1 /* $NetBSD: t_precision.c,v 1.4 2024/05/06 15:46:31 riastradh 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 1.4 2024/05/06 15:46:31 riastradh Exp $");
33
34 #include <atf-c.h>
35
36 #include <float.h>
37 #include <stdlib.h>
38
39 ATF_TC(t_precision);
40
ATF_TC_HEAD(t_precision,tc)41 ATF_TC_HEAD(t_precision, tc)
42 {
43 atf_tc_set_md_var(tc, "descr",
44 "Basic precision test for double and long double");
45 }
46
47 volatile double x = 1;
48 volatile long double y = 1;
49
ATF_TC_BODY(t_precision,tc)50 ATF_TC_BODY(t_precision, tc)
51 {
52 x += DBL_EPSILON;
53 ATF_CHECK(x != 1.0);
54 x -= 1;
55 ATF_CHECK(x == DBL_EPSILON);
56
57 x = 2;
58 x += DBL_EPSILON;
59 ATF_CHECK(x == 2.0);
60
61 y += LDBL_EPSILON;
62 ATF_CHECK(y != 1.0L);
63 y -= 1;
64 ATF_CHECK(y == LDBL_EPSILON);
65 y = 2;
66 y += LDBL_EPSILON;
67 ATF_CHECK(y == 2.0L);
68 }
69
ATF_TP_ADD_TCS(tp)70 ATF_TP_ADD_TCS(tp)
71 {
72 ATF_TP_ADD_TC(tp, t_precision);
73
74 return atf_no_error();
75 }
76