1//===-- Unittests for logf-----------------------------------------------===//
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/math/logf.h"
12#include "test/UnitTest/FPMatcher.h"
13#include "test/UnitTest/Test.h"
14#include "utils/MPFRWrapper/MPFRUtils.h"
15
16#include <stdint.h>
17
18using LlvmLibcLogfTest = LIBC_NAMESPACE::testing::FPTest<float>;
19
20namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
21
22TEST_F(LlvmLibcLogfTest, SpecialNumbers) {
23 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::logf(aNaN));
24 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::logf(inf));
25 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::logf(neg_inf), FE_INVALID);
26 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::logf(0.0f),
27 FE_DIVBYZERO);
28 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::logf(-0.0f),
29 FE_DIVBYZERO);
30 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::logf(-1.0f), FE_INVALID);
31 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::logf(1.0f));
32}
33
34TEST_F(LlvmLibcLogfTest, TrickyInputs) {
35 constexpr int N = 35;
36 constexpr uint32_t INPUTS[N] = {
37 0x1b7679ffU, /*0x1.ecf3fep-73f*/
38 0x1e88452dU, /*0x1.108a5ap-66f*/
39 0x3f800001U, /*0x1.000002p+0f*/
40 0x3509dcf6U, /*0x1.13b9ecp-21f*/
41 0x3bf86ef0U, /*0x1.f0ddep-8f*/
42 0x3c413d3aU, /*0x1.827a74p-7f*/
43 0x3ca1c99fU, /*0x1.43933ep-6f*/
44 0x3d13e105U, /*0x1.27c20ap-5f*/
45 0x3f7ff1f2U, /*0x1.ffe3e4p-1f*/
46 0x3f7fffffU, /*0x1.fffffep-1f*/
47 0x3f800001U, /*0x1.000002p+0f*/
48 0x3f800006U, /*0x1.00000cp+0f*/
49 0x3f800014U, /*0x1.000028p+0f*/
50 0x3f80001cU, /*0x1.000038p+0f*/
51 0x3f80c777U, /*0x1.018eeep+0f*/
52 0x3f80ce72U, /*0x1.019ce4p+0f*/
53 0x3f80d19fU, /*0x1.01a33ep+0f*/
54 0x3f80f7bfU, /*0x1.01ef7ep+0f*/
55 0x3f80fcfeU, /*0x1.01f9fcp+0f*/
56 0x3f81feb4U, /*0x1.03fd68p+0f*/
57 0x3f83d731U, /*0x1.07ae62p+0f*/
58 0x3f90cb1dU, /*0x1.21963ap+0f*/
59 0x3fc55379U, /*0x1.8aa6f2p+0f*/
60 0x3fd364d7U, /*0x1.a6c9aep+0f*/
61 0x41178febU, /*0x1.2f1fd6p+3f*/
62 0x4c5d65a5U, /*0x1.bacb4ap+25f*/
63 0x4e85f412U, /*0x1.0be824p+30f*/
64 0x500ffb03U, /*0x1.1ff606p+33f*/
65 0x5cd69e88U, /*0x1.ad3d1p+58f*/
66 0x5ee8984eU, /*0x1.d1309cp+62f*/
67 0x65d890d3U, /*0x1.b121a6p+76f*/
68 0x665e7ca6U, /*0x1.bcf94cp+77f*/
69 0x6f31a8ecU, /*0x1.6351d8p+95f*/
70 0x79e7ec37U, /*0x1.cfd86ep+116f*/
71 0x7a17f30aU, /*0x1.2fe614p+117f*/
72 };
73 for (int i = 0; i < N; ++i) {
74 float x = FPBits(INPUTS[i]).get_val();
75 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log, x,
76 LIBC_NAMESPACE::logf(x), 0.5);
77 }
78}
79
80TEST_F(LlvmLibcLogfTest, InFloatRange) {
81 constexpr uint32_t COUNT = 100'000;
82 constexpr uint32_t STEP = UINT32_MAX / COUNT;
83 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
84 float x = FPBits(v).get_val();
85 if (isnan(x: x) || isinf(x: x))
86 continue;
87 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log, x,
88 LIBC_NAMESPACE::logf(x), 0.5);
89 }
90}
91

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