1 /* Test of isnanf() 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 Bruno Haible <bruno@clisp.org>, 2007. */
27 #define ASSERT(expr) \
32 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
38 /* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0. */
43 static float zero = 0.0f;
47 # define NaN() (0.0f / 0.0f)
54 ASSERT (!isnanf (3.141f));
55 ASSERT (!isnanf (3.141e30f));
56 ASSERT (!isnanf (3.141e-30f));
57 ASSERT (!isnanf (-2.718f));
58 ASSERT (!isnanf (-2.718e30f));
59 ASSERT (!isnanf (-2.718e-30f));
60 /* Infinite values. */
61 ASSERT (!isnanf (1.0f / 0.0f));
62 ASSERT (!isnanf (-1.0f / 0.0f));
64 ASSERT (isnanf (NaN ()));
65 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
69 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
70 typedef union { float value; unsigned int word[NWORDS]; } memory_float;
73 # if FLT_EXPBIT0_BIT > 0
74 m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
76 m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
77 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
79 if (FLT_EXPBIT0_WORD < NWORDS / 2)
80 m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
82 m.word[0] |= (unsigned int) 1;
83 ASSERT (isnanf (m.value));