1 //===-- Unittests for cosf ------------------------------------------------===// 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/cosf.h" 13 #include "test/UnitTest/FPMatcher.h" 14 #include "test/UnitTest/Test.h" 15 #include "test/src/math/sdcomp26094.h" 16 #include "utils/MPFRWrapper/MPFRUtils.h" 17 18 #include <stdint.h> 19 20 using LIBC_NAMESPACE::testing::SDCOMP26094_VALUES; 21 using LlvmLibcCosfTest = LIBC_NAMESPACE::testing::FPTest<float>; 22 23 namespace mpfr = LIBC_NAMESPACE::testing::mpfr; 24 25 TEST_F(LlvmLibcCosfTest, SpecialNumbers) { 26 LIBC_NAMESPACE::libc_errno = 0; 27 28 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::cosf(aNaN)); 29 EXPECT_MATH_ERRNO(0); 30 31 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::cosf(0.0f)); 32 EXPECT_MATH_ERRNO(0); 33 34 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::cosf(-0.0f)); 35 EXPECT_MATH_ERRNO(0); 36 37 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::cosf(inf)); 38 EXPECT_MATH_ERRNO(EDOM); 39 40 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::cosf(neg_inf)); 41 EXPECT_MATH_ERRNO(EDOM); 42 } 43 44 TEST_F(LlvmLibcCosfTest, InFloatRange) { 45 constexpr uint32_t COUNT = 100'000; 46 constexpr uint32_t STEP = UINT32_MAX / COUNT; 47 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 48 float x = FPBits(v).get_val(); 49 if (FPBits(v).is_nan() || FPBits(v).is_inf()) 50 continue; 51 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Cos, x, 52 LIBC_NAMESPACE::cosf(x), 0.5); 53 } 54 } 55 56 TEST_F(LlvmLibcCosfTest, SpecificBitPatterns) { 57 constexpr int N = 42; 58 constexpr uint32_t INPUTS[N] = { 59 0x3f06'0a92U, // x = pi/6 60 0x3f3a'dc51U, // x = 0x1.75b8a2p-1f 61 0x3f49'0fdbU, // x = pi/4 62 0x3f86'0a92U, // x = pi/3 63 0x3fa7'832aU, // x = 0x1.4f0654p+0f 64 0x3fc9'0fdbU, // x = pi/2 65 0x4017'1973U, // x = 0x1.2e32e6p+1f 66 0x4049'0fdbU, // x = pi 67 0x4096'cbe4U, // x = 0x1.2d97c8p+2f 68 0x40c9'0fdbU, // x = 2*pi 69 0x433b'7490U, // x = 0x1.76e92p+7f 70 0x437c'e5f1U, // x = 0x1.f9cbe2p+7f 71 0x4619'9998U, // x = 0x1.33333p+13f 72 0x474d'246fU, // x = 0x1.9a48dep+15f 73 0x4afd'ece4U, // x = 0x1.fbd9c8p+22f 74 0x4c23'32e9U, // x = 0x1.4665d2p+25f 75 0x50a3'e87fU, // x = 0x1.47d0fep+34f 76 0x5239'47f6U, // x = 0x1.728fecp+37f 77 0x53b1'46a6U, // x = 0x1.628d4cp+40f 78 0x5532'5019U, // x = 0x1.64a032p+43f 79 0x55ca'fb2aU, // x = 0x1.95f654p+44f 80 0x588e'f060U, // x = 0x1.1de0cp+50f 81 0x5922'aa80U, // x = 0x1.4555p+51f 82 0x5aa4'542cU, // x = 0x1.48a858p+54f 83 0x5c07'bcd0U, // x = 0x1.0f79ap+57f 84 0x5ebc'fddeU, // x = 0x1.79fbbcp+62f 85 0x5f18'b878U, // x = 0x1.3170fp+63f 86 0x5fa6'eba7U, // x = 0x1.4dd74ep+64f 87 0x6115'cb11U, // x = 0x1.2b9622p+67f 88 0x61a4'0b40U, // x = 0x1.48168p+68f 89 0x6386'134eU, // x = 0x1.0c269cp+72f 90 0x6589'8498U, // x = 0x1.13093p+76f 91 0x6600'0001U, // x = 0x1.000002p+77f 92 0x664e'46e4U, // x = 0x1.9c8dc8p+77f 93 0x66b0'14aaU, // x = 0x1.602954p+78f 94 0x67a9'242bU, // x = 0x1.524856p+80f 95 0x6a19'76f1U, // x = 0x1.32ede2p+85f 96 0x6c55'da58U, // x = 0x1.abb4bp+89f 97 0x6f79'be45U, // x = 0x1.f37c8ap+95f 98 0x7276'69d4U, // x = 0x1.ecd3a8p+101f 99 0x7758'4625U, // x = 0x1.b08c4ap+111f 100 0x7bee'f5efU, // x = 0x1.ddebdep+120f 101 }; 102 103 for (int i = 0; i < N; ++i) { 104 float x = FPBits(INPUTS[i]).get_val(); 105 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Cos, x, 106 LIBC_NAMESPACE::cosf(x), 0.5); 107 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Cos, -x, 108 LIBC_NAMESPACE::cosf(-x), 0.5); 109 } 110 } 111 112 // SDCOMP-26094: check cosf in the cases for which the range reducer 113 // returns values furthest beyond its nominal upper bound of pi/4. 114 TEST_F(LlvmLibcCosfTest, SDCOMP_26094) { 115 for (uint32_t v : SDCOMP26094_VALUES) { 116 float x = FPBits(v).get_val(); 117 ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, LIBC_NAMESPACE::cosf(x), 0.5); 118 } 119 } 120