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 "include/errno.h"
10 #include "src/errno/llvmlibc_errno.h"
11 #include "src/math/cosf.h"
12 #include "test/src/math/sdcomp26094.h"
13 #include "utils/CPP/Array.h"
14 #include "utils/FPUtil/BitPatterns.h"
15 #include "utils/FPUtil/ClassificationFunctions.h"
16 #include "utils/FPUtil/FloatOperations.h"
17 #include "utils/FPUtil/FloatProperties.h"
18 #include "utils/MPFRWrapper/MPFRUtils.h"
19 #include "utils/UnitTest/Test.h"
20 #include <math.h>
21
22 #include <stdint.h>
23
24 using __llvm_libc::fputil::isNegativeQuietNaN;
25 using __llvm_libc::fputil::isQuietNaN;
26 using __llvm_libc::fputil::valueAsBits;
27 using __llvm_libc::fputil::valueFromBits;
28
29 using BitPatterns = __llvm_libc::fputil::BitPatterns<float>;
30
31 using __llvm_libc::testing::sdcomp26094Values;
32
33 namespace mpfr = __llvm_libc::testing::mpfr;
34
TEST(CosfTest,SpecialNumbers)35 TEST(CosfTest, SpecialNumbers) {
36 llvmlibc_errno = 0;
37
38 EXPECT_TRUE(
39 isQuietNaN(__llvm_libc::cosf(valueFromBits(BitPatterns::aQuietNaN))));
40 EXPECT_EQ(llvmlibc_errno, 0);
41
42 EXPECT_TRUE(isNegativeQuietNaN(
43 __llvm_libc::cosf(valueFromBits(BitPatterns::aNegativeQuietNaN))));
44 EXPECT_EQ(llvmlibc_errno, 0);
45
46 EXPECT_TRUE(isQuietNaN(
47 __llvm_libc::cosf(valueFromBits(BitPatterns::aSignallingNaN))));
48 EXPECT_EQ(llvmlibc_errno, 0);
49
50 EXPECT_TRUE(isNegativeQuietNaN(
51 __llvm_libc::cosf(valueFromBits(BitPatterns::aNegativeSignallingNaN))));
52 EXPECT_EQ(llvmlibc_errno, 0);
53
54 EXPECT_EQ(BitPatterns::one,
55 valueAsBits(__llvm_libc::cosf(valueFromBits(BitPatterns::zero))));
56 EXPECT_EQ(llvmlibc_errno, 0);
57
58 EXPECT_EQ(BitPatterns::one, valueAsBits(__llvm_libc::cosf(
59 valueFromBits(BitPatterns::negZero))));
60 EXPECT_EQ(llvmlibc_errno, 0);
61
62 llvmlibc_errno = 0;
63 EXPECT_TRUE(isQuietNaN(__llvm_libc::cosf(valueFromBits(BitPatterns::inf))));
64 EXPECT_EQ(llvmlibc_errno, EDOM);
65
66 llvmlibc_errno = 0;
67 EXPECT_TRUE(
68 isQuietNaN(__llvm_libc::cosf(valueFromBits(BitPatterns::negInf))));
69 EXPECT_EQ(llvmlibc_errno, EDOM);
70 }
71
TEST(CosfTest,InFloatRange)72 TEST(CosfTest, InFloatRange) {
73 constexpr uint32_t count = 1000000;
74 constexpr uint32_t step = UINT32_MAX / count;
75 for (uint32_t i = 0, v = 0; i <= count; ++i, v += step) {
76 float x = valueFromBits(v);
77 if (isnan(x) || isinf(x))
78 continue;
79 ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, __llvm_libc::cosf(x), 1.0);
80 }
81 }
82
83 // For small values, cos(x) is 1.
TEST(CosfTest,SmallValues)84 TEST(CosfTest, SmallValues) {
85 float x = valueFromBits(0x17800000U);
86 float result = __llvm_libc::cosf(x);
87 EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result, 1.0);
88 EXPECT_EQ(BitPatterns::one, valueAsBits(result));
89
90 x = valueFromBits(0x0040000U);
91 result = __llvm_libc::cosf(x);
92 EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result, 1.0);
93 EXPECT_EQ(BitPatterns::one, valueAsBits(result));
94 }
95
96 // SDCOMP-26094: check cosf in the cases for which the range reducer
97 // returns values furthest beyond its nominal upper bound of pi/4.
TEST(CosfTest,SDCOMP_26094)98 TEST(CosfTest, SDCOMP_26094) {
99 for (uint32_t v : sdcomp26094Values) {
100 float x = valueFromBits(v);
101 ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, __llvm_libc::cosf(x), 1.0);
102 }
103 }
104