1 /* Test of signbit() 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 2, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
27 #define ASSERT(expr) if (!(expr)) abort ();
31 long double zerol = 0.0L;
37 ASSERT (!signbit (3.141f));
38 ASSERT (!signbit (3.141e30f));
39 ASSERT (!signbit (3.141e-30f));
40 ASSERT (signbit (-2.718f));
41 ASSERT (signbit (-2.718e30f));
42 ASSERT (signbit (-2.718e-30f));
43 /* Infinite values. */
44 ASSERT (!signbit (1.0f / 0.0f));
45 ASSERT (signbit (-1.0f / 0.0f));
47 (void) signbit (zerof / zerof);
48 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
52 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
53 typedef union { float value; unsigned int word[NWORDS]; } memory_float;
55 m.value = zerof / zerof;
56 # if FLT_EXPBIT0_BIT > 0
57 m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
59 m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
60 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
62 if (FLT_EXPBIT0_WORD < NWORDS / 2)
63 m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
65 m.word[0] |= (unsigned int) 1;
66 (void) signbit (m.value);
76 ASSERT (!signbit (3.141));
77 ASSERT (!signbit (3.141e30));
78 ASSERT (!signbit (3.141e-30));
79 ASSERT (signbit (-2.718));
80 ASSERT (signbit (-2.718e30));
81 ASSERT (signbit (-2.718e-30));
82 /* Infinite values. */
83 ASSERT (!signbit (1.0 / 0.0));
84 ASSERT (signbit (-1.0 / 0.0));
86 (void) signbit (zerod / zerod);
87 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
91 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
92 typedef union { double value; unsigned int word[NWORDS]; } memory_double;
94 m.value = zerod / zerod;
95 # if DBL_EXPBIT0_BIT > 0
96 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
98 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
99 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
101 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
102 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
103 (void) signbit (m.value);
113 ASSERT (!signbit (3.141L));
114 ASSERT (!signbit (3.141e30L));
115 ASSERT (!signbit (3.141e-30L));
116 ASSERT (signbit (-2.718L));
117 ASSERT (signbit (-2.718e30L));
118 ASSERT (signbit (-2.718e-30L));
119 /* Infinite values. */
120 ASSERT (!signbit (1.0L / 0.0L));
121 ASSERT (signbit (-1.0L / 0.0L));
123 (void) signbit (zerol / zerol);
124 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
125 /* Signalling NaN. */
128 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
129 typedef union { long double value; unsigned int word[NWORDS]; } memory_long_double;
130 memory_long_double m;
131 m.value = zerol / zerol;
132 # if LDBL_EXPBIT0_BIT > 0
133 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
135 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
136 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
138 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
139 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
140 (void) signbit (m.value);