diff options
Diffstat (limited to 'third_party/abseil-cpp/absl/random/exponential_distribution_test.cc')
-rw-r--r-- | third_party/abseil-cpp/absl/random/exponential_distribution_test.cc | 48 |
1 files changed, 25 insertions, 23 deletions
diff --git a/third_party/abseil-cpp/absl/random/exponential_distribution_test.cc b/third_party/abseil-cpp/absl/random/exponential_distribution_test.cc index f3cfd76442..81a5d17bac 100644 --- a/third_party/abseil-cpp/absl/random/exponential_distribution_test.cc +++ b/third_party/abseil-cpp/absl/random/exponential_distribution_test.cc @@ -15,6 +15,7 @@ #include "absl/random/exponential_distribution.h" #include <algorithm> +#include <cfloat> #include <cmath> #include <cstddef> #include <cstdint> @@ -30,8 +31,10 @@ #include "gtest/gtest.h" #include "absl/base/internal/raw_logging.h" #include "absl/base/macros.h" +#include "absl/numeric/internal/representation.h" #include "absl/random/internal/chi_square.h" #include "absl/random/internal/distribution_test_util.h" +#include "absl/random/internal/pcg_engine.h" #include "absl/random/internal/sequence_urbg.h" #include "absl/random/random.h" #include "absl/strings/str_cat.h" @@ -46,11 +49,15 @@ using absl::random_internal::kChiSquared; template <typename RealType> class ExponentialDistributionTypedTest : public ::testing::Test {}; -#if defined(__EMSCRIPTEN__) -using RealTypes = ::testing::Types<float, double>; -#else -using RealTypes = ::testing::Types<float, double, long double>; -#endif // defined(__EMSCRIPTEN__) +// double-double arithmetic is not supported well by either GCC or Clang; see +// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99048, +// https://bugs.llvm.org/show_bug.cgi?id=49131, and +// https://bugs.llvm.org/show_bug.cgi?id=49132. Don't bother running these tests +// with double doubles until compiler support is better. +using RealTypes = + std::conditional<absl::numeric_internal::IsDoubleDouble(), + ::testing::Types<float, double>, + ::testing::Types<float, double, long double>>::type; TYPED_TEST_CASE(ExponentialDistributionTypedTest, RealTypes); TYPED_TEST(ExponentialDistributionTypedTest, SerializeTest) { @@ -129,23 +136,6 @@ TYPED_TEST(ExponentialDistributionTypedTest, SerializeTest) { ss >> after; -#if defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \ - defined(__ppc__) || defined(__PPC__) - if (std::is_same<TypeParam, long double>::value) { - // Roundtripping floating point values requires sufficient precision to - // reconstruct the exact value. It turns out that long double has some - // errors doing this on ppc, particularly for values - // near {1.0 +/- epsilon}. - if (lambda <= std::numeric_limits<double>::max() && - lambda >= std::numeric_limits<double>::lowest()) { - EXPECT_EQ(static_cast<double>(before.lambda()), - static_cast<double>(after.lambda())) - << ss.str(); - } - continue; - } -#endif - EXPECT_EQ(before.lambda(), after.lambda()) // << ss.str() << " " // << (ss.good() ? "good " : "") // @@ -205,7 +195,10 @@ class ExponentialDistributionTests : public testing::TestWithParam<Param>, template <typename D> double SingleChiSquaredTest(); - absl::InsecureBitGen rng_; + // We use a fixed bit generator for distribution accuracy tests. This allows + // these tests to be deterministic, while still testing the qualify of the + // implementation. + absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6}; }; template <typename D> @@ -392,6 +385,15 @@ TEST(ExponentialDistributionTest, StabilityTest) { TEST(ExponentialDistributionTest, AlgorithmBounds) { // Relies on absl::uniform_real_distribution, so some of these comments // reference that. + +#if (defined(__i386__) || defined(_M_IX86)) && FLT_EVAL_METHOD != 0 + // We're using an x87-compatible FPU, and intermediate operations can be + // performed with 80-bit floats. This produces slightly different results from + // what we expect below. + GTEST_SKIP() + << "Skipping the test because we detected x87 floating-point semantics"; +#endif + absl::exponential_distribution<double> dist; { |