, 0xdc351dd3, + 0x93ff3c8c, 0xa30819ab, 0xff07758c, 0x5ab13c62, 0xd16d7fb5, 0xc4950ffa, + 0xd309ae49, 0xb9677a87, 0x4464e317, 0x90dc44f1, 0xc694c1d4, 0x1d5e1168, + 0xadf37a2d, 0xda38990d, 0x1ec4bd33, 0x36ca25ce, 0xfa0dc76a, 0x968a9d43, + 0x6950ac39, 0xdd3276bc, 0x06d5a71e, 0x1f6f282d, 0x5c626c62, 0xdde3fc31, + 0x152194ce, 0xc35ed14c, 0xb1f7224e, 0x47f76bb8, 0xb34fdd08, 0x7011395e, + 0x162d2a49, 0x0d1bf09f, 0x9428a952, 0x03c5c344, 0xd3525616, 0x7816fff3, + 0x6bceb8a8, 0x8345a081, 0x366420fd, 0x182abeda, 0x70f82745, 0xaf15ded8, + 0xc7f52ca2, 0xa98db9c5, 0x919d99ba, 0x9c376c1c, 0xed8d34c2, 0x716ae9f5, + 0xef062fa5, 0xee3b6c56, 0x52325658, 0x61afa9c3, 0xfdaf02f0, 0x961cf3ab, + 0x9f291565, 0x4fbf3045, 0x0590c899, 0xde901385, 0x45005ffb, 0x509db162, + 0x262fa941, 0x4c421653, 0x4b17c21e, 0xea0d1530, 0xde803845, 0x61bfd515, + 0x438523ef, + }; + + pcg32_2018_engine engine(0); +#if UPDATE_GOLDEN + (void)kGolden; // Silence warning. + for (size_t i = 0; i < kNumGoldenOutputs; ++i) { + printf("0x%08x, ", engine()); + if (i % 6 == 5) { + printf("\n"); + } + } + printf("\n\n\n"); +#else + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } + engine.seed(); + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } +#endif +} + +TEST(PCG322018EngineTest, VerifyGoldenSeeded) { + constexpr uint32_t kGolden[kNumGoldenOutputs] = { + 0x60b5a64c, 0x978502f9, 0x80a75f60, 0x241f1158, 0xa4cd1dbb, 0xe7284017, + 0x3b678da5, 0x5223ec99, 0xe4bdd5d9, 0x72190e6d, 0xe6e702c9, 0xff80c768, + 0xcf126ed3, 0x1fbd20ab, 0x60980489, 0xbc72bf89, 0x407ac6c0, 0x00bf3c51, + 0xf9087897, 0x172e4eb6, 0xe9e4f443, 0x1a6098bf, 0xbf44f8c2, 0xdd84a0e5, + 0xd9a52364, 0xc0e2e786, 0x061ae2ba, 0x9facb8e3, 0x6109432d, 0xd4e0a013, + 0xbd8eb9a6, 0x7e86c3b6, 0x629c0e68, 0x05337430, 0xb495b9f4, 0x11ccd65d, + 0xb578db25, 0x66f1246d, 0x6ef20a7f, 0x5e429812, 0x11772130, 0xb944b5c2, + 0x01624128, 0xa2385ab7, 0xd3e10d35, 0xbe570ec3, 0xc951656f, 0xbe8944a0, + 0x7be41062, 0x5709f919, 0xd745feda, 0x9870b9ae, 0xb44b8168, 0x19e7683b, + 0xded8017f, 0xc6e4d544, 0x91ae4225, 0xd6745fba, 0xb992f284, 0x65b12b33, + 0xa9d5fdb4, 0xf105ce1a, 0x35ca1a6e, 0x2ff70dd0, 0xd8335e49, 0xfb71ddf2, + 0xcaeabb89, 0x5c6f5f84, 0x9a811a7d, 0xbcecbbd1, 0x0f661ba0, 0x9ad93b9d, + 0xedd23e0b, 0x42062f48, 0xd38dd7e4, 0x6cd63c9c, 0x640b98ae, 0x4bff5653, + 0x12626371, 0x13266017, 0xe7a698d8, 0x39c74667, 0xe8fdf2e3, 0x52803bf8, + 0x2af6895b, 0x91335b7b, 0x699e4961, 0x00a40fff, 0x253ff2b6, 0x4a6cf672, + 0x9584e85f, 0xf2a5000c, 0x4d58aba8, 0xb8513e6a, 0x767fad65, 0x8e326f9e, + 0x182f15a1, 0x163dab52, 0xdf99c780, 0x047282a1, 0xee4f90dd, 0xd50394ae, + 0x6c9fd5f0, 0xb06a9194, 0x387e3840, 0x04a9487b, 0xf678a4c2, 0xd0a78810, + 0xd502c97e, 0xd6a9b12a, 0x4accc5dc, 0x416ed53e, 0x50411536, 0xeeb89c24, + 0x813a7902, 0x034ebca6, 0xffa52e7c, 0x7ecd3d0e, 0xfa37a0d2, 0xb1fbe2c1, + 0xb7efc6d1, 0xefa4ccee, 0xf6f80424, 0x2283f3d9, 0x68732284, 0x94f3b5c8, + 0xbbdeceb9, + }; + + ExplicitSeedSeq seed_sequence{12, 34, 56}; + pcg32_2018_engine engine(seed_sequence); +#if UPDATE_GOLDEN + (void)kGolden; // Silence warning. + for (size_t i = 0; i < kNumGoldenOutputs; ++i) { + printf("0x%08x, ", engine()); + if (i % 6 == 5) { + printf("\n"); + } + } + printf("\n\n\n"); +#else + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } + engine.seed(seed_sequence); + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } +#endif +} + +TEST(PCG322018EngineTest, VerifyGoldenFromDeserializedEngine) { + constexpr uint64_t kGolden[kNumGoldenOutputs] = { + 0x780f7042, 0xba137215, 0x43ab6f22, 0x0cb55f46, 0x44b2627d, 0x835597af, + 0xea973ea1, 0x0d2abd35, 0x4fdd601c, 0xac4342fe, 0x7db7e93c, 0xe56ebcaf, + 0x3596470a, 0x7770a9ad, 0x9b893320, 0x57db3415, 0xb432de54, 0xa02baf71, + 0xa256aadb, 0x88921fc7, 0xa35fa6b3, 0xde3eca46, 0x605739a7, 0xa890b82b, + 0xe457b7ad, 0x335fb903, 0xeb06790c, 0xb3c54bf6, 0x6141e442, 0xa599a482, + 0xb78987cc, 0xc61dfe9d, 0x0f1d6ace, 0x17460594, 0x8f6a5061, 0x083dc354, + 0xe9c337fb, 0xcfd105f7, 0x926764b6, 0x638d24dc, 0xeaac650a, 0x67d2cb9c, + 0xd807733c, 0x205fc52e, 0xf5399e2e, 0x6c46ddcc, 0xb603e875, 0xce113a25, + 0x3c8d4813, 0xfb584db8, 0xf6d255ff, 0xea80954f, 0x42e8be85, 0xb2feee72, + 0x62bd8d16, 0x1be4a142, 0x97dca1a4, 0xdd6e7333, 0xb2caa20e, 0xa12b1588, + 0xeb3a5a1a, 0x6fa5ba89, 0x077ea931, 0x8ddb1713, 0x0dd03079, 0x2c2ba965, + 0xa77fac17, 0xc8325742, 0x8bb893bf, 0xc2315741, 0xeaceee92, 0x81dd2ee2, + 0xe5214216, 0x1b9b8fb2, 0x01646d03, 0x24facc25, 0xd8c0e0bb, 0xa33fe106, + 0xf34fe976, 0xb3b4b44e, 0x65618fed, 0x032c6192, 0xa9dd72ce, 0xf391887b, + 0xf41c6a6e, 0x05c4bd6d, 0x37fa260e, 0x46b05659, 0xb5f6348a, 0x62d26d89, + 0x39f6452d, 0xb17b30a2, 0xbdd82743, 0x38ecae3b, 0xfe90f0a2, 0xcb2d226d, + 0xcf8a0b1c, 0x0eed3d4d, 0xa1f69cfc, 0xd7ac3ba5, 0xce9d9a6b, 0x121deb4c, + 0x4a0d03f3, 0xc1821ed1, 0x59c249ac, 0xc0abb474, 0x28149985, 0xfd9a82ba, + 0x5960c3b2, 0xeff00cba, 0x6073aa17, 0x25dc0919, 0x9976626e, 0xdd2ccc33, + 0x39ecb6ec, 0xc6e15d13, 0xfac94cfd, 0x28cfd34f, 0xf2d2c32d, 0x51c23d08, + 0x4fdb2f48, 0x97baa807, 0xf2c1004c, 0xc4ae8136, 0x71f31c94, 0x8c92d601, + 0x36caf5cd, + }; + +#if UPDATE_GOLDEN + (void)kGolden; // Silence warning. + std::seed_seq seed_sequence{1, 2, 3}; + pcg32_2018_engine engine(seed_sequence); + std::ostringstream stream; + stream << engine; + auto str = stream.str(); + printf("%s\n\n", str.c_str()); + for (size_t i = 0; i < kNumGoldenOutputs; ++i) { + printf("0x%08x, ", engine()); + if (i % 6 == 5) { + printf("\n"); + } + } + printf("\n\n\n"); + + EXPECT_FALSE(true); +#else + pcg32_2018_engine engine; + std::istringstream stream( + "6364136223846793005 1442695040888963407 6537028157270659894"); + stream >> engine; + for (const auto& elem : kGolden) { + EXPECT_EQ(elem, engine()); + } +#endif +} + +} // namespace -- cgit v1.2.3