sysdeps/m68k/fpu/s_modf.c

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #define __LIBC_INTERNAL_MATH_INLINES
  20 #include <math.h>
  21
  22 #ifndef SUFF
  23 #define SUFF
  24 #endif
  25 #ifndef float_type
  26 #define float_type double
  27 #endif
  28
  29 #define CONCATX(a,b) __CONCAT(a,b)
  30 #define s(name) CONCATX(name,SUFF)
  31 #define m81(func) __m81_u(s(func))
  32
  33 float_type
  34 s(__modf) (float_type x, float_type *iptr)
  35 {
  36   float_type x_int, result;
  37   __asm ("fintrz%.x %1, %0" : "=f" (x_int) : "f" (x));
  38   *iptr = x_int;
  39   if (m81(__isinf) (x))
  40     {
  41       result = 0;
  42       if (x < 0)
  43         result = -result;
  44     }
  45   else if (x == 0)
  46     result = x;
  47   else
  48     result = x - x_int;
  49   return result;
  50 }
  51
  52 #define weak_aliasx(a,b) weak_alias(a,b)
  53 weak_aliasx(s(__modf), s(modf))