1 /* Test of isnand() substitute.
2 Copyright (C) 2007-2008 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. */
25 #define ASSERT(expr) \
30 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
41 ASSERT (!isnand (3.141));
42 ASSERT (!isnand (3.141e30));
43 ASSERT (!isnand (3.141e-30));
44 ASSERT (!isnand (-2.718));
45 ASSERT (!isnand (-2.718e30));
46 ASSERT (!isnand (-2.718e-30));
47 ASSERT (!isnand (0.0));
48 ASSERT (!isnand (-0.0));
49 /* Infinite values. */
50 ASSERT (!isnand (1.0 / 0.0));
51 ASSERT (!isnand (-1.0 / 0.0));
53 ASSERT (isnand (NaNd ()));
54 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
58 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
59 typedef union { double value; unsigned int word[NWORDS]; } memory_double;
62 # if DBL_EXPBIT0_BIT > 0
63 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
65 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
66 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
68 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
69 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
70 ASSERT (isnand (m.value));