lib/isnanf-nolibm.h

   1 /* Test for NaN that does not need libm.
   2    Copyright (C) 2007-2020 Free Software Foundation, Inc.
   3
   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.
   8
   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.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #if HAVE_ISNANF_IN_LIBC
  18 /* Get declaration of isnan macro or (older) isnanf function.  */
  19 # include <math.h>
  20 # if (__GNUC__ >= 4) || (__clang_major__ >= 4)
  21    /* GCC >= 4.0 and clang provide a type-generic built-in for isnan.
  22       GCC >= 4.0 also provides __builtin_isnanf, but clang doesn't.  */
  23 #  undef isnanf
  24 #  define isnanf(x) __builtin_isnan ((float)(x))
  25 # elif defined isnan
  26 #  undef isnanf
  27 #  define isnanf(x) isnan ((float)(x))
  28 # else
  29    /* Get declaration of isnanf(), if not declared in <math.h>.  */
  30 #  if defined __sgi
  31    /* We can't include <ieeefp.h>, because it conflicts with our definition of
  32       isnand.  Therefore declare isnanf separately.  */
  33 extern int isnanf (float x);
  34 #  endif
  35 # endif
  36 #else
  37 /* Test whether X is a NaN.  */
  38 # undef isnanf
  39 # define isnanf rpl_isnanf
  40 extern int isnanf (float x);
  41 #endif