math/s_fmaxmag_template.c

   1 /* Return value with maximum magnitude.
   2    Copyright (C) 2016-2018 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 #include <math.h>
  20 #include <math_private.h>
  21
  22 FLOAT
  23 M_DECL_FUNC (__fmaxmag) (FLOAT x, FLOAT y)
  24 {
  25   FLOAT ax = M_FABS (x);
  26   FLOAT ay = M_FABS (y);
  27   if (isgreater (ax, ay))
  28     return x;
  29   else if (isless (ax, ay))
  30     return y;
  31   else if (ax == ay)
  32     return x > y ? x : y;
  33   else if (issignaling (x) || issignaling (y))
  34     return x + y;
  35   else
  36     return isnan (y) ? x : y;
  37 }
  38
  39 declare_mgen_alias (__fmaxmag, fmaxmag);