1// Licensed to the .NET Foundation under one or more agreements.
2// The .NET Foundation licenses this file to you under the MIT license.
3// See the LICENSE file in the project root for more information.
4
5/*============================================================================
6**
7** Source: test1.c
8**
9** Purpose: Tests ceilf with simple positive and negative values. Also tests
10** extreme cases like extremely small values and positive and
11** negative infinity. Makes sure that calling ceilf on NaN returns
12** NaN
13**
14**==========================================================================*/
15
16#include <palsuite.h>
17
18// binary32 (float) has a machine epsilon of 2^-23 (approx. 1.19e-07). However, this
19// is slightly too accurate when writing tests meant to run against libm implementations
20// for various platforms. 2^-21 (approx. 4.76e-07) seems to be as accurate as we can get.
21//
22// The tests themselves will take PAL_EPSILON and adjust it according to the expected result
23// so that the delta used for comparison will compare the most significant digits and ignore
24// any digits that are outside the double precision range (6-9 digits).
25
26// For example, a test with an expect result in the format of 0.xxxxxxxxx will use PAL_EPSILON
27// for the variance, while an expected result in the format of 0.0xxxxxxxxx will use
28// PAL_EPSILON / 10 and and expected result in the format of x.xxxxxx will use PAL_EPSILON * 10.
29#define PAL_EPSILON 4.76837158e-07
30
31#define PAL_NAN sqrtf(-1.0f)
32#define PAL_POSINF -logf(0.0f)
33#define PAL_NEGINF logf(0.0f)
34
35/**
36 * Helper test structure
37 */
38struct test
39{
40 float value; /* value to test the function with */
41 float expected; /* expected result */
42 float variance; /* maximum delta between the expected and actual result */
43};
44
45/**
46 * validate
47 *
48 * test validation function
49 */
50void __cdecl validate(float value, float expected, float variance)
51{
52 float result = ceilf(value);
53
54 /*
55 * The test is valid when the difference between result
56 * and expected is less than or equal to variance
57 */
58 float delta = fabsf(result - expected);
59
60 if (delta > variance)
61 {
62 Fail("ceilf(%g) returned %10.9g when it should have returned %10.9g",
63 value, result, expected);
64 }
65}
66
67/**
68 * validate
69 *
70 * test validation function for values returning NaN
71 */
72void __cdecl validate_isnan(float value)
73{
74 float result = ceilf(value);
75
76 if (!_isnanf(result))
77 {
78 Fail("ceilf(%g) returned %10.9g when it should have returned %10.9g",
79 value, result, PAL_NAN);
80 }
81}
82
83/**
84 * main
85 *
86 * executable entry point
87 */
88int __cdecl main(int argc, char *argv[])
89{
90 struct test tests[] =
91 {
92 /* value expected variance */
93 { 0.318309886f, 1, PAL_EPSILON * 10 }, // value: 1 / pi
94 { 0.434294482f, 1, PAL_EPSILON * 10 }, // value: log10f(e)
95 { 0.636619772f, 1, PAL_EPSILON * 10 }, // value: 2 / pi
96 { 0.693147181f, 1, PAL_EPSILON * 10 }, // value: ln(2)
97 { 0.707106781f, 1, PAL_EPSILON * 10 }, // value: 1 / sqrtf(2)
98 { 0.785398163f, 1, PAL_EPSILON * 10 }, // value: pi / 4
99 { 1.12837917f, 2, PAL_EPSILON * 10 }, // value: 2 / sqrtf(pi)
100 { 1.41421356f, 2, PAL_EPSILON * 10 }, // value: sqrtf(2)
101 { 1.44269504f, 2, PAL_EPSILON * 10 }, // value: logf2(e)
102 { 1.57079633f, 2, PAL_EPSILON * 10 }, // value: pi / 2
103 { 2.30258509f, 3, PAL_EPSILON * 10 }, // value: ln(10)
104 { 2.71828183f, 3, PAL_EPSILON * 10 }, // value: e
105 { 3.14159265f, 4, PAL_EPSILON * 10 }, // value: pi
106 { PAL_POSINF, PAL_POSINF, 0 }
107 };
108
109 /* PAL initialization */
110 if (PAL_Initialize(argc, argv) != 0)
111 {
112 return FAIL;
113 }
114
115 validate( 0, 0, PAL_EPSILON);
116 validate(-0.0f, 0, PAL_EPSILON);
117
118 validate( 1, 1, PAL_EPSILON * 10);
119 validate(-1.0f, -1, PAL_EPSILON * 10);
120
121 for (int i = 0; i < (sizeof(tests) / sizeof(struct test)); i++)
122 {
123 validate( tests[i].value, tests[i].expected, tests[i].variance);
124 validate(-tests[i].value, 1 - tests[i].expected, tests[i].variance);
125 }
126
127 validate_isnan(PAL_NAN);
128
129 PAL_Terminate();
130 return PASS;
131}
132