1/* $NetBSD: t_fpsetround.c,v 1.6 2011/10/01 17:46:10 christos Exp $ */
2
3/*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38#include <sys/cdefs.h>
39__RCSID("$NetBSD: t_fpsetround.c,v 1.6 2011/10/01 17:46:10 christos Exp $");
40
41#include <float.h>
42#include <math.h>
43#include <stdlib.h>
44#include <string.h>
45#include <stdio.h>
46
47#include <atf-c.h>
48
49ATF_TC(fpsetround_basic);
50ATF_TC_HEAD(fpsetround_basic, tc)
51{
52
53	atf_tc_set_md_var(tc, "descr",
54	    "Minimal testing of fpgetround(3) and fpsetround(3)");
55}
56
57#ifdef _FLOAT_IEEE754
58#include <ieeefp.h>
59
60static const struct {
61	const char *n;
62	int rm;
63	int rf;
64} rnd[] = {
65	{ "RN", FP_RN, 1 },
66	{ "RP", FP_RP, 2 },
67	{ "RM", FP_RM, 3 },
68	{ "RZ", FP_RZ, 0 },
69
70};
71
72static const struct {
73	const char *n;
74	int v[4];
75} tst[] = {	/*  RN  RP  RM  RZ */
76	{  "1.1", {  1,  1,  2,  1 } },
77	{  "1.5", {  1,  2,  2,  1 } },
78	{  "1.9", {  1,  2,  2,  1 } },
79	{  "2.1", {  2,  2,  3,  2 } },
80	{  "2.5", {  2,  2,  3,  2 } },
81	{  "2.9", {  2,  3,  3,  2 } },
82	{ "-1.1", { -1, -1, -1, -2 } },
83	{ "-1.5", { -1, -2, -1, -2 } },
84	{ "-1.9", { -1, -2, -1, -2 } },
85	{ "-2.1", { -2, -2, -2, -3 } },
86	{ "-2.5", { -2, -2, -2, -3 } },
87	{ "-2.9", { -2, -3, -2, -3 } },
88};
89
90static const char *
91getname(int r)
92{
93	for (size_t i = 0; i < __arraycount(rnd); i++)
94		if (rnd[i].rm == r)
95			return rnd[i].n;
96	return "*unknown*";
97}
98
99static void
100test(int r)
101{
102	int did = 0;
103	for (size_t i = 0; i < __arraycount(tst); i++) {
104		double d = strtod(tst[i].n, NULL);
105		int g = (int)rint(d);
106		int e = tst[i].v[r];
107		ATF_CHECK_EQ(g, e);
108		if (g != e) {
109			if (!did) {
110				fprintf(stderr, "Mode Value Result Expected\n");
111				did = 1;
112			}
113			fprintf(stderr, "%4.4s %-5.5s %6d %8d\n", rnd[r].n,
114			    tst[i].n, (int)rint(d), tst[i].v[r]);
115		}
116	}
117}
118#endif
119
120
121ATF_TC_BODY(fpsetround_basic, tc)
122{
123
124#ifndef _FLOAT_IEEE754
125	atf_tc_skip("Test not applicable on this architecture.");
126#else
127	int r;
128
129	ATF_CHECK_EQ(r = fpgetround(), FP_RN);
130	if (FP_RN != r)
131		fprintf(stderr, "default expected=%s got=%s\n", getname(FP_RN),
132		    getname(r));
133	ATF_CHECK_EQ(FLT_ROUNDS, 1);
134
135	for (size_t i = 0; i < __arraycount(rnd); i++) {
136		const size_t j = (i + 1) & 3;
137		const int o = rnd[i].rm;
138		const int n = rnd[j].rm;
139
140		ATF_CHECK_EQ(r = fpsetround(n), o);
141		if (o != r)
142			fprintf(stderr, "set %s expected=%s got=%s\n",
143			    getname(n), getname(o), getname(r));
144		ATF_CHECK_EQ(r = fpgetround(), n);
145		if (n != r)
146			fprintf(stderr, "get expected=%s got=%s\n", getname(n),
147			    getname(r));
148		ATF_CHECK_EQ(r = FLT_ROUNDS, rnd[j].rf);
149		if (r != rnd[j].rf)
150			fprintf(stderr, "rounds expected=%x got=%x\n",
151			    rnd[j].rf, r);
152		test(r);
153	}
154#endif /* _FLOAT_IEEE754 */
155}
156
157ATF_TP_ADD_TCS(tp)
158{
159
160	ATF_TP_ADD_TC(tp, fpsetround_basic);
161
162	return atf_no_error();
163}
164