1 //===-- Unittests for exp10f ----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "hdr/math_macros.h" 10 #include "src/__support/FPUtil/FPBits.h" 11 #include "src/errno/libc_errno.h" 12 #include "src/math/exp10f.h" 13 #include "test/UnitTest/FPMatcher.h" 14 #include "test/UnitTest/Test.h" 15 #include "utils/MPFRWrapper/MPFRUtils.h" 16 17 #include <stdint.h> 18 19 using LlvmLibcExp10fTest = LIBC_NAMESPACE::testing::FPTest<float>; 20 21 namespace mpfr = LIBC_NAMESPACE::testing::mpfr; 22 23 TEST_F(LlvmLibcExp10fTest, SpecialNumbers) { 24 LIBC_NAMESPACE::libc_errno = 0; 25 26 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::exp10f(aNaN)); 27 EXPECT_MATH_ERRNO(0); 28 29 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::exp10f(inf)); 30 EXPECT_MATH_ERRNO(0); 31 32 EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::exp10f(neg_inf)); 33 EXPECT_MATH_ERRNO(0); 34 35 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp10f(0.0f)); 36 EXPECT_MATH_ERRNO(0); 37 38 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp10f(-0.0f)); 39 EXPECT_MATH_ERRNO(0); 40 } 41 42 TEST_F(LlvmLibcExp10fTest, Overflow) { 43 LIBC_NAMESPACE::libc_errno = 0; 44 EXPECT_FP_EQ_WITH_EXCEPTION( 45 inf, LIBC_NAMESPACE::exp10f(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW); 46 EXPECT_MATH_ERRNO(ERANGE); 47 48 EXPECT_FP_EQ_WITH_EXCEPTION( 49 inf, LIBC_NAMESPACE::exp10f(FPBits(0x43000000U).get_val()), FE_OVERFLOW); 50 EXPECT_MATH_ERRNO(ERANGE); 51 52 EXPECT_FP_EQ_WITH_EXCEPTION( 53 inf, LIBC_NAMESPACE::exp10f(FPBits(0x43000001U).get_val()), FE_OVERFLOW); 54 EXPECT_MATH_ERRNO(ERANGE); 55 } 56 57 TEST_F(LlvmLibcExp10fTest, Underflow) { 58 LIBC_NAMESPACE::libc_errno = 0; 59 EXPECT_FP_EQ_WITH_EXCEPTION( 60 0.0f, LIBC_NAMESPACE::exp10f(FPBits(0xff7fffffU).get_val()), 61 FE_UNDERFLOW); 62 EXPECT_MATH_ERRNO(ERANGE); 63 64 float x = FPBits(0xc2cffff8U).get_val(); 65 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, x, 66 LIBC_NAMESPACE::exp10f(x), 0.5); 67 EXPECT_MATH_ERRNO(ERANGE); 68 69 x = FPBits(0xc2d00008U).get_val(); 70 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, x, 71 LIBC_NAMESPACE::exp10f(x), 0.5); 72 EXPECT_MATH_ERRNO(ERANGE); 73 } 74 75 TEST_F(LlvmLibcExp10fTest, TrickyInputs) { 76 constexpr int N = 20; 77 constexpr uint32_t INPUTS[N] = { 78 0x325e5bd8, // x = 0x1.bcb7bp-27f 79 0x325e5bd9, // x = 0x1.bcb7b2p-27f 80 0x325e5bda, // x = 0x1.bcb7b4p-27f 81 0x3d14d956, // x = 0x1.29b2acp-5f 82 0x4116498a, // x = 0x1.2c9314p3f 83 0x4126f431, // x = 0x1.4de862p3f 84 0x4187d13c, // x = 0x1.0fa278p4f 85 0x4203e9da, // x = 0x1.07d3b4p5f 86 0x420b5f5d, // x = 0x1.16bebap5f 87 0x42349e35, // x = 0x1.693c6ap5f 88 0x3f800000, // x = 1.0f 89 0x40000000, // x = 2.0f 90 0x40400000, // x = 3.0f 91 0x40800000, // x = 4.0f 92 0x40a00000, // x = 5.0f 93 0x40c00000, // x = 6.0f 94 0x40e00000, // x = 7.0f 95 0x41000000, // x = 8.0f 96 0x41100000, // x = 9.0f 97 0x41200000, // x = 10.0f 98 }; 99 for (int i = 0; i < N; ++i) { 100 LIBC_NAMESPACE::libc_errno = 0; 101 float x = FPBits(INPUTS[i]).get_val(); 102 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, x, 103 LIBC_NAMESPACE::exp10f(x), 0.5); 104 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, -x, 105 LIBC_NAMESPACE::exp10f(-x), 0.5); 106 } 107 } 108 109 TEST_F(LlvmLibcExp10fTest, InFloatRange) { 110 constexpr uint32_t COUNT = 100'000; 111 constexpr uint32_t STEP = UINT32_MAX / COUNT; 112 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 113 float x = FPBits(v).get_val(); 114 if (FPBits(v).is_nan() || FPBits(v).is_inf()) 115 continue; 116 LIBC_NAMESPACE::libc_errno = 0; 117 float result = LIBC_NAMESPACE::exp10f(x); 118 119 // If the computation resulted in an error or did not produce valid result 120 // in the single-precision floating point range, then ignore comparing with 121 // MPFR result as MPFR can still produce valid results because of its 122 // wider precision. 123 if (FPBits(result).is_nan() || FPBits(result).is_inf() || 124 LIBC_NAMESPACE::libc_errno != 0) 125 continue; 126 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, x, 127 LIBC_NAMESPACE::exp10f(x), 0.5); 128 } 129 } 130