1  /* Return positive difference between arguments.
       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 <errno.h>
      20  #include <math.h>
      21  #include <math-narrow-eval.h>
      22  
      23  FLOAT
      24  M_DECL_FUNC (__fdim) (FLOAT x, FLOAT y)
      25  {
      26    if (islessequal (x, y))
      27      return 0;
      28  
      29    FLOAT r = math_narrow_eval (x - y);
      30    if (isinf (r) && !isinf (x) && !isinf (y))
      31      __set_errno (ERANGE);
      32  
      33    return r;
      34  }
      35  declare_mgen_alias (__fdim, fdim);