140 lines
6.1 KiB
C++
140 lines
6.1 KiB
C++
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// Copyright Catch2 Authors
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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// SPDX-License-Identifier: BSL-1.0
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/catch_template_test_macros.hpp>
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#include <catch2/internal/catch_floating_point_helpers.hpp>
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#include <catch2/internal/catch_random_floating_point_helpers.hpp>
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#include <limits>
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TEST_CASE("convertToBits", "[floating-point][conversion]") {
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using Catch::Detail::convertToBits;
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CHECK( convertToBits( 0.f ) == 0 );
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CHECK( convertToBits( -0.f ) == ( 1ULL << 31 ) );
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CHECK( convertToBits( 0. ) == 0 );
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CHECK( convertToBits( -0. ) == ( 1ULL << 63 ) );
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CHECK( convertToBits( std::numeric_limits<float>::denorm_min() ) == 1 );
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CHECK( convertToBits( std::numeric_limits<double>::denorm_min() ) == 1 );
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}
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TEMPLATE_TEST_CASE("type-shared ulpDistance tests", "[floating-point][ulp][approvals]", float, double) {
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using FP = TestType;
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using Catch::ulpDistance;
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// Distance between zeros is zero
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CHECK( ulpDistance( FP{}, FP{} ) == 0 );
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CHECK( ulpDistance( FP{}, -FP{} ) == 0 );
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CHECK( ulpDistance( -FP{}, -FP{} ) == 0 );
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// Distance between same-sign infinities is zero
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static constexpr FP infinity = std::numeric_limits<FP>::infinity();
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CHECK( ulpDistance( infinity, infinity ) == 0 );
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CHECK( ulpDistance( -infinity, -infinity ) == 0 );
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// Distance between max-finite-val and same sign infinity is 1
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static constexpr FP max_finite = std::numeric_limits<FP>::max();
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CHECK( ulpDistance( max_finite, infinity ) == 1 );
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CHECK( ulpDistance( -max_finite, -infinity ) == 1 );
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// Distance between X and 0 is half of distance between X and -X
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CHECK( ulpDistance( -infinity, infinity ) ==
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2 * ulpDistance( infinity, FP{} ) );
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CHECK( 2 * ulpDistance( FP{ -2. }, FP{} ) ==
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ulpDistance( FP{ -2. }, FP{ 2. } ) );
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CHECK( 2 * ulpDistance( FP{ 2. }, FP{} ) ==
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ulpDistance( FP{ -2. }, FP{ 2. } ) );
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// Denorms are supported
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CHECK( ulpDistance( std::numeric_limits<FP>::denorm_min(), FP{} ) == 1 );
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CHECK( ulpDistance( std::numeric_limits<FP>::denorm_min(), -FP{} ) == 1 );
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CHECK( ulpDistance( -std::numeric_limits<FP>::denorm_min(), FP{} ) == 1 );
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CHECK( ulpDistance( -std::numeric_limits<FP>::denorm_min(), -FP{} ) == 1 );
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CHECK( ulpDistance( std::numeric_limits<FP>::denorm_min(),
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-std::numeric_limits<FP>::denorm_min() ) == 2 );
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// Machine epsilon
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CHECK( ulpDistance( FP{ 1. },
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FP{ 1. } + std::numeric_limits<FP>::epsilon() ) == 1 );
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CHECK( ulpDistance( -FP{ 1. },
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-FP{ 1. } - std::numeric_limits<FP>::epsilon() ) == 1 );
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}
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TEST_CASE("UlpDistance", "[floating-point][ulp][approvals]") {
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using Catch::ulpDistance;
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CHECK( ulpDistance( 1., 2. ) == 0x10'00'00'00'00'00'00 );
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CHECK( ulpDistance( -2., 2. ) == 0x80'00'00'00'00'00'00'00 );
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CHECK( ulpDistance( 1.f, 2.f ) == 0x80'00'00 );
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CHECK( ulpDistance( -2.f, 2.f ) == 0x80'00'00'00 );
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}
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TEMPLATE_TEST_CASE("gamma", "[approvals][floating-point][ulp][gamma]", float, double) {
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using Catch::Detail::gamma;
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using Catch::Detail::directCompare;
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// We need to butcher the equal tests with the directCompare helper,
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// because the Wfloat-equal triggers in decomposer rather than here,
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// so we cannot locally disable it. Goddamn GCC.
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CHECK( directCompare( gamma( TestType( -1. ), TestType( 1. ) ),
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gamma( TestType( 0.2332 ), TestType( 1.0 ) ) ) );
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CHECK( directCompare( gamma( TestType( -2. ), TestType( 0 ) ),
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gamma( TestType( 1. ), TestType( 1.5 ) ) ) );
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CHECK( gamma( TestType( 0. ), TestType( 1.0 ) ) <
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gamma( TestType( 1.0 ), TestType( 1.5 ) ) );
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CHECK( gamma( TestType( 0 ), TestType( 1. ) ) <
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std::numeric_limits<TestType>::epsilon() );
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CHECK( gamma( TestType( -1. ), TestType( -0. ) ) <
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std::numeric_limits<TestType>::epsilon() );
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CHECK( directCompare( gamma( TestType( 1. ), TestType( 2. ) ),
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std::numeric_limits<TestType>::epsilon() ) );
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CHECK( directCompare( gamma( TestType( -2. ), TestType( -1. ) ),
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std::numeric_limits<TestType>::epsilon() ) );
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}
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TEMPLATE_TEST_CASE("count_equidistant_floats",
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"[approvals][floating-point][distance]",
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float,
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double) {
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using Catch::Detail::count_equidistant_floats;
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auto count_steps = []( TestType a, TestType b ) {
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return count_equidistant_floats( a, b, Catch::Detail::gamma( a, b ) );
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};
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CHECK( count_steps( TestType( -1. ), TestType( 1. ) ) ==
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2 * count_steps( TestType( 0. ), TestType( 1. ) ) );
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}
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TEST_CASE( "count_equidistant_floats",
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"[approvals][floating-point][distance]" ) {
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using Catch::Detail::count_equidistant_floats;
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auto count_floats_with_scaled_ulp = []( auto a, auto b ) {
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return count_equidistant_floats( a, b, Catch::Detail::gamma( a, b ) );
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};
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CHECK( count_floats_with_scaled_ulp( 1., 1.5 ) == 1ull << 51 );
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CHECK( count_floats_with_scaled_ulp( 1.25, 1.5 ) == 1ull << 50 );
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CHECK( count_floats_with_scaled_ulp( 1.f, 1.5f ) == 1 << 22 );
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CHECK( count_floats_with_scaled_ulp( -std::numeric_limits<float>::max(),
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std::numeric_limits<float>::max() ) ==
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33554430 ); // (1 << 25) - 2 due to not including infinities
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CHECK( count_floats_with_scaled_ulp( -std::numeric_limits<double>::max(),
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std::numeric_limits<double>::max() ) ==
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18014398509481982 ); // (1 << 54) - 2 due to not including infinities
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STATIC_REQUIRE( std::is_same<std::uint64_t,
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decltype( count_floats_with_scaled_ulp(
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0., 1. ) )>::value );
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STATIC_REQUIRE( std::is_same<std::uint32_t,
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decltype( count_floats_with_scaled_ulp(
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0.f, 1.f ) )>::value );
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}
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