92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
|
/* mpf_div_ui -- Divide a float with an unsigned integer.
|
||
|
|
|
||
|
|
Copyright (C) 1993, 1994, 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"
|
||
|
|
#include "longlong.h"
|
||
|
|
|
||
|
|
void
|
||
|
|
#if __STDC__
|
||
|
|
mpf_div_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
|
||
|
|
#else
|
||
|
|
mpf_div_ui (r, u, v)
|
||
|
|
mpf_ptr r;
|
||
|
|
mpf_srcptr u;
|
||
|
|
unsigned long int v;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
mp_srcptr up;
|
||
|
|
mp_ptr rp, tp, rtp;
|
||
|
|
mp_size_t usize;
|
||
|
|
mp_size_t rsize, tsize;
|
||
|
|
mp_size_t sign_quotient;
|
||
|
|
mp_size_t prec;
|
||
|
|
mp_limb_t q_limb;
|
||
|
|
mp_exp_t rexp;
|
||
|
|
TMP_DECL (marker);
|
||
|
|
|
||
|
|
usize = u->_mp_size;
|
||
|
|
sign_quotient = usize;
|
||
|
|
usize = ABS (usize);
|
||
|
|
prec = r->_mp_prec;
|
||
|
|
|
||
|
|
if (v == 0)
|
||
|
|
v = 1 / v; /* divide by zero as directed */
|
||
|
|
if (usize == 0)
|
||
|
|
{
|
||
|
|
r->_mp_size = 0;
|
||
|
|
r->_mp_exp = 0;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
TMP_MARK (marker);
|
||
|
|
|
||
|
|
rp = r->_mp_d;
|
||
|
|
up = u->_mp_d;
|
||
|
|
|
||
|
|
tsize = 1 + prec;
|
||
|
|
tp = (mp_ptr) TMP_ALLOC ((tsize + 1) * BYTES_PER_MP_LIMB);
|
||
|
|
|
||
|
|
if (usize > tsize)
|
||
|
|
{
|
||
|
|
up += usize - tsize;
|
||
|
|
usize = tsize;
|
||
|
|
rtp = tp;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
MPN_ZERO (tp, tsize - usize);
|
||
|
|
rtp = tp + (tsize - usize);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Move the dividend to the remainder. */
|
||
|
|
MPN_COPY (rtp, up, usize);
|
||
|
|
|
||
|
|
mpn_divmod_1 (rp, tp, tsize, (mp_limb_t) v);
|
||
|
|
q_limb = rp[tsize - 1];
|
||
|
|
|
||
|
|
rsize = tsize - (q_limb == 0);
|
||
|
|
rexp = u->_mp_exp - (q_limb == 0);
|
||
|
|
r->_mp_size = sign_quotient >= 0 ? rsize : -rsize;
|
||
|
|
r->_mp_exp = rexp;
|
||
|
|
TMP_FREE (marker);
|
||
|
|
}
|