math/s_canonicalize_template.c

   1 /* Canonicalize floating-point representation.
   2    Copyright (C) 2016-2020 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20
  21 int
  22 M_DECL_FUNC (__canonicalize) (FLOAT *cx, const FLOAT *x)
  23 {
  24   FLOAT val = *x;
  25   /* For all binary formats supported by glibc, iscanonical only fails
  26      if the representation is not a valid representation of the type,
  27      so the only work to do is for signaling NaNs.  */
  28   if (!iscanonical (val))
  29     return 1;
  30   if (issignaling (val))
  31     *cx = val + val;
  32   else
  33     *cx = val;
  34   return 0;
  35 }
  36
  37 declare_mgen_alias (__canonicalize, canonicalize)