derek.holloway
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68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// Do not attempt to use LLVM ostream etc from gtest.
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// #define GTEST_NO_LLVM_SUPPORT 1
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#include "../nsan.h"
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#include "gtest/gtest.h"
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#include <cmath>
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namespace __nsan {
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template <typename FT, auto next> void TestFT() {
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// Basic local tests anchored at 0.0.
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ASSERT_EQ(GetULPDiff<FT>(0.0, 0.0), 0);
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ASSERT_EQ(GetULPDiff<FT>(-0.0, 0.0), 0);
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ASSERT_EQ(GetULPDiff<FT>(next(-0.0, -1.0), 0.0), 1);
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ASSERT_EQ(GetULPDiff<FT>(next(0.0, 1.0), -0.0), 1);
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ASSERT_EQ(GetULPDiff<FT>(next(-0.0, -1.0), next(0.0, 1.0)), 2);
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// Basic local tests anchored at 2.0.
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ASSERT_EQ(GetULPDiff<FT>(next(2.0, 1.0), 2.0), 1);
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ASSERT_EQ(GetULPDiff<FT>(next(2.0, 3.0), 2.0), 1);
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ASSERT_EQ(GetULPDiff<FT>(next(2.0, 1.0), next(2.0, 3.0)), 2);
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ASSERT_NE(GetULPDiff<FT>(-0.01, 0.01), kMaxULPDiff);
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// Basic local tests anchored at a random number.
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const FT X = 4863.5123;
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const FT To = 2 * X;
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FT Y = X;
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ASSERT_EQ(GetULPDiff<FT>(X, Y), 0);
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ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 0);
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Y = next(Y, To);
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ASSERT_EQ(GetULPDiff<FT>(X, Y), 1);
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ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 1);
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Y = next(Y, To);
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ASSERT_EQ(GetULPDiff<FT>(X, Y), 2);
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ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 2);
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Y = next(Y, To);
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ASSERT_EQ(GetULPDiff<FT>(X, Y), 3);
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ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 3);
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// Values with larger differences.
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static constexpr const __sanitizer::u64 MantissaSize =
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__sanitizer::u64{1} << FTInfo<FT>::kMantissaBits;
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ASSERT_EQ(GetULPDiff<FT>(1.0, next(2.0, 1.0)), MantissaSize - 1);
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ASSERT_EQ(GetULPDiff<FT>(1.0, 2.0), MantissaSize);
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ASSERT_EQ(GetULPDiff<FT>(1.0, next(2.0, 3.0)), MantissaSize + 1);
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ASSERT_EQ(GetULPDiff<FT>(1.0, 3.0), (3 * MantissaSize) / 2);
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}
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TEST(NSanTest, Float) { TestFT<float, nextafterf>(); }
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TEST(NSanTest, Double) {
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TestFT<double, static_cast<double (*)(double, double)>(nextafter)>();
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}
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TEST(NSanTest, Float128) {
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// Very basic tests. FIXME: improve when we have nextafter<__float128>.
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ASSERT_EQ(GetULPDiff<__float128>(0.0, 0.0), 0);
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ASSERT_EQ(GetULPDiff<__float128>(-0.0, 0.0), 0);
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ASSERT_NE(GetULPDiff<__float128>(-0.01, 0.01), kMaxULPDiff);
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}
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} // end namespace __nsan
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