1//===-- Unittests for acosf -----------------------------------------------===//
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/acosf.h"
13#include "test/UnitTest/FPMatcher.h"
14#include "test/UnitTest/Test.h"
15#include "utils/MPFRWrapper/MPFRUtils.h"
16
17#include <errno.h>
18#include <stdint.h>
19
20namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
21
22using LlvmLibcAcosfTest = LIBC_NAMESPACE::testing::FPTest<float>;
23
24TEST_F(LlvmLibcAcosfTest, SpecialNumbers) {
25 LIBC_NAMESPACE::libc_errno = 0;
26
27 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acosf(aNaN));
28 EXPECT_MATH_ERRNO(0);
29
30 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acosf(inf));
31 EXPECT_MATH_ERRNO(EDOM);
32
33 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acosf(neg_inf));
34 EXPECT_MATH_ERRNO(EDOM);
35
36 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::acosf(1.0f));
37 EXPECT_MATH_ERRNO(0);
38
39 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acosf(2.0f));
40 EXPECT_MATH_ERRNO(EDOM);
41
42 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acosf(-2.0f));
43 EXPECT_MATH_ERRNO(EDOM);
44}
45
46TEST_F(LlvmLibcAcosfTest, InFloatRange) {
47 constexpr uint32_t COUNT = 100'000;
48 constexpr uint32_t STEP = UINT32_MAX / COUNT;
49 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
50 float x = FPBits(v).get_val();
51 if (isnan(x: x) || isinf(x: x))
52 continue;
53 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Acos, x,
54 LIBC_NAMESPACE::acosf(x), 0.5);
55 }
56}
57
58TEST_F(LlvmLibcAcosfTest, SpecificBitPatterns) {
59 constexpr int N = 13;
60 constexpr uint32_t INPUTS[N] = {
61 0x3f000000, // x = 0.5f
62 0x3f3504f3, // x = sqrt(2)/2, FE_DOWNWARD
63 0x3f3504f4, // x = sqrt(2)/2, FE_UPWARD
64 0x3f5db3d7, // x = sqrt(3)/2, FE_DOWNWARD
65 0x3f5db3d8, // x = sqrt(3)/2, FE_UPWARD
66 0x3f800000, // x = 1.0f
67 0x40000000, // x = 2.0f
68 0x328885a3, // x = 0x1.110b46p-26
69 0x39826222, // x = 0x1.04c444p-12
70 0x3d09bf86, // x = 0x1.137f0cp-5f
71 0x3de5fa1e, // x = 0x1.cbf43cp-4f
72 0x3f083a1a, // x = 0x1.107434p-1f
73 0x3f7741b6, // x = 0x1.ee836cp-1f
74 };
75
76 for (int i = 0; i < N; ++i) {
77 float x = FPBits(INPUTS[i]).get_val();
78 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Acos, x,
79 LIBC_NAMESPACE::acosf(x), 0.5);
80 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Acos, -x,
81 LIBC_NAMESPACE::acosf(-x), 0.5);
82 }
83}
84

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