1 /* Test of isfinite() substitute.
2 Copyright (C) 2007 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 Ben Pfaff, 2007, using Bruno Haible's code as a
29 #define ASSERT(expr) \
34 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
42 long double zerol = 0.0L;
48 ASSERT (isfinite (0.0f));
49 /* Subnormal values. */
50 ASSERT (isfinite (FLT_MIN / 2));
51 ASSERT (isfinite (-FLT_MIN / 2));
53 ASSERT (isfinite (3.141f));
54 ASSERT (isfinite (3.141e30f));
55 ASSERT (isfinite (3.141e-30f));
56 ASSERT (isfinite (-2.718f));
57 ASSERT (isfinite (-2.718e30f));
58 ASSERT (isfinite (-2.718e-30f));
59 /* Infinite values. */
60 ASSERT (!isfinite (1.0f / 0.0f));
61 ASSERT (!isfinite (-1.0f / 0.0f));
63 ASSERT (!isfinite (zerof / zerof));
64 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
68 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
69 typedef union { float value; unsigned int word[NWORDS]; } memory_float;
71 m.value = zerof / zerof;
72 # if FLT_EXPBIT0_BIT > 0
73 m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
75 m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
76 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
78 if (FLT_EXPBIT0_WORD < NWORDS / 2)
79 m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
81 m.word[0] |= (unsigned int) 1;
82 ASSERT (!isfinite (m.value));
92 ASSERT (isfinite (0.0));
93 /* Subnormal values. */
94 ASSERT (isfinite (DBL_MIN / 2));
95 ASSERT (isfinite (-DBL_MIN / 2));
97 ASSERT (isfinite (3.141));
98 ASSERT (isfinite (3.141e30));
99 ASSERT (isfinite (3.141e-30));
100 ASSERT (isfinite (-2.718));
101 ASSERT (isfinite (-2.718e30));
102 ASSERT (isfinite (-2.718e-30));
103 /* Infinite values. */
104 ASSERT (!isfinite (1.0 / 0.0));
105 ASSERT (!isfinite (-1.0 / 0.0));
107 ASSERT (!isfinite (zerod / zerod));
108 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
109 /* Signalling NaN. */
112 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
113 typedef union { double value; unsigned int word[NWORDS]; } memory_double;
115 m.value = zerod / zerod;
116 # if DBL_EXPBIT0_BIT > 0
117 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
119 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
120 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
122 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
123 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
124 ASSERT (!isfinite (m.value));
134 ASSERT (isfinite (0.0L));
135 /* Subnormal values. */
136 ASSERT (isfinite (LDBL_MIN / 2));
137 ASSERT (isfinite (-LDBL_MIN / 2));
139 ASSERT (isfinite (3.141L));
140 ASSERT (isfinite (3.141e30L));
141 ASSERT (isfinite (3.141e-30L));
142 ASSERT (isfinite (-2.718L));
143 ASSERT (isfinite (-2.718e30L));
144 ASSERT (isfinite (-2.718e-30L));
145 /* Infinite values. */
146 ASSERT (!isfinite (1.0L / 0.0L));
147 ASSERT (!isfinite (-1.0L / 0.0L));
149 ASSERT (!isfinite (zerol / zerol));
150 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
151 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
152 it's a Signalling NaN. */
155 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
156 typedef union { unsigned int word[NWORDS]; long double value; }
158 memory_long_double m;
159 m.value = zerol / zerol;
160 # if LDBL_EXPBIT0_BIT > 0
161 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
163 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
164 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
166 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
167 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
168 ASSERT (!isfinite (m.value));