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 "src/__support/FPUtil/FPBits.h" 10 #include "src/math/expm1f.h" 11 #include "utils/MPFRWrapper/MPFRUtils.h" 12 #include "utils/UnitTest/FPMatcher.h" 13 #include "utils/UnitTest/Test.h" 14 #include <math.h> 15 16 #include <errno.h> 17 #include <stdint.h> 18 19 namespace mpfr = __llvm_libc::testing::mpfr; 20 21 DECLARE_SPECIAL_CONSTANTS(float) 22 23 TEST(LlvmLibcExpm1fTest, SpecialNumbers) { 24 errno = 0; 25 26 EXPECT_FP_EQ(aNaN, __llvm_libc::expm1f(aNaN)); 27 EXPECT_MATH_ERRNO(0); 28 29 EXPECT_FP_EQ(inf, __llvm_libc::expm1f(inf)); 30 EXPECT_MATH_ERRNO(0); 31 32 EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(neg_inf)); 33 EXPECT_MATH_ERRNO(0); 34 35 EXPECT_FP_EQ(0.0f, __llvm_libc::expm1f(0.0f)); 36 EXPECT_MATH_ERRNO(0); 37 38 EXPECT_FP_EQ(-0.0f, __llvm_libc::expm1f(-0.0f)); 39 EXPECT_MATH_ERRNO(0); 40 } 41 42 TEST(LlvmLibcExpm1fTest, Overflow) { 43 errno = 0; 44 EXPECT_FP_EQ(inf, __llvm_libc::expm1f(float(FPBits(0x7f7fffffU)))); 45 EXPECT_MATH_ERRNO(ERANGE); 46 47 EXPECT_FP_EQ(inf, __llvm_libc::expm1f(float(FPBits(0x42cffff8U)))); 48 EXPECT_MATH_ERRNO(ERANGE); 49 50 EXPECT_FP_EQ(inf, __llvm_libc::expm1f(float(FPBits(0x42d00008U)))); 51 EXPECT_MATH_ERRNO(ERANGE); 52 } 53 54 TEST(LlvmLibcExpm1fTest, Underflow) { 55 errno = 0; 56 EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(float(FPBits(0xff7fffffU)))); 57 58 float x = float(FPBits(0xc2cffff8U)); 59 EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(x)); 60 61 x = float(FPBits(0xc2d00008U)); 62 EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(x)); 63 } 64 65 // Test with inputs which are the borders of underflow/overflow but still 66 // produce valid results without setting errno. 67 TEST(LlvmLibcExpm1fTest, Borderline) { 68 float x; 69 70 errno = 0; 71 x = float(FPBits(0x42affff8U)); 72 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 73 __llvm_libc::expm1f(x), 0.5); 74 EXPECT_MATH_ERRNO(0); 75 76 x = float(FPBits(0x42b00008U)); 77 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 78 __llvm_libc::expm1f(x), 0.5); 79 EXPECT_MATH_ERRNO(0); 80 81 x = float(FPBits(0xc2affff8U)); 82 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 83 __llvm_libc::expm1f(x), 0.5); 84 EXPECT_MATH_ERRNO(0); 85 86 x = float(FPBits(0xc2b00008U)); 87 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 88 __llvm_libc::expm1f(x), 0.5); 89 EXPECT_MATH_ERRNO(0); 90 91 x = float(FPBits(0x3dc252ddU)); 92 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 93 __llvm_libc::expm1f(x), 0.5); 94 EXPECT_MATH_ERRNO(0); 95 96 x = float(FPBits(0x3e35bec5U)); 97 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 98 __llvm_libc::expm1f(x), 0.5); 99 EXPECT_MATH_ERRNO(0); 100 101 x = float(FPBits(0x942ed494U)); 102 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 103 __llvm_libc::expm1f(x), 0.5); 104 EXPECT_MATH_ERRNO(0); 105 106 x = float(FPBits(0xbdc1c6cbU)); 107 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 108 __llvm_libc::expm1f(x), 0.5); 109 EXPECT_MATH_ERRNO(0); 110 } 111 112 TEST(LlvmLibcExpm1fTest, InFloatRange) { 113 constexpr uint32_t COUNT = 1000000; 114 constexpr uint32_t STEP = UINT32_MAX / COUNT; 115 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 116 float x = float(FPBits(v)); 117 if (isnan(x) || isinf(x)) 118 continue; 119 errno = 0; 120 float result = __llvm_libc::expm1f(x); 121 122 // If the computation resulted in an error or did not produce valid result 123 // in the single-precision floating point range, then ignore comparing with 124 // MPFR result as MPFR can still produce valid results because of its 125 // wider precision. 126 if (isnan(result) || isinf(result) || errno != 0) 127 continue; 128 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x, 129 __llvm_libc::expm1f(x), 0.5); 130 } 131 } 132