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/__support/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
20using LIBC_NAMESPACE::testing::SDCOMP26094_VALUES;
21using LlvmLibcCosfTest = LIBC_NAMESPACE::testing::FPTest<float>;
22
23namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
24
25TEST_F(LlvmLibcCosfTest, SpecialNumbers) {
26 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
44TEST_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
56TEST_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.
114TEST_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

source code of libc/test/src/math/cosf_test.cpp