t_precision.c revision 272343 
1/* $NetBSD: t_precision.c,v 1.1 2013/11/11 11:10:45 joerg Exp $ */
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Joerg Sonnenberger.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: t_precision.c,v 1.1 2013/11/11 11:10:45 joerg Exp $");
33
34#include <atf-c.h>
35#include <atf-c/config.h>
36
37#include <float.h>
38#include <stdlib.h>
39
40ATF_TC(t_precision);
41
42ATF_TC_HEAD(t_precision, tc)
43{
44	atf_tc_set_md_var(tc, "descr",
45	    "Basic precision test for double and long double");
46}
47
48volatile double x = 1;
49volatile long double y = 1;
50
51ATF_TC_BODY(t_precision, tc)
52{
53	x += DBL_EPSILON;
54	ATF_CHECK(x != 1.0);
55	x -= 1;
56	ATF_CHECK(x == DBL_EPSILON);
57
58	x = 2;
59	x += DBL_EPSILON;
60	ATF_CHECK(x == 2.0);
61
62	y += LDBL_EPSILON;
63	ATF_CHECK(y != 1.0L);
64	y -= 1;
65	ATF_CHECK(y == LDBL_EPSILON);
66	y = 2;
67	y += LDBL_EPSILON;
68	ATF_CHECK(y == 2.0L);
69}
70
71ATF_TP_ADD_TCS(tp)
72{
73	ATF_TP_ADD_TC(tp, t_precision);
74
75	return atf_no_error();
76}
77