math/s_fmax_template.c

   1 /* Return maximum numeric value of X and Y.
   2    Copyright (C) 1997-2023 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 #include <math-use-builtins.h>
  21
  22 FLOAT
  23 M_DECL_FUNC (__fmax) (FLOAT x, FLOAT y)
  24 {
  25 #if M_USE_BUILTIN (FMAX)
  26   return M_SUF (__builtin_fmax) (x, y);
  27 #else
  28   if (isgreaterequal (x, y))
  29     return x;
  30   else if (isless (x, y))
  31     return y;
  32   else if (issignaling (x) || issignaling (y))
  33     return x + y;
  34   else
  35     return isnan (y) ? x : y;
  36 #endif
  37 }
  38
  39 declare_mgen_alias (__fmax, fmax);