1//===-- Unittests for tan -------------------------------------------------===//
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/__support/FPUtil/FPBits.h"
10#include "src/math/tan.h"
11#include "test/UnitTest/FPMatcher.h"
12#include "test/UnitTest/Test.h"
13#include "utils/MPFRWrapper/MPFRUtils.h"
14
15using LlvmLibcTanTest = LIBC_NAMESPACE::testing::FPTest<double>;
16
17namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
18
19using LIBC_NAMESPACE::testing::tlog;
20
21TEST_F(LlvmLibcTanTest, TrickyInputs) {
22 constexpr double INPUTS[] = {
23 0x0.0000000000001p-1022, 0x1.d130383d17321p-27, 0x1.8000000000009p-23,
24 0x1.8000000000024p-22, 0x1.800000000009p-21, 0x1.20000000000f3p-20,
25 0x1.800000000024p-20, 0x1.e0000000001c2p-20, 0x1.00452f0e0134dp-13,
26 0x1.0da8cc189b47dp-10, 0x1.00a33764a0a83p-7, 0x1.911a18779813fp-7,
27 0x1.940c877fb7dacp-7, 0x1.f42fb19b5b9b2p-6, 0x1.0285070f9f1bcp-5,
28 0x1.90e833c6969c7p-4, 0x1.91d4b77c527eap-3, 0x1.89f0f5241255bp-2,
29 0x1.6ca9ef729af76p-1, 0x1.23f40dccdef72p+0, 0x1.43cf16358c9d7p+0,
30 0x1.90f422b49115ep+0, 0x1.9220efee9fc7ep+0, 0x1.a224411cdebcep+0,
31 0x1.addf3b9722265p+0, 0x1.ae78d360afa15p+0, 0x1.fe81868fc47fep+1,
32 0x1.e31b55306f22cp+2, 0x1.e639103a05997p+2, 0x1.f69d074a3358fp+2,
33 0x1.f7898d5a756ddp+2, 0x1.1685973506319p+3, 0x1.5f09cad750ab1p+3,
34 0x1.aaf85537ea4c7p+3, 0x1.c50ddc4f513b4p+3, 0x1.13114266f9764p+4,
35 0x1.4f2b874135d27p+4, 0x1.a211877de55dbp+4, 0x1.a5eece87e8606p+4,
36 0x1.a65d441ea6dcep+4, 0x1.ab8c2f8ab5b7p+4, 0x1.045457ae3994p+5,
37 0x1.1ffb509f3db15p+5, 0x1.2345d1e090529p+5, 0x1.c96e28eb679f8p+5,
38 0x1.da1838053b866p+5, 0x1.be886d9c2324dp+6, 0x1.ab514bfc61c76p+7,
39 0x1.14823229799c2p+7, 0x1.48ff1782ca91dp+8, 0x1.dcbfda0c7559ep+8,
40 0x1.dcbfda0c7559ep+8, 0x1.2e566149bf5fdp+9, 0x1.cb996c60f437ep+9,
41 0x1.119471e9216cdp+10, 0x1.ae945054939c2p+10, 0x1.fffffffffdb6p+24,
42 0x1.fd4da4ef37075p+29, 0x1.55202aefde314p+31, 0x1.b951f1572eba5p+31,
43 0x1.76e86a7485a46p59, 0x1.7776c2343ba4ep+101, 0x1.85fc0f04c0128p+101,
44 0x1.678309fa50d58p+110, 0x1.524489232dc4ap+178, 0x1.fffffffffef4ep+199,
45 0x1.6deb37da81129p+205, 0x1.3eec5912ea7cdp+331, 0x1.08087e9aad90bp+887,
46 0x1.6ac5b262ca1ffp+843, 0x1.8bb5847d49973p+845, 0x1.6ac5b262ca1ffp+849,
47 0x1.f08b14e1c4d0fp+890, 0x1.2b5fe88a9d8d5p+903, 0x1.a880417b7b119p+1023,
48 0x1.f6d7518808571p+1023,
49
50 };
51 constexpr int N = sizeof(INPUTS) / sizeof(INPUTS[0]);
52
53 for (int i = 0; i < N; ++i) {
54 double x = INPUTS[i];
55 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tan, x,
56 LIBC_NAMESPACE::tan(x), 0.5);
57 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tan, -x,
58 LIBC_NAMESPACE::tan(-x), 0.5);
59 }
60}
61
62TEST_F(LlvmLibcTanTest, InDoubleRange) {
63 constexpr uint64_t COUNT = 1'234'51;
64 uint64_t START = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p-50).uintval();
65 uint64_t STOP = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p200).uintval();
66 uint64_t STEP = (STOP - START) / COUNT;
67
68 auto test = [&](mpfr::RoundingMode rounding_mode) {
69 mpfr::ForceRoundingMode force_rounding(rounding_mode);
70 if (!force_rounding.success)
71 return;
72
73 uint64_t fails = 0;
74 uint64_t tested = 0;
75 uint64_t total = 0;
76 double worst_input, worst_output = 0.0;
77 double ulp = 0.5;
78
79 for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
80 double x = FPBits(v).get_val();
81 if (FPBits(v).is_nan() || FPBits(v).is_inf())
82 continue;
83
84 double result = LIBC_NAMESPACE::tan(x);
85 ++total;
86 if (FPBits(result).is_nan() || FPBits(result).is_inf())
87 continue;
88
89 ++tested;
90
91 if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Tan, x, result,
92 0.5, rounding_mode)) {
93 ++fails;
94 while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Tan, x,
95 result, ulp, rounding_mode)) {
96 worst_input = x;
97 worst_output = result;
98
99 if (ulp > 1000.0)
100 break;
101
102 ulp *= 2.0;
103 }
104 }
105 }
106 if (fails) {
107 tlog << " Tan failed: " << fails << "/" << tested << "/" << total
108 << " tests.\n";
109 tlog << " Max ULPs is at most: " << static_cast<uint64_t>(ulp) << ".\n";
110 EXPECT_MPFR_MATCH(mpfr::Operation::Tan, worst_input, worst_output, 0.5,
111 rounding_mode);
112 }
113 };
114
115 tlog << " Test Rounding To Nearest...\n";
116 test(mpfr::RoundingMode::Nearest);
117
118 tlog << " Test Rounding Downward...\n";
119 test(mpfr::RoundingMode::Downward);
120
121 tlog << " Test Rounding Upward...\n";
122 test(mpfr::RoundingMode::Upward);
123
124 tlog << " Test Rounding Toward Zero...\n";
125 test(mpfr::RoundingMode::TowardZero);
126}
127

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