1//===-- Unittests for acos ------------------------------------------------===//
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/acos.h"
10#include "test/UnitTest/FPMatcher.h"
11#include "test/UnitTest/Test.h"
12#include "utils/MPFRWrapper/MPFRUtils.h"
13
14using LlvmLibcAcosTest = LIBC_NAMESPACE::testing::FPTest<double>;
15
16namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
17
18using LIBC_NAMESPACE::testing::tlog;
19
20TEST_F(LlvmLibcAcosTest, 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_inf_or_nan())
40 continue;
41 double result = LIBC_NAMESPACE::acos(x);
42 ++cc;
43 if (FPBits(result).is_inf_or_nan())
44 continue;
45
46 ++count;
47
48 if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Acos, x, result,
49 0.5, rounding_mode)) {
50 ++fails;
51 while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Acos, x,
52 result, tol, rounding_mode)) {
53 mx = x;
54 mr = result;
55
56 if (tol > 1000.0)
57 break;
58
59 tol *= 2.0;
60 }
61 }
62 }
63 if (fails) {
64 tlog << " Acos failed: " << fails << "/" << count << "/" << cc
65 << " tests.\n";
66 tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
67 EXPECT_MPFR_MATCH(mpfr::Operation::Acos, mx, mr, 0.5, rounding_mode);
68 }
69 };
70
71 tlog << " Test Rounding To Nearest...\n";
72 test(mpfr::RoundingMode::Nearest);
73
74 tlog << " Test Rounding Downward...\n";
75 test(mpfr::RoundingMode::Downward);
76
77 tlog << " Test Rounding Upward...\n";
78 test(mpfr::RoundingMode::Upward);
79
80 tlog << " Test Rounding Toward Zero...\n";
81 test(mpfr::RoundingMode::TowardZero);
82}
83

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