1 /* Test of signbit() substitute.
2 Copyright (C) 2007-2013 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
23 /* signbit must be a macro. */
25 # error missing declaration
31 #include "minus-zero.h"
37 long double zerol = 0.0L;
43 ASSERT (!signbit (3.141f));
44 ASSERT (!signbit (3.141e30f));
45 ASSERT (!signbit (3.141e-30f));
46 ASSERT (signbit (-2.718f));
47 ASSERT (signbit (-2.718e30f));
48 ASSERT (signbit (-2.718e-30f));
50 ASSERT (!signbit (0.0f));
51 if (1.0f / minus_zerof < 0)
52 ASSERT (signbit (minus_zerof));
54 ASSERT (!signbit (minus_zerof));
55 /* Infinite values. */
56 ASSERT (!signbit (Infinityf ()));
57 ASSERT (signbit (- Infinityf ()));
59 (void) signbit (zerof / zerof);
60 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
64 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
65 typedef union { float value; unsigned int word[NWORDS]; } memory_float;
67 m.value = zerof / zerof;
68 # if FLT_EXPBIT0_BIT > 0
69 m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
71 m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
72 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
74 if (FLT_EXPBIT0_WORD < NWORDS / 2)
75 m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
77 m.word[0] |= (unsigned int) 1;
78 (void) signbit (m.value);
88 ASSERT (!signbit (3.141));
89 ASSERT (!signbit (3.141e30));
90 ASSERT (!signbit (3.141e-30));
91 ASSERT (signbit (-2.718));
92 ASSERT (signbit (-2.718e30));
93 ASSERT (signbit (-2.718e-30));
95 ASSERT (!signbit (0.0));
96 if (1.0 / minus_zerod < 0)
97 ASSERT (signbit (minus_zerod));
99 ASSERT (!signbit (minus_zerod));
100 /* Infinite values. */
101 ASSERT (!signbit (Infinityd ()));
102 ASSERT (signbit (- Infinityd ()));
104 (void) signbit (zerod / zerod);
105 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
106 /* Signalling NaN. */
109 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
110 typedef union { double value; unsigned int word[NWORDS]; } memory_double;
112 m.value = zerod / zerod;
113 # if DBL_EXPBIT0_BIT > 0
114 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
116 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
117 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
119 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
120 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
121 (void) signbit (m.value);
131 ASSERT (!signbit (3.141L));
132 ASSERT (!signbit (3.141e30L));
133 ASSERT (!signbit (3.141e-30L));
134 ASSERT (signbit (-2.718L));
135 ASSERT (signbit (-2.718e30L));
136 ASSERT (signbit (-2.718e-30L));
138 ASSERT (!signbit (0.0L));
139 if (1.0L / minus_zerol < 0)
140 ASSERT (signbit (minus_zerol));
142 ASSERT (!signbit (minus_zerol));
143 /* Infinite values. */
144 ASSERT (!signbit (Infinityl ()));
145 ASSERT (signbit (- Infinityl ()));
147 (void) signbit (zerol / zerol);
148 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
149 /* Signalling NaN. */
152 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
153 typedef union { long double value; unsigned int word[NWORDS]; } memory_long_double;
154 memory_long_double m;
155 m.value = zerol / zerol;
156 # if LDBL_EXPBIT0_BIT > 0
157 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
159 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
160 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
162 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
163 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
164 (void) signbit (m.value);