| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 2 | // See https://llvm.org/LICENSE.txt for license information. |
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| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 4 | |
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| 5 | // Do not attempt to use LLVM ostream etc from gtest. |
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| 6 | // #define GTEST_NO_LLVM_SUPPORT 1 |
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| 7 | |
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| 8 | #include "../nsan.h" |
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| 9 | #include "gtest/gtest.h" |
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| 10 | |
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| 11 | #include <cmath> |
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| 12 | |
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| 13 | namespace __nsan { |
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| 14 | |
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| 15 | template <typename FT, auto next> void TestFT() { |
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| 16 | // Basic local tests anchored at 0.0. |
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| 17 | ASSERT_EQ(GetULPDiff<FT>(0.0, 0.0), 0); |
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| 18 | ASSERT_EQ(GetULPDiff<FT>(-0.0, 0.0), 0); |
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| 19 | ASSERT_EQ(GetULPDiff<FT>(next(-0.0, -1.0), 0.0), 1); |
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| 20 | ASSERT_EQ(GetULPDiff<FT>(next(0.0, 1.0), -0.0), 1); |
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| 21 | ASSERT_EQ(GetULPDiff<FT>(next(-0.0, -1.0), next(0.0, 1.0)), 2); |
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| 22 | // Basic local tests anchored at 2.0. |
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| 23 | ASSERT_EQ(GetULPDiff<FT>(next(2.0, 1.0), 2.0), 1); |
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| 24 | ASSERT_EQ(GetULPDiff<FT>(next(2.0, 3.0), 2.0), 1); |
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| 25 | ASSERT_EQ(GetULPDiff<FT>(next(2.0, 1.0), next(2.0, 3.0)), 2); |
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| 26 | |
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| 27 | ASSERT_NE(GetULPDiff<FT>(-0.01, 0.01), kMaxULPDiff); |
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| 28 | |
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| 29 | // Basic local tests anchored at a random number. |
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| 30 | const FT X = 4863.5123; |
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| 31 | const FT To = 2 * X; |
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| 32 | FT Y = X; |
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| 33 | ASSERT_EQ(GetULPDiff<FT>(X, Y), 0); |
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| 34 | ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 0); |
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| 35 | Y = next(Y, To); |
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| 36 | ASSERT_EQ(GetULPDiff<FT>(X, Y), 1); |
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| 37 | ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 1); |
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| 38 | Y = next(Y, To); |
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| 39 | ASSERT_EQ(GetULPDiff<FT>(X, Y), 2); |
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| 40 | ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 2); |
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| 41 | Y = next(Y, To); |
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| 42 | ASSERT_EQ(GetULPDiff<FT>(X, Y), 3); |
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| 43 | ASSERT_EQ(GetULPDiff<FT>(-X, -Y), 3); |
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| 44 | |
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| 45 | // Values with larger differences. |
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| 46 | static constexpr const __sanitizer::u64 MantissaSize = |
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| 47 | __sanitizer::u64{1} << FTInfo<FT>::kMantissaBits; |
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| 48 | ASSERT_EQ(GetULPDiff<FT>(1.0, next(2.0, 1.0)), MantissaSize - 1); |
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| 49 | ASSERT_EQ(GetULPDiff<FT>(1.0, 2.0), MantissaSize); |
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| 50 | ASSERT_EQ(GetULPDiff<FT>(1.0, next(2.0, 3.0)), MantissaSize + 1); |
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| 51 | ASSERT_EQ(GetULPDiff<FT>(1.0, 3.0), (3 * MantissaSize) / 2); |
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| 52 | } |
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| 53 | |
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| 54 | TEST(NSanTest, Float) { TestFT<float, nextafterf>(); } |
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| 55 | |
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| 56 | TEST(NSanTest, Double) { |
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| 57 | TestFT<double, static_cast<double (*)(double, double)>(nextafter)>(); |
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| 58 | } |
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| 59 | |
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| 60 | TEST(NSanTest, Float128) { |
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| 61 | // Very basic tests. FIXME: improve when we have nextafter<__float128>. |
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| 62 | ASSERT_EQ(GetULPDiff<__float128>(v1: 0.0, v2: 0.0), 0); |
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| 63 | ASSERT_EQ(GetULPDiff<__float128>(v1: -0.0, v2: 0.0), 0); |
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| 64 | ASSERT_NE(GetULPDiff<__float128>(v1: -0.01, v2: 0.01), kMaxULPDiff); |
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| 65 | } |
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| 66 | |
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| 67 | } // end namespace __nsan |
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| 68 | |
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