1 //===-- Unittests for expm1f-----------------------------------------------===// 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/expm1f.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 LlvmLibcExpm1fTest = LIBC_NAMESPACE::testing::FPTest<float>; 20 21 namespace mpfr = LIBC_NAMESPACE::testing::mpfr; 22 23 TEST_F(LlvmLibcExpm1fTest, SpecialNumbers) { 24 LIBC_NAMESPACE::libc_errno = 0; 25 26 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::expm1f(aNaN)); 27 EXPECT_MATH_ERRNO(0); 28 29 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::expm1f(inf)); 30 EXPECT_MATH_ERRNO(0); 31 32 EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(neg_inf)); 33 EXPECT_MATH_ERRNO(0); 34 35 EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::expm1f(0.0f)); 36 EXPECT_MATH_ERRNO(0); 37 38 EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::expm1f(-0.0f)); 39 EXPECT_MATH_ERRNO(0); 40 } 41 42 TEST_F(LlvmLibcExpm1fTest, Overflow) { 43 LIBC_NAMESPACE::libc_errno = 0; 44 EXPECT_FP_EQ_WITH_EXCEPTION( 45 inf, LIBC_NAMESPACE::expm1f(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW); 46 EXPECT_MATH_ERRNO(ERANGE); 47 48 EXPECT_FP_EQ_WITH_EXCEPTION( 49 inf, LIBC_NAMESPACE::expm1f(FPBits(0x42cffff8U).get_val()), FE_OVERFLOW); 50 EXPECT_MATH_ERRNO(ERANGE); 51 52 EXPECT_FP_EQ_WITH_EXCEPTION( 53 inf, LIBC_NAMESPACE::expm1f(FPBits(0x42d00008U).get_val()), FE_OVERFLOW); 54 EXPECT_MATH_ERRNO(ERANGE); 55 } 56 57 TEST_F(LlvmLibcExpm1fTest, Underflow) { 58 LIBC_NAMESPACE::libc_errno = 0; 59 EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(FPBits(0xff7fffffU).get_val())); 60 61 float x = FPBits(0xc2cffff8U).get_val(); 62 EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(x)); 63 64 x = FPBits(0xc2d00008U).get_val(); 65 EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(x)); 66 } 67 68 // Test with inputs which are the borders of underflow/overflow but still 69 // produce valid results without setting errno. 70 TEST_F(LlvmLibcExpm1fTest, Borderline) { 71 float x; 72 73 LIBC_NAMESPACE::libc_errno = 0; 74 x = FPBits(0x42affff8U).get_val(); 75 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 76 LIBC_NAMESPACE::expm1f(x), 0.5); 77 EXPECT_MATH_ERRNO(0); 78 79 x = FPBits(0x42b00008U).get_val(); 80 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 81 LIBC_NAMESPACE::expm1f(x), 0.5); 82 EXPECT_MATH_ERRNO(0); 83 84 x = FPBits(0xc2affff8U).get_val(); 85 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 86 LIBC_NAMESPACE::expm1f(x), 0.5); 87 EXPECT_MATH_ERRNO(0); 88 89 x = FPBits(0xc2b00008U).get_val(); 90 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 91 LIBC_NAMESPACE::expm1f(x), 0.5); 92 EXPECT_MATH_ERRNO(0); 93 94 x = FPBits(0x3dc252ddU).get_val(); 95 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 96 LIBC_NAMESPACE::expm1f(x), 0.5); 97 EXPECT_MATH_ERRNO(0); 98 99 x = FPBits(0x3e35bec5U).get_val(); 100 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 101 LIBC_NAMESPACE::expm1f(x), 0.5); 102 EXPECT_MATH_ERRNO(0); 103 104 x = FPBits(0x942ed494U).get_val(); 105 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 106 LIBC_NAMESPACE::expm1f(x), 0.5); 107 EXPECT_MATH_ERRNO(0); 108 109 x = FPBits(0xbdc1c6cbU).get_val(); 110 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 111 LIBC_NAMESPACE::expm1f(x), 0.5); 112 EXPECT_MATH_ERRNO(0); 113 } 114 115 TEST_F(LlvmLibcExpm1fTest, InFloatRange) { 116 constexpr uint32_t COUNT = 100'000; 117 constexpr uint32_t STEP = UINT32_MAX / COUNT; 118 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 119 float x = FPBits(v).get_val(); 120 if (FPBits(v).is_nan() || FPBits(v).is_inf()) 121 continue; 122 LIBC_NAMESPACE::libc_errno = 0; 123 float result = LIBC_NAMESPACE::expm1f(x); 124 125 // If the computation resulted in an error or did not produce valid result 126 // in the single-precision floating point range, then ignore comparing with 127 // MPFR result as MPFR can still produce valid results because of its 128 // wider precision. 129 if (FPBits(result).is_nan() || FPBits(result).is_inf() || 130 LIBC_NAMESPACE::libc_errno != 0) 131 continue; 132 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 133 LIBC_NAMESPACE::expm1f(x), 0.5); 134 } 135 } 136