1//===-- Unittests for tanhf -----------------------------------------------===//
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/errno/libc_errno.h"
12#include "src/math/tanhf.h"
13#include "test/UnitTest/FPMatcher.h"
14#include "test/UnitTest/Test.h"
15#include "utils/MPFRWrapper/MPFRUtils.h"
16
17#include <errno.h>
18#include <stdint.h>
19
20using LlvmLibcTanhfTest = LIBC_NAMESPACE::testing::FPTest<float>;
21
22namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
23
24TEST_F(LlvmLibcTanhfTest, SpecialNumbers) {
25 LIBC_NAMESPACE::libc_errno = 0;
26
27 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::tanhf(aNaN));
28 EXPECT_MATH_ERRNO(0);
29
30 EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::tanhf(0.0f));
31 EXPECT_MATH_ERRNO(0);
32
33 EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::tanhf(-0.0f));
34 EXPECT_MATH_ERRNO(0);
35
36 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::tanhf(inf));
37 EXPECT_MATH_ERRNO(0);
38
39 EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::tanhf(neg_inf));
40 EXPECT_MATH_ERRNO(0);
41}
42
43TEST_F(LlvmLibcTanhfTest, InFloatRange) {
44 constexpr uint32_t COUNT = 100'001;
45 constexpr uint32_t STEP = UINT32_MAX / COUNT;
46 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
47 float x = FPBits(v).get_val();
48 if (isnan(x: x) || isinf(x: x))
49 continue;
50 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
51 LIBC_NAMESPACE::tanhf(x), 0.5);
52 }
53}
54
55TEST_F(LlvmLibcTanhfTest, ExceptionalValues) {
56 constexpr int N = 4;
57 constexpr uint32_t INPUTS[N] = {
58 0x0040'0000,
59 0x1780'0000,
60 0x3a12'85ff,
61 0x4058'e0a3,
62 };
63
64 for (int i = 0; i < N; ++i) {
65 float x = FPBits(INPUTS[i]).get_val();
66 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
67 LIBC_NAMESPACE::tanhf(x), 0.5);
68 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, -x,
69 LIBC_NAMESPACE::tanhf(-x), 0.5);
70 }
71}
72

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