1 //===-- Unittests for exp2f -----------------------------------------------===// 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/exp2f.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 LlvmLibcExp2fTest = LIBC_NAMESPACE::testing::FPTest<float>; 20 21 namespace mpfr = LIBC_NAMESPACE::testing::mpfr; 22 23 TEST_F(LlvmLibcExp2fTest, SpecialNumbers) { 24 LIBC_NAMESPACE::libc_errno = 0; 25 26 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::exp2f(aNaN)); 27 EXPECT_MATH_ERRNO(0); 28 29 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::exp2f(inf)); 30 EXPECT_MATH_ERRNO(0); 31 32 EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::exp2f(neg_inf)); 33 EXPECT_MATH_ERRNO(0); 34 35 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp2f(0.0f)); 36 EXPECT_MATH_ERRNO(0); 37 38 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp2f(-0.0f)); 39 EXPECT_MATH_ERRNO(0); 40 } 41 42 TEST_F(LlvmLibcExp2fTest, Overflow) { 43 LIBC_NAMESPACE::libc_errno = 0; 44 EXPECT_FP_EQ_WITH_EXCEPTION( 45 inf, LIBC_NAMESPACE::exp2f(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW); 46 EXPECT_MATH_ERRNO(ERANGE); 47 48 EXPECT_FP_EQ_WITH_EXCEPTION( 49 inf, LIBC_NAMESPACE::exp2f(FPBits(0x43000000U).get_val()), FE_OVERFLOW); 50 EXPECT_MATH_ERRNO(ERANGE); 51 52 EXPECT_FP_EQ_WITH_EXCEPTION( 53 inf, LIBC_NAMESPACE::exp2f(FPBits(0x43000001U).get_val()), FE_OVERFLOW); 54 EXPECT_MATH_ERRNO(ERANGE); 55 } 56 57 TEST_F(LlvmLibcExp2fTest, TrickyInputs) { 58 constexpr int N = 12; 59 constexpr uint32_t INPUTS[N] = { 60 0x3b429d37U, /*0x1.853a6ep-9f*/ 61 0x3c02a9adU, /*0x1.05535ap-7f*/ 62 0x3ca66e26U, /*0x1.4cdc4cp-6f*/ 63 0x3d92a282U, /*0x1.254504p-4f*/ 64 0x42fa0001U, /*0x1.f40002p+6f*/ 65 0x42ffffffU, /*0x1.fffffep+6f*/ 66 0xb8d3d026U, /*-0x1.a7a04cp-14f*/ 67 0xbcf3a937U, /*-0x1.e7526ep-6f*/ 68 0xc2fa0001U, /*-0x1.f40002p+6f*/ 69 0xc2fc0000U, /*-0x1.f8p+6f*/ 70 0xc2fc0001U, /*-0x1.f80002p+6f*/ 71 0xc3150000U, /*-0x1.2ap+7f*/ 72 }; 73 for (int i = 0; i < N; ++i) { 74 LIBC_NAMESPACE::libc_errno = 0; 75 float x = FPBits(INPUTS[i]).get_val(); 76 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 77 LIBC_NAMESPACE::exp2f(x), 0.5); 78 EXPECT_MATH_ERRNO(0); 79 } 80 } 81 82 TEST_F(LlvmLibcExp2fTest, Underflow) { 83 LIBC_NAMESPACE::libc_errno = 0; 84 EXPECT_FP_EQ_WITH_EXCEPTION( 85 0.0f, LIBC_NAMESPACE::exp2f(FPBits(0xff7fffffU).get_val()), FE_UNDERFLOW); 86 EXPECT_MATH_ERRNO(ERANGE); 87 88 float x = FPBits(0xc3158000U).get_val(); 89 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 90 LIBC_NAMESPACE::exp2f(x), 0.5); 91 EXPECT_MATH_ERRNO(0); 92 93 x = FPBits(0xc3160000U).get_val(); 94 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 95 LIBC_NAMESPACE::exp2f(x), 0.5); 96 EXPECT_MATH_ERRNO(ERANGE); 97 98 x = FPBits(0xc3165432U).get_val(); 99 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 100 LIBC_NAMESPACE::exp2f(x), 0.5); 101 EXPECT_MATH_ERRNO(ERANGE); 102 } 103 104 TEST_F(LlvmLibcExp2fTest, InFloatRange) { 105 constexpr uint32_t COUNT = 100'000; 106 constexpr uint32_t STEP = UINT32_MAX / COUNT; 107 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 108 float x = FPBits(v).get_val(); 109 if (FPBits(v).is_nan() || FPBits(v).is_inf()) 110 continue; 111 LIBC_NAMESPACE::libc_errno = 0; 112 float result = LIBC_NAMESPACE::exp2f(x); 113 114 // If the computation resulted in an error or did not produce valid result 115 // in the single-precision floating point range, then ignore comparing with 116 // MPFR result as MPFR can still produce valid results because of its 117 // wider precision. 118 if (FPBits(result).is_nan() || FPBits(result).is_inf() || 119 LIBC_NAMESPACE::libc_errno != 0) 120 continue; 121 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 122 LIBC_NAMESPACE::exp2f(x), 0.5); 123 } 124 } 125