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annotate lib/isnanf-nolibm.h @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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ebb7ea0c94e8 Rename isnand.h to isnand-nolibm.h, similarly for isnanf.h.
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1 /* Test for NaN that does not need libm.
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2 Copyright (C) 2007-2019 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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16
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17 #if HAVE_ISNANF_IN_LIBC
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18 /* Get declaration of isnan macro or (older) isnanf function. */
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19 # include <math.h>
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20 # if __GNUC__ >= 4
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21 /* GCC 4.0 and newer provides three built-ins for isnan. */
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22 # undef isnanf
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23 # define isnanf(x) __builtin_isnanf ((float)(x))
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24 # elif defined isnan
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25 # undef isnanf
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26 # define isnanf(x) isnan ((float)(x))
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27 # else
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28 /* Get declaration of isnanf(), if not declared in <math.h>. */
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29 # if defined __sgi
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30 /* We can't include <ieeefp.h>, because it conflicts with our definition of
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31 isnand. Therefore declare isnanf separately. */
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32 extern int isnanf (float x);
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33 # endif
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34 # endif
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35 #else
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36 /* Test whether X is a NaN. */
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37 # undef isnanf
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38 # define isnanf rpl_isnanf
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39 extern int isnanf (float x);
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40 #endif