1//===-- Unittests for atanf -----------------------------------------------===//
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/atanf.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
19using LlvmLibcAtanfTest = LIBC_NAMESPACE::testing::FPTest<float>;
20
21namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
22
23// TODO: This test needs to have its checks for exceptions, errno
24// tightened
25TEST_F(LlvmLibcAtanfTest, SpecialNumbers) {
26 libc_errno = 0;
27 LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
28 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanf(aNaN));
29 // TODO: Uncomment these checks later, RoundingMode affects running
30 // tests in this way https://github.com/llvm/llvm-project/issues/90653.
31 // EXPECT_FP_EXCEPTION(0);
32 EXPECT_MATH_ERRNO(0);
33
34 LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
35 EXPECT_FP_EQ_ALL_ROUNDING(0.0f, LIBC_NAMESPACE::atanf(0.0f));
36 // TODO: Uncomment these checks later, RoundingMode affects running
37 // tests in this way https://github.com/llvm/llvm-project/issues/90653.
38 // EXPECT_FP_EXCEPTION(0);
39 EXPECT_MATH_ERRNO(0);
40
41 LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
42 EXPECT_FP_EQ_ALL_ROUNDING(-0.0f, LIBC_NAMESPACE::atanf(-0.0f));
43 // TODO: Uncomment these checks later, RoundingMode affects running
44 // tests in this way https://github.com/llvm/llvm-project/issues/90653.
45 // EXPECT_FP_EXCEPTION(0);
46 EXPECT_MATH_ERRNO(0);
47}
48
49TEST_F(LlvmLibcAtanfTest, InFloatRange) {
50 constexpr uint32_t COUNT = 100'000;
51 const uint32_t STEP = FPBits(inf).uintval() / COUNT;
52 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
53 float x = FPBits(v).get_val();
54 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, x,
55 LIBC_NAMESPACE::atanf(x), 0.5);
56 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, -x,
57 LIBC_NAMESPACE::atanf(-x), 0.5);
58 }
59}
60
61// For small values, tanh(x) is x.
62TEST_F(LlvmLibcAtanfTest, SpecialValues) {
63 uint32_t val_arr[] = {
64 0x3d8d6b23U, // x = 0x1.1ad646p-4f
65 0x3dbb6ac7U, // x = 0x1.76d58ep-4f
66 0x3feefcfbU, // x = 0x1.ddf9f6p+0f
67 0x3ffe2ec1U, // x = 0x1.fc5d82p+0f
68 0xbd8d6b23U, // x = -0x1.1ad646p-4f
69 0xbdbb6ac7U, // x = -0x1.76d58ep-4f
70 0xbfeefcfbU, // x = -0x1.ddf9f6p+0f
71 0xbffe2ec1U, // x = -0x1.fc5d82p+0
72 0x7F800000U, // x = +Inf
73 0xFF800000U, // x = -Inf
74 };
75 for (uint32_t v : val_arr) {
76 float x = FPBits(v).get_val();
77 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, x,
78 LIBC_NAMESPACE::atanf(x), 0.5);
79 }
80}
81

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