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 "src/__support/CPP/Array.h"
10 #include "src/__support/FPUtil/FPBits.h"
11 #include "src/math/cosf.h"
12 #include "test/src/math/sdcomp26094.h"
13 #include "utils/MPFRWrapper/MPFRUtils.h"
14 #include "utils/UnitTest/FPMatcher.h"
15 #include "utils/UnitTest/Test.h"
16 #include <math.h>
17
18 #include <errno.h>
19 #include <stdint.h>
20
21 using __llvm_libc::testing::SDCOMP26094_VALUES;
22 using FPBits = __llvm_libc::fputil::FPBits<float>;
23
24 namespace mpfr = __llvm_libc::testing::mpfr;
25
26 DECLARE_SPECIAL_CONSTANTS(float)
27
TEST(LlvmLibcCosfTest,SpecialNumbers)28 TEST(LlvmLibcCosfTest, SpecialNumbers) {
29 errno = 0;
30
31 EXPECT_FP_EQ(aNaN, __llvm_libc::cosf(aNaN));
32 EXPECT_MATH_ERRNO(0);
33
34 EXPECT_FP_EQ(1.0f, __llvm_libc::cosf(0.0f));
35 EXPECT_MATH_ERRNO(0);
36
37 EXPECT_FP_EQ(1.0f, __llvm_libc::cosf(-0.0f));
38 EXPECT_MATH_ERRNO(0);
39
40 EXPECT_FP_EQ(aNaN, __llvm_libc::cosf(inf));
41 EXPECT_MATH_ERRNO(EDOM);
42
43 EXPECT_FP_EQ(aNaN, __llvm_libc::cosf(neg_inf));
44 EXPECT_MATH_ERRNO(EDOM);
45 }
46
TEST(LlvmLibcCosfTest,InFloatRange)47 TEST(LlvmLibcCosfTest, InFloatRange) {
48 constexpr uint32_t COUNT = 1000000;
49 constexpr uint32_t STEP = UINT32_MAX / COUNT;
50 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
51 float x = float(FPBits(v));
52 if (isnan(x) || isinf(x))
53 continue;
54 ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, __llvm_libc::cosf(x), 1.0);
55 }
56 }
57
58 // For small values, cos(x) is 1.
TEST(LlvmLibcCosfTest,SmallValues)59 TEST(LlvmLibcCosfTest, SmallValues) {
60 float x = float(FPBits(0x17800000U));
61 float result = __llvm_libc::cosf(x);
62 EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result, 1.0);
63 EXPECT_FP_EQ(1.0f, result);
64
65 x = float(FPBits(0x0040000U));
66 result = __llvm_libc::cosf(x);
67 EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result, 1.0);
68 EXPECT_FP_EQ(1.0f, result);
69 }
70
71 // SDCOMP-26094: check cosf in the cases for which the range reducer
72 // returns values furthest beyond its nominal upper bound of pi/4.
TEST(LlvmLibcCosfTest,SDCOMP_26094)73 TEST(LlvmLibcCosfTest, SDCOMP_26094) {
74 for (uint32_t v : SDCOMP26094_VALUES) {
75 float x = float(FPBits(v));
76 ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, __llvm_libc::cosf(x), 1.0);
77 }
78 }
79