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 ilogb returns correct values.
10**
11**===================================================================*/
12
13#include <palsuite.h>
14
15#define PAL_NAN sqrt(-1.0)
16#define PAL_POSINF -log(0.0)
17#define PAL_NEGINF log(0.0)
18
19/**
20 * Helper test structure
21 */
22struct test
23{
24 double 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(double value, int expected)
34{
35 int result = ilogb(value);
36
37 if (result != expected)
38 {
39 Fail("ilogb(%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 { 0.11331473229676087, -4 }, // expected: -(pi)
58 { 0.15195522325791297, -3 }, // expected: -(e)
59 { 0.20269956628651730, -3 }, // expected: -(ln(10))
60 { 0.33662253682241906, -2 }, // expected: -(pi / 2)
61 { 0.36787944117144232, -2 }, // expected: -(log2(e))
62 { 0.37521422724648177, -2 }, // expected: -(sqrt(2))
63 { 0.45742934732229695, -2 }, // expected: -(2 / sqrt(pi))
64 { 0.5, -1 }, // expected: -(1)
65 { 0.58019181037172444, -1 }, // expected: -(pi / 4)
66 { 0.61254732653606592, -1 }, // expected: -(1 / sqrt(2))
67 { 0.61850313780157598, -1 }, // expected: -(ln(2))
68 { 0.64321824193300488, -1 }, // expected: -(2 / pi)
69 { 0.74005557395545179, -1 }, // expected: -(log10(e))
70 { 0.80200887896145195, -1 }, // expected: -(1 / pi)
71 { 1, 0 },
72 { 1.2468689889006383, 0 }, // expected: 1 / pi
73 { 1.3512498725672678, 0 }, // expected: log10(e)
74 { 1.5546822754821001, 0 }, // expected: 2 / pi
75 { 1.6168066722416747, 0 }, // expected: ln(2)
76 { 1.6325269194381528, 0 }, // expected: 1 / sqrt(2)
77 { 1.7235679341273495, 0 }, // expected: pi / 4
78 { 2, 1 },
79 { 2.1861299583286618, 1 }, // expected: 2 / sqrt(pi)
80 { 2.6651441426902252, 1 }, // expected: sqrt(2)
81 { 2.7182818284590452, 1 }, // expected: log2(e) value: e
82 { 2.9706864235520193, 1 }, // expected: pi / 2
83 { 4.9334096679145963, 2 }, // expected: ln(10)
84 { 6.5808859910179210, 2 }, // expected: e
85 { 8.8249778270762876, 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