1//===-- Unittests for asin ------------------------------------------------===//
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/asin.h"
10#include "test/UnitTest/FPMatcher.h"
11#include "test/UnitTest/Test.h"
12#include "utils/MPFRWrapper/MPFRUtils.h"
13
14using LlvmLibcAsinTest = LIBC_NAMESPACE::testing::FPTest<double>;
15
16namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
17
18using LIBC_NAMESPACE::testing::tlog;
19
20TEST_F(LlvmLibcAsinTest, InDoubleRange) {
21 constexpr uint64_t COUNT = 123'451;
22 uint64_t START = FPBits(0x1.0p-60).uintval();
23 uint64_t STOP = FPBits(1.0).uintval();
24 uint64_t STEP = (STOP - START) / COUNT;
25
26 auto test = [&](mpfr::RoundingMode rounding_mode) {
27 mpfr::ForceRoundingMode __r(rounding_mode);
28 if (!__r.success)
29 return;
30
31 uint64_t fails = 0;
32 uint64_t count = 0;
33 uint64_t cc = 0;
34 double mx = 0.0, mr = 0.0;
35 double tol = 0.5;
36
37 for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
38 double x = FPBits(v).get_val();
39 if (FPBits(v).is_nan() || FPBits(v).is_inf())
40 continue;
41 libc_errno = 0;
42 double result = LIBC_NAMESPACE::asin(x);
43 ++cc;
44 if (FPBits(result).is_nan() || FPBits(result).is_inf())
45 continue;
46
47 ++count;
48
49 if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Asin, x, result,
50 0.5, rounding_mode)) {
51 ++fails;
52 while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Asin, x,
53 result, tol, rounding_mode)) {
54 mx = x;
55 mr = result;
56
57 if (tol > 1000.0)
58 break;
59
60 tol *= 2.0;
61 }
62 }
63 }
64 if (fails) {
65 tlog << " Asin failed: " << fails << "/" << count << "/" << cc
66 << " tests.\n";
67 tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
68 EXPECT_MPFR_MATCH(mpfr::Operation::Asin, mx, mr, 0.5, rounding_mode);
69 }
70 };
71
72 tlog << " Test Rounding To Nearest...\n";
73 test(mpfr::RoundingMode::Nearest);
74
75 tlog << " Test Rounding Downward...\n";
76 test(mpfr::RoundingMode::Downward);
77
78 tlog << " Test Rounding Upward...\n";
79 test(mpfr::RoundingMode::Upward);
80
81 tlog << " Test Rounding Toward Zero...\n";
82 test(mpfr::RoundingMode::TowardZero);
83}
84

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