1 //===-- Unittests for log1pf ----------------------------------------------===//
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/__support/FPUtil/FPBits.h"
10 #include "src/math/log1pf.h"
11 #include "utils/MPFRWrapper/MPFRUtils.h"
12 #include "utils/UnitTest/FPMatcher.h"
13 #include "utils/UnitTest/Test.h"
14 #include <math.h>
15 
16 #include <errno.h>
17 #include <stdint.h>
18 
19 namespace mpfr = __llvm_libc::testing::mpfr;
20 
21 DECLARE_SPECIAL_CONSTANTS(float)
22 
23 TEST(LlvmLibclog1pfTest, SpecialNumbers) {
24   EXPECT_FP_EQ(aNaN, __llvm_libc::log1pf(aNaN));
25   EXPECT_FP_EQ(inf, __llvm_libc::log1pf(inf));
26   EXPECT_TRUE(FPBits((__llvm_libc::log1pf(neg_inf))).is_nan());
27   EXPECT_FP_EQ(zero, __llvm_libc::log1pf(0.0f));
28   EXPECT_FP_EQ(neg_zero, __llvm_libc::log1pf(-0.0f));
29   EXPECT_FP_EQ(neg_inf, __llvm_libc::log1pf(-1.0f));
30 }
31 
32 TEST(LlvmLibclog1pfTest, TrickyInputs) {
33   constexpr int N = 20;
34   constexpr uint32_t INPUTS[N] = {
35       0x35c00006U, /*0x1.80000cp-20f*/
36       0x35400003U, /*0x1.800006p-21f*/
37       0x3640000cU, /*0x1.800018p-19f*/
38       0x36c00018U, /*0x1.80003p-18f*/
39       0x3710001bU, /*0x1.200036p-17f*/
40       0x37400030U, /*0x1.80006p-17f*/
41       0x3770004bU, /*0x1.e00096p-17f*/
42       0x3b9315c8U, /*0x1.262b9p-8f*/
43       0x3c6eb7afU, /*0x1.dd6f5ep-7f*/
44       0x41078febU, /*0x1.0f1fd6p+3f*/
45       0x5cd69e88U, /*0x1.ad3d1p+58f*/
46       0x65d890d3U, /*0x1.b121a6p+76f*/
47       0x6f31a8ecU, /*0x1.6351d8p+95f*/
48       0x7a17f30aU, /*0x1.2fe614p+117f*/
49       0xb53ffffdU, /*-0x1.7ffffap-21f*/
50       0xb70fffe5U, /*-0x1.1fffcap-17f*/
51       0xbb0ec8c4U, /*-0x1.1d9188p-9f*/
52       0xbc4d092cU, /*-0x1.9a1258p-7f*/
53       0xbc657728U, /*-0x1.caee5p-7f*/
54       0xbd1d20afU, /*-0x1.3a415ep-5f*/
55   };
56   for (int i = 0; i < N; ++i) {
57     float x = float(FPBits(INPUTS[i]));
58     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log1p, x,
59                                    __llvm_libc::log1pf(x), 0.5);
60   }
61 }
62 
63 TEST(LlvmLibclog1pfTest, InFloatRange) {
64   constexpr uint32_t COUNT = 1000000;
65   constexpr uint32_t STEP = UINT32_MAX / COUNT;
66   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
67     float x = float(FPBits(v));
68     if (isnan(x) || isinf(x))
69       continue;
70     errno = 0;
71     float result = __llvm_libc::log1pf(x);
72     // If the computation resulted in an error or did not produce valid result
73     // in the single-precision floating point range, then ignore comparing with
74     // MPFR result as MPFR can still produce valid results because of its
75     // wider precision.
76     if (isnan(result) || isinf(result) || errno != 0)
77       continue;
78     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log1p, x,
79                                    __llvm_libc::log1pf(x), 0.5);
80   }
81 }
82