sysdeps/ieee754/ldbl-96/bits/iscanonical.h

   1 /* Define iscanonical macro.  ldbl-96 version.
   2    Copyright (C) 2016 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/iscanonical.h> directly; include <math.h> instead."
  21 #endif
  22
  23 extern int __iscanonicall (long double __x)
  24      __THROW __attribute__ ((__const__));
  25
  26 /* Return nonzero value if X is canonical.  In IEEE interchange binary
  27    formats, all values are canonical, but the argument must still be
  28    converted to its semantic type for any exceptions arising from the
  29    conversion, before being discarded; in extended precision, there
  30    are encodings that are not consistently handled as corresponding to
  31    any particular value of the type, and we return 0 for those.  */
  32 #define iscanonical(x)                          \
  33   (sizeof (x) == sizeof (long double)           \
  34    ? __iscanonicall (x)                         \
  35    : ((void) (__typeof (x)) (x), 1))