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 that ilogbf returns correct values.
10**
11**===================================================================*/
12
13#include <palsuite.h>
14
15#define PAL_NAN sqrtf(-1.0f)
16#define PAL_POSINF -logf(0.0f)
17#define PAL_NEGINF logf(0.0f)
18
19/**
20 * Helper test structure
21 */
22struct test
23{
24 float value; /* value to test the function with */
25 int expected; /* expected result */
26};
27
28/**
29 * validate
30 *
31 * test validation function
32 */
33void __cdecl validate(float value, int expected)
34{
35 int result = ilogbf(value);
36
37 if (result != expected)
38 {
39 Fail("ilogbf(%g) returned %d when it should have returned %d",
40 value, result, expected);
41 }
42}
43
44/**
45 * main
46 *
47 * executable entry point
48 */
49int __cdecl main(int argc, char **argv)
50{
51 struct test tests[] =
52 {
53 /* value expected */
54 { PAL_NEGINF, 2147483647 },
55 { 0, -2147483648 },
56 { PAL_POSINF, 2147483647 },
57 { 0.113314732f, -4 }, // expected: -(pi)
58 { 0.151955223f, -3 }, // expected: -(e)
59 { 0.202699566f, -3 }, // expected: -(ln(10))
60 { 0.336622537f, -2 }, // expected: -(pi / 2)
61 { 0.367879441f, -2 }, // expected: -(log2(e))
62 { 0.375214227f, -2 }, // expected: -(sqrt(2))
63 { 0.457429347f, -2 }, // expected: -(2 / sqrt(pi))
64 { 0.5f, -1 }, // expected: -(1)
65 { 0.580191810f, -1 }, // expected: -(pi / 4)
66 { 0.612547327f, -1 }, // expected: -(1 / sqrt(2))
67 { 0.618503138f, -1 }, // expected: -(ln(2))
68 { 0.643218242f, -1 }, // expected: -(2 / pi)
69 { 0.740055574f, -1 }, // expected: -(log10(e))
70 { 0.802008879f, -1 }, // expected: -(1 / pi)
71 { 1, 0 },
72 { 1.24686899f, 0 }, // expected: 1 / pi
73 { 1.35124987f, 0 }, // expected: log10(e)
74 { 1.55468228f, 0 }, // expected: 2 / pi
75 { 1.61680667f, 0 }, // expected: ln(2)
76 { 1.63252692f, 0 }, // expected: 1 / sqrt(2)
77 { 1.72356793f, 0 }, // expected: pi / 4
78 { 2, 1 },
79 { 2.18612996f, 1 }, // expected: 2 / sqrt(pi)
80 { 2.66514414f, 1 }, // expected: sqrt(2)
81 { 2.71828183f, 1 }, // expected: log2(e) value: e
82 { 2.97068642f, 1 }, // expected: pi / 2
83 { 4.93340967f, 2 }, // expected: ln(10)
84 { 6.58088599f, 2 }, // expected: e
85 { 8.82497783f, 3 }, // expected: pi
86 { PAL_NAN, 2147483647 },
87 };
88
89 if (PAL_Initialize(argc, argv) != 0)
90 {
91 return FAIL;
92 }
93
94 for (int i = 0; i < (sizeof(tests) / sizeof(struct test)); i++)
95 {
96 validate(tests[i].value, tests[i].expected);
97 }
98
99 PAL_Terminate();
100 return PASS;
101}
102