reactos/lib/sdk/crt/math/i386/ldexp.c

   1 /* Math functions for i387.
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by John C. Bowman <bowman@ipp-garching.mpg.de>, 1995.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.
  20 */
  21
  22 #include <math.h>
  23
  24 double ldexp (double __x, int __y);
  25
  26 double ldexp (double __x, int __y)
  27 {
  28   register double __val;
  29 #ifdef __GNUC__
  30   __asm __volatile__
  31     ("fscale"
  32      : "=t" (__val) : "0" (__x), "u" ((double) __y));
  33 #else
  34   register double __dy = (double)__y;
  35   __asm
  36   {
  37     fld __dy
  38     fld __x
  39     fscale
  40     fstp __val
  41   }
  42 #endif /*__GNUC__*/
  43   return __val;
  44 }