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

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