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/errno/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 <errno.h>
18 #include <stdint.h>
19
20 using LlvmLibcAtanfTest = LIBC_NAMESPACE::testing::FPTest<float>;
21
22 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
23
24 // TODO: This test needs to have its checks for exceptions, errno
25 // tightened
TEST_F(LlvmLibcAtanfTest,SpecialNumbers)26 TEST_F(LlvmLibcAtanfTest, SpecialNumbers) {
27 LIBC_NAMESPACE::libc_errno = 0;
28 LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
29 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanf(aNaN));
30 // TODO: Uncomment these checks later, RoundingMode affects running
31 // tests in this way https://github.com/llvm/llvm-project/issues/90653.
32 // EXPECT_FP_EXCEPTION(0);
33 EXPECT_MATH_ERRNO(0);
34
35 LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
36 EXPECT_FP_EQ_ALL_ROUNDING(0.0f, LIBC_NAMESPACE::atanf(0.0f));
37 // TODO: Uncomment these checks later, RoundingMode affects running
38 // tests in this way https://github.com/llvm/llvm-project/issues/90653.
39 // EXPECT_FP_EXCEPTION(0);
40 EXPECT_MATH_ERRNO(0);
41
42 LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
43 EXPECT_FP_EQ_ALL_ROUNDING(-0.0f, LIBC_NAMESPACE::atanf(-0.0f));
44 // TODO: Uncomment these checks later, RoundingMode affects running
45 // tests in this way https://github.com/llvm/llvm-project/issues/90653.
46 // EXPECT_FP_EXCEPTION(0);
47 EXPECT_MATH_ERRNO(0);
48 }
49
TEST_F(LlvmLibcAtanfTest,InFloatRange)50 TEST_F(LlvmLibcAtanfTest, InFloatRange) {
51 constexpr uint32_t COUNT = 100'000;
52 const uint32_t STEP = FPBits(inf).uintval() / COUNT;
53 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
54 float x = FPBits(v).get_val();
55 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, x,
56 LIBC_NAMESPACE::atanf(x), 0.5);
57 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, -x,
58 LIBC_NAMESPACE::atanf(-x), 0.5);
59 }
60 }
61
62 // For small values, tanh(x) is x.
TEST_F(LlvmLibcAtanfTest,SpecialValues)63 TEST_F(LlvmLibcAtanfTest, SpecialValues) {
64 uint32_t val_arr[] = {
65 0x3d8d6b23U, // x = 0x1.1ad646p-4f
66 0x3dbb6ac7U, // x = 0x1.76d58ep-4f
67 0x3feefcfbU, // x = 0x1.ddf9f6p+0f
68 0x3ffe2ec1U, // x = 0x1.fc5d82p+0f
69 0xbd8d6b23U, // x = -0x1.1ad646p-4f
70 0xbdbb6ac7U, // x = -0x1.76d58ep-4f
71 0xbfeefcfbU, // x = -0x1.ddf9f6p+0f
72 0xbffe2ec1U, // x = -0x1.fc5d82p+0
73 0x7F800000U, // x = +Inf
74 0xFF800000U, // x = -Inf
75 };
76 for (uint32_t v : val_arr) {
77 float x = FPBits(v).get_val();
78 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, x,
79 LIBC_NAMESPACE::atanf(x), 0.5);
80 }
81 }
82