1//===-- Unittests for atan2f128 -------------------------------------------===//
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/math/atan2f128.h"
10#include "test/UnitTest/FPMatcher.h"
11#include "test/UnitTest/Test.h"
12#include "utils/MPFRWrapper/MPFRUtils.h"
13
14using LlvmLibcAtan2f128Test = LIBC_NAMESPACE::testing::FPTest<float128>;
15using LIBC_NAMESPACE::testing::tlog;
16
17namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
18
19TEST_F(LlvmLibcAtan2f128Test, InQuadRange) {
20 constexpr StorageType X_COUNT = 123;
21 constexpr StorageType X_START =
22 FPBits(static_cast<float128>(0.25q)).uintval();
23 constexpr StorageType X_STOP = FPBits(static_cast<float128>(4.0q)).uintval();
24 constexpr StorageType X_STEP = (X_STOP - X_START) / X_COUNT;
25
26 constexpr StorageType Y_COUNT = 137;
27 constexpr StorageType Y_START =
28 FPBits(static_cast<float128>(0.25q)).uintval();
29 constexpr StorageType Y_STOP = FPBits(static_cast<float128>(4.0q)).uintval();
30 constexpr StorageType Y_STEP = (Y_STOP - Y_START) / Y_COUNT;
31
32 auto test = [&](mpfr::RoundingMode rounding_mode) {
33 mpfr::ForceRoundingMode __r(rounding_mode);
34 if (!__r.success)
35 return;
36
37 uint64_t fails = 0;
38 uint64_t finite_count = 0;
39 uint64_t total_count = 0;
40 float128 failed_x = 0.0, failed_y = 0.0, failed_r = 0.0;
41 double tol = 0.5;
42
43 for (StorageType i = 0, v = X_START; i <= X_COUNT; ++i, v += X_STEP) {
44 float128 x = FPBits(v).get_val();
45 if (FPBits(x).is_inf_or_nan() || x < 0.0q)
46 continue;
47
48 for (StorageType j = 0, w = Y_START; j <= Y_COUNT; ++j, w += Y_STEP) {
49 float128 y = FPBits(w).get_val();
50 if (FPBits(y).is_inf_or_nan())
51 continue;
52
53 float128 result = LIBC_NAMESPACE::atan2f128(x, y);
54 ++total_count;
55 if (FPBits(result).is_inf_or_nan())
56 continue;
57
58 ++finite_count;
59 mpfr::BinaryInput<float128> inputs{x, y};
60
61 if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Atan2, inputs,
62 result, 2.0, rounding_mode)) {
63 ++fails;
64 while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(
65 mpfr::Operation::Atan2, inputs, result, tol, rounding_mode)) {
66 failed_x = x;
67 failed_y = y;
68 failed_r = result;
69
70 if (tol > 1000.0)
71 break;
72
73 tol *= 2.0;
74 }
75 }
76 }
77 }
78 if (fails || (finite_count < total_count)) {
79 tlog << " Atan2 failed: " << fails << "/" << finite_count << "/"
80 << total_count << " tests.\n"
81 << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
82 }
83 if (fails) {
84 mpfr::BinaryInput<float128> inputs{failed_x, failed_y};
85 EXPECT_MPFR_MATCH(mpfr::Operation::Atan2, inputs, failed_r, 0.5,
86 rounding_mode);
87 }
88 };
89
90 tlog << " Test Rounding To Nearest...\n";
91 test(mpfr::RoundingMode::Nearest);
92
93 tlog << " Test Rounding Downward...\n";
94 test(mpfr::RoundingMode::Downward);
95
96 tlog << " Test Rounding Upward...\n";
97 test(mpfr::RoundingMode::Upward);
98
99 tlog << " Test Rounding Toward Zero...\n";
100 test(mpfr::RoundingMode::TowardZero);
101}
102

source code of libc/test/src/math/atan2f128_test.cpp