1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*=============================================================================
**
** Source: test1.c
**
** Purpose: Test to ensure that tanhf return the correct values
**
** Dependencies: PAL_Initialize
** PAL_Terminate
** Fail
** fabs
**
**===========================================================================*/
#include <palsuite.h>
// binary32 (float) has a machine epsilon of 2^-23 (approx. 1.19e-07). However, this
// is slightly too accurate when writing tests meant to run against libm implementations
// for various platforms. 2^-21 (approx. 4.76e-07) seems to be as accurate as we can get.
//
// The tests themselves will take PAL_EPSILON and adjust it according to the expected result
// so that the delta used for comparison will compare the most significant digits and ignore
// any digits that are outside the double precision range (6-9 digits).
// For example, a test with an expect result in the format of 0.xxxxxxxxx will use PAL_EPSILON
// for the variance, while an expected result in the format of 0.0xxxxxxxxx will use
// PAL_EPSILON / 10 and and expected result in the format of x.xxxxxx will use PAL_EPSILON * 10.
#define PAL_EPSILON 4.76837158e-07
#define PAL_NAN sqrtf(-1.0f)
#define PAL_POSINF -logf(0.0f)
#define PAL_NEGINF logf(0.0f)
/**
* Helper test structure
*/
struct test
{
float value; /* value to test the function with */
float expected; /* expected result */
float variance; /* maximum delta between the expected and actual result */
};
/**
* validate
*
* test validation function
*/
void __cdecl validate(float value, float expected, float variance)
{
float result = tanhf(value);
/*
* The test is valid when the difference between result
* and expected is less than or equal to variance
*/
float delta = fabsf(result - expected);
if (delta > variance)
{
Fail("tanhf(%g) returned %10.9g when it should have returned %10.9g",
value, result, expected);
}
}
/**
* validate
*
* test validation function for values returning NaN
*/
void __cdecl validate_isnan(float value)
{
float result = tanhf(value);
if (!_isnanf(result))
{
Fail("tanhf(%g) returned %10.9g when it should have returned %10.9g",
value, result, PAL_NAN);
}
}
/**
* main
*
* executable entry point
*/
int __cdecl main(int argc, char **argv)
{
struct test tests[] =
{
/* value expected variance */
{ 0, 0, PAL_EPSILON },
{ 0.318309886f, 0.307977913f, PAL_EPSILON }, // value: 1 / pi
{ 0.434294482f, 0.408904012f, PAL_EPSILON }, // value: log10f(e)
{ 0.636619772f, 0.562593600f, PAL_EPSILON }, // value: 2 / pi
{ 0.693147181f, 0.6f, PAL_EPSILON }, // value: ln(2)
{ 0.707106781f, 0.608859365f, PAL_EPSILON }, // value: 1 / sqrtf(2)
{ 0.785398163f, 0.655794203f, PAL_EPSILON }, // value: pi / 4
{ 1, 0.761594156f, PAL_EPSILON },
{ 1.12837917f, 0.810463806f, PAL_EPSILON }, // value: 2 / sqrtf(pi)
{ 1.41421356f, 0.888385562f, PAL_EPSILON }, // value: sqrtf(2)
{ 1.44269504f, 0.894238946f, PAL_EPSILON }, // value: logf2(e)
{ 1.57079633f, 0.917152336f, PAL_EPSILON }, // value: pi / 2
{ 2.30258509f, 0.980198020f, PAL_EPSILON }, // value: ln(10)
{ 2.71828183f, 0.991328916f, PAL_EPSILON }, // value: e
{ 3.14159265f, 0.996272076f, PAL_EPSILON }, // value: pi
{ PAL_POSINF, 1, PAL_EPSILON * 10 }
};
/* PAL initialization */
if (PAL_Initialize(argc, argv) != 0)
{
return FAIL;
}
for (int i = 0; i < (sizeof(tests) / sizeof(struct test)); i++)
{
validate( tests[i].value, tests[i].expected, tests[i].variance);
validate(-tests[i].value, -tests[i].expected, tests[i].variance);
}
validate_isnan(PAL_NAN);
PAL_Terminate();
return PASS;
}
|
