1//===-- Unittests for exp2m1f ---------------------------------------------===//
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/CPP/array.h"
11#include "src/__support/FPUtil/FPBits.h"
12#include "src/__support/libc_errno.h"
13#include "src/math/exp2m1f.h"
14#include "test/UnitTest/FPMatcher.h"
15#include "test/UnitTest/Test.h"
16#include "utils/MPFRWrapper/MPFRUtils.h"
17
18#include <stdint.h>
19
20using LlvmLibcExp2m1fTest = LIBC_NAMESPACE::testing::FPTest<float>;
21
22namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
23
24TEST_F(LlvmLibcExp2m1fTest, TrickyInputs) {
25 constexpr LIBC_NAMESPACE::cpp::array<float, 10> INPUTS = {
26 // EXP2M1F_EXCEPTS_LO
27 0x1.36dc8ep-36,
28 0x1.224936p-19,
29 0x1.d16d2p-20,
30 0x1.17949ep-14,
31 -0x1.9c3e1ep-38,
32 -0x1.4d89b4p-32,
33 -0x1.a6eac4p-10,
34 -0x1.e7526ep-6,
35 // EXP2M1F_EXCEPTS_HI
36 0x1.16a972p-1,
37 -0x1.9f12acp-5,
38 };
39
40 for (float x : INPUTS) {
41 libc_errno = 0;
42 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2m1, x,
43 LIBC_NAMESPACE::exp2m1f(x), 0.5);
44 }
45}
46
47TEST_F(LlvmLibcExp2m1fTest, InFloatRange) {
48 constexpr uint32_t COUNT = 100'000;
49 constexpr uint32_t STEP = UINT32_MAX / COUNT;
50 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
51 float x = FPBits(v).get_val();
52 if (FPBits(v).is_nan() || FPBits(v).is_inf())
53 continue;
54 libc_errno = 0;
55 float result = LIBC_NAMESPACE::exp2m1f(x);
56
57 // If the computation resulted in an error or did not produce valid result
58 // in the single-precision floating point range, then ignore comparing with
59 // MPFR result as MPFR can still produce valid results because of its
60 // wider precision.
61 if (FPBits(result).is_nan() || FPBits(result).is_inf() || libc_errno != 0)
62 continue;
63 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2m1, x,
64 LIBC_NAMESPACE::exp2m1f(x), 0.5);
65 }
66}
67

source code of libc/test/src/math/exp2m1f_test.cpp