mirror of
https://github.com/reactos/reactos.git
synced 2024-09-12 13:54:41 +00:00
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* Math functions for i387.
|
|
Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by John C. Bowman <bowman@ipp-garching.mpg.de>, 1995.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <precomp.h>
|
|
#include <math.h>
|
|
#include <float.h>
|
|
|
|
double ldexp (double value, int exp)
|
|
{
|
|
register double result;
|
|
#ifndef __GNUC__
|
|
register double __dy = (double)exp;
|
|
#endif
|
|
|
|
/* Check for value correctness
|
|
* and set errno if required
|
|
*/
|
|
if (_isnan(value))
|
|
{
|
|
errno = EDOM;
|
|
}
|
|
|
|
#ifdef __GNUC__
|
|
asm ("fscale"
|
|
: "=t" (result)
|
|
: "0" (value), "u" ((double)exp)
|
|
: "1");
|
|
#else /* !__GNUC__ */
|
|
__asm
|
|
{
|
|
fld __dy
|
|
fld value
|
|
fscale
|
|
fstp result
|
|
}
|
|
#endif /* !__GNUC__ */
|
|
return result;
|
|
}
|
|
|