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annotate lib/isnanf-nolibm.h @ 10264:ebb7ea0c94e8

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Rename isnand.h to isnand-nolibm.h, similarly for isnanf.h.
author Ben Pfaff <blp@cs.stanford.edu>
date Sat, 12 Jul 2008 10:41:34 -0700
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children b5e42ef33b49
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10264
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) 2007-2008 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
ebb7ea0c94e8 Rename isnand.h to isnand-nolibm.h, similarly for isnanf.h.
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7 (at your option) any later version.
ebb7ea0c94e8 Rename isnand.h to isnand-nolibm.h, similarly for isnanf.h.
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8
ebb7ea0c94e8 Rename isnand.h to isnand-nolibm.h, similarly for isnanf.h.
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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
ebb7ea0c94e8 Rename isnand.h to isnand-nolibm.h, similarly for isnanf.h.
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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 <http://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 # endif
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28 #else
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29 /* Test whether X is a NaN. */
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30 # undef isnanf
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31 # define isnanf rpl_isnanf
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32 extern int isnanf (float x);
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33 #endif