mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-05 14:29:28 +00:00
aa9bc17601
BMakefiles and other bits will follow. Requested by: Andrey Chernov Made world by: Chuck Robey
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/* __gmp_insert_double -- convert from array of mp_limb_t to double.
|
|
|
|
Copyright (C) 1996 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Library General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP 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 Library General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
|
|
MA 02111-1307, USA. */
|
|
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
|
|
#ifdef XDEBUG
|
|
#undef _GMP_IEEE_FLOATS
|
|
#endif
|
|
|
|
#ifndef _GMP_IEEE_FLOATS
|
|
#define _GMP_IEEE_FLOATS 0
|
|
#endif
|
|
|
|
double
|
|
#if __STDC__
|
|
__gmp_scale2 (double d, int exp)
|
|
#else
|
|
__gmp_scale2 (d, exp)
|
|
double d;
|
|
int exp;
|
|
#endif
|
|
{
|
|
#if _GMP_IEEE_FLOATS
|
|
{
|
|
union ieee_double_extract x;
|
|
x.d = d;
|
|
x.s.exp += exp;
|
|
return x.d;
|
|
}
|
|
#else
|
|
{
|
|
double factor, r;
|
|
|
|
factor = 2.0;
|
|
if (exp < 0)
|
|
{
|
|
factor = 0.5;
|
|
exp = -exp;
|
|
}
|
|
r = d;
|
|
while (exp != 0)
|
|
{
|
|
if ((exp & 1) != 0)
|
|
r *= factor;
|
|
factor *= factor;
|
|
exp >>= 1;
|
|
}
|
|
return r;
|
|
}
|
|
#endif
|
|
}
|