sysdeps/ieee754/bits/inf.h

   1 /* `INFINITY' constant for IEEE 754 machines.
   2    Copyright (C) 2004-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _MATH_H
  20 # error "Never use <bits/inf.h> directly; include <math.h> instead."
  21 #endif
  22
  23 /* IEEE positive infinity.  */
  24
  25 #if __GNUC_PREREQ(3,3)
  26 # define INFINITY       (__builtin_inff())
  27 #else
  28 # define INFINITY       HUGE_VALF
  29 #endif