t_fpclassify.c revision 272343 
1/* $NetBSD: t_fpclassify.c,v 1.3 2011/10/01 21:47:08 christos Exp $ */
2
3/*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <atf-c.h>
30
31#include <float.h>
32#include <math.h>
33#include <stdio.h>
34#include <string.h>
35
36#ifndef _FLOAT_IEEE754
37
38ATF_TC(no_test);
39ATF_TC_HEAD(no_test, tc)
40{
41	atf_tc_set_md_var(tc, "descr", "Dummy test");
42}
43
44ATF_TC_BODY(no_test,tc)
45{
46	atf_tc_skip("Test not available on this architecture");
47}
48
49#else /* defined(_FLOAT_IEEE754) */
50
51ATF_TC(fpclassify_float);
52ATF_TC_HEAD(fpclassify_float, tc)
53{
54
55	atf_tc_set_md_var(tc, "descr", "Test float operations");
56}
57
58ATF_TC_BODY(fpclassify_float, tc)
59{
60	float d0, d1, d2, f, ip;
61	int e, i;
62
63	d0 = FLT_MIN;
64	ATF_REQUIRE_EQ(fpclassify(d0), FP_NORMAL);
65	f = frexpf(d0, &e);
66	ATF_REQUIRE_EQ(e, FLT_MIN_EXP);
67	ATF_REQUIRE_EQ(f, 0.5);
68	d1 = d0;
69
70	/* shift a "1" bit through the mantissa (skip the implicit bit) */
71	for (i = 1; i < FLT_MANT_DIG; i++) {
72		d1 /= 2;
73		ATF_REQUIRE_EQ(fpclassify(d1), FP_SUBNORMAL);
74		ATF_REQUIRE(d1 > 0 && d1 < d0);
75
76		d2 = ldexpf(d0, -i);
77		ATF_REQUIRE_EQ(d2, d1);
78
79		d2 = modff(d1, &ip);
80		ATF_REQUIRE_EQ(d2, d1);
81		ATF_REQUIRE_EQ(ip, 0);
82
83		f = frexpf(d1, &e);
84		ATF_REQUIRE_EQ(e, FLT_MIN_EXP - i);
85		ATF_REQUIRE_EQ(f, 0.5);
86	}
87
88	d1 /= 2;
89	ATF_REQUIRE_EQ(fpclassify(d1), FP_ZERO);
90	f = frexpf(d1, &e);
91	ATF_REQUIRE_EQ(e, 0);
92	ATF_REQUIRE_EQ(f, 0);
93}
94
95ATF_TC(fpclassify_double);
96ATF_TC_HEAD(fpclassify_double, tc)
97{
98
99	atf_tc_set_md_var(tc, "descr", "Test double operations");
100}
101
102ATF_TC_BODY(fpclassify_double, tc)
103{
104	double d0, d1, d2, f, ip;
105	int e, i;
106
107	d0 = DBL_MIN;
108	ATF_REQUIRE_EQ(fpclassify(d0), FP_NORMAL);
109	f = frexp(d0, &e);
110	ATF_REQUIRE_EQ(e, DBL_MIN_EXP);
111	ATF_REQUIRE_EQ(f, 0.5);
112	d1 = d0;
113
114	/* shift a "1" bit through the mantissa (skip the implicit bit) */
115	for (i = 1; i < DBL_MANT_DIG; i++) {
116		d1 /= 2;
117		ATF_REQUIRE_EQ(fpclassify(d1), FP_SUBNORMAL);
118		ATF_REQUIRE(d1 > 0 && d1 < d0);
119
120		d2 = ldexp(d0, -i);
121		ATF_REQUIRE_EQ(d2, d1);
122
123		d2 = modf(d1, &ip);
124		ATF_REQUIRE_EQ(d2, d1);
125		ATF_REQUIRE_EQ(ip, 0);
126
127		f = frexp(d1, &e);
128		ATF_REQUIRE_EQ(e, DBL_MIN_EXP - i);
129		ATF_REQUIRE_EQ(f, 0.5);
130	}
131
132	d1 /= 2;
133	ATF_REQUIRE_EQ(fpclassify(d1), FP_ZERO);
134	f = frexp(d1, &e);
135	ATF_REQUIRE_EQ(e, 0);
136	ATF_REQUIRE_EQ(f, 0);
137}
138
139/*
140 * XXX NetBSD doesn't have long-double flavors of frexp, ldexp, and modf,
141 * XXX so this test is disabled.
142 */
143
144#ifdef TEST_LONG_DOUBLE
145
146ATF_TC(fpclassify_long_double);
147ATF_TC_HEAD(fpclassify_long_double, tc)
148{
149
150	atf_tc_set_md_var(tc, "descr", "Test long double operations");
151}
152
153ATF_TC_BODY(fpclassify_long_double, tc)
154{
155	long double d0, d1, d2, f, ip;
156	int e, i;
157
158	d0 = LDBL_MIN;
159	ATF_REQUIRE_EQ(fpclassify(d0), FP_NORMAL);
160	f = frexpl(d0, &e);
161	ATF_REQUIRE_EQ(e, LDBL_MIN_EXP);
162	ATF_REQUIRE_EQ(f, 0.5);
163	d1 = d0;
164
165	/* shift a "1" bit through the mantissa (skip the implicit bit) */
166	for (i = 1; i < LDBL_MANT_DIG; i++) {
167		d1 /= 2;
168		ATF_REQUIRE_EQ(fpclassify(d1), FP_SUBNORMAL);
169		ATF_REQUIRE(d1 > 0 && d1 < d0);
170
171		d2 = ldexpl(d0, -i);
172		ATF_REQUIRE_EQ(d2, d1);
173
174		d2 = modfl(d1, &ip);
175		ATF_REQUIRE_EQ(d2, d1);
176		ATF_REQUIRE_EQ(ip, 0);
177
178		f = frexpl(d1, &e);
179		ATF_REQUIRE_EQ(e, LDBL_MIN_EXP - i);
180		ATF_REQUIRE_EQ(f, 0.5);
181	}
182
183	d1 /= 2;
184	ATF_REQUIRE_EQ(fpclassify(d1), FP_ZERO);
185	f = frexpl(d1, &e);
186	ATF_REQUIRE_EQ(e, 0);
187	ATF_REQUIRE_EQ(f, 0);
188}
189#endif /* TEST_LONG_DOUBLE */
190#endif /* _FLOAT_IEEE754 */
191
192ATF_TP_ADD_TCS(tp)
193{
194
195#ifndef _FLOAT_IEEE754
196	ATF_TP_ADD_TC(tp, no_test);
197#else
198	ATF_TP_ADD_TC(tp, fpclassify_float);
199	ATF_TP_ADD_TC(tp, fpclassify_double);
200#ifdef TEST_LONG_DOUBLE
201	ATF_TP_ADD_TC(tp, fpclassify_long_double);
202#endif /* TEST_LONG_DOUBLE */
203#endif /* _FLOAT_IEEE754 */
204
205	return atf_no_error();
206}
207