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/* mpfr_ui_div -- divide a machine integer by a floating-point number
Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The MPFR 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 MPFR 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 MPFR 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 <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
#include "mpfr.h"
#include "mpfr-impl.h"
int
mpfr_ui_div (mpfr_ptr y, unsigned long int u, mpfr_srcptr x, mp_rnd_t rnd_mode)
{
mpfr_t uu;
mp_limb_t up[1];
unsigned long cnt;
if (MPFR_IS_NAN(x))
{
MPFR_SET_NAN(y);
MPFR_RET_NAN;
}
MPFR_CLEAR_NAN(y);
if (MPFR_IS_INF(x)) /* u/Inf = 0 */
{
MPFR_CLEAR_INF(y);
MPFR_SET_ZERO(y);
if (MPFR_SIGN(x) != MPFR_SIGN(y))
MPFR_CHANGE_SIGN(y);
MPFR_RET(0);
}
MPFR_CLEAR_INF(y);
if (u)
{
MPFR_INIT1(up, uu, BITS_PER_MP_LIMB, 1);
MPFR_ASSERTN(u == (mp_limb_t) u);
count_leading_zeros(cnt, (mp_limb_t) u);
*up = (mp_limb_t) u << cnt;
MPFR_EXP(uu) = BITS_PER_MP_LIMB-cnt;
return mpfr_div (y, uu, x, rnd_mode);
}
else /* u = 0 */
{
if (MPFR_IS_ZERO(x)) /* 0/0 */
{
MPFR_SET_NAN(y);
MPFR_RET_NAN;
}
else
{
MPFR_SET_ZERO(y); /* if u=0, then set y to 0 */
MPFR_RET(0);
}
}
}
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