1/*-
2 * Copyright (c) 2010 David Schultz <das@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27/*
28 * Tests for nearbyint{,f,l}()
29 *
30 * TODO:
31 * - adapt tests for rint(3)
32 * - tests for harder values (more mantissa bits than float)
33 * - tests in other rounding modes
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include <assert.h>
40#include <fenv.h>
41#include <math.h>
42#include <stdio.h>
43
44#define	ALL_STD_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
45			 FE_OVERFLOW | FE_UNDERFLOW)
46
47/*
48 * Compare d1 and d2 using special rules: NaN == NaN and +0 != -0.
49 * Fail an assertion if they differ.
50 */
51static int
52fpequal(long double d1, long double d2)
53{
54
55	if (d1 != d2)
56		return (isnan(d1) && isnan(d2));
57	return (copysignl(1.0, d1) == copysignl(1.0, d2));
58}
59
60static void testit(int testnum, float in, float out)
61{
62
63    feclearexcept(ALL_STD_EXCEPT);
64    assert(fpequal(out, nearbyintf(in)));
65    assert(fpequal(-out, nearbyintf(-in)));
66    assert(fetestexcept(ALL_STD_EXCEPT) == 0);
67
68    assert(fpequal(out, nearbyint(in)));
69    assert(fpequal(-out, nearbyint(-in)));
70    assert(fetestexcept(ALL_STD_EXCEPT) == 0);
71
72    assert(fpequal(out, nearbyintl(in)));
73    assert(fpequal(-out, nearbyintl(-in)));
74    assert(fetestexcept(ALL_STD_EXCEPT) == 0);
75
76    printf("ok %d\t\t# nearbyint(%g)\n", testnum, in);
77}
78
79static const float tests[] = {
80/* input	output (expected) */
81    0.0,	0.0,
82    0.5,	0.0,
83    M_PI,	3,
84    65536.5,	65536,
85    INFINITY,	INFINITY,
86    NAN,	NAN,
87};
88
89int
90main(int argc, char *argv[])
91{
92	static const int ntests = sizeof(tests) / sizeof(tests[0]) / 2;
93	int i;
94
95	printf("1..%d\n", ntests);
96	for (i = 0; i < ntests; i++)
97		testit(i + 1, tests[i * 2], tests[i * 2 + 1]);
98
99	return (0);
100}
101