sysdeps/m68k/fpu/s_modf.c

   1 /* Copyright (C) 1996, 1997, 1999 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <math.h>
  20 #include "mathimpl.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   unsigned long x_cond;
  38
  39   __asm ("fintrz%.x %1, %0" : "=f" (x_int) : "f" (x));
  40   *iptr = x_int;
  41   x_cond = __m81_test (x);
  42   if (x_cond & __M81_COND_INF)
  43     {
  44       result = 0;
  45       if (x_cond & __M81_COND_NEG)
  46         result = -result;
  47     }
  48   else if (x_cond & __M81_COND_ZERO)
  49     result = x;
  50   else
  51     result = x - x_int;
  52   return result;
  53 }
  54
  55 #define weak_aliasx(a,b) weak_alias(a,b)
  56 weak_aliasx(s(__modf), s(modf))