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/* mpfr_ui_div -- divide a machine integer by a floating-point number
mpfr_si_div -- divide a machine number by a floating-point number
Copyright 2000, 2001, 2002, 2003, 2004, 2005 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., 51 Franklin Place, Fifth Floor, Boston,
MA 02110-1301, USA. */
#define MPFR_NEED_LONGLONG_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_UNLIKELY(MPFR_IS_SINGULAR(x)))
{
if (MPFR_IS_NAN(x))
{
MPFR_SET_NAN(y);
MPFR_RET_NAN;
}
else if (MPFR_IS_INF(x)) /* u/Inf = 0 */
{
MPFR_SET_ZERO(y);
MPFR_SET_SAME_SIGN(y,x);
MPFR_RET(0);
}
else /* u / 0 */
{
MPFR_ASSERTD(MPFR_IS_ZERO(x));
if (u)
{
/* u > 0, so y = sign(x) * Inf */
MPFR_SET_SAME_SIGN(y, x);
MPFR_SET_INF(y);
MPFR_RET(0);
}
else
{
/* 0 / 0 */
MPFR_SET_NAN(y);
MPFR_RET_NAN;
}
}
}
else if (MPFR_LIKELY(u != 0))
{
MPFR_TMP_INIT1(up, uu, BITS_PER_MP_LIMB);
MPFR_ASSERTN(u == (mp_limb_t) u);
count_leading_zeros(cnt, (mp_limb_t) u);
up[0] = (mp_limb_t) u << cnt;
MPFR_SET_EXP (uu, BITS_PER_MP_LIMB - cnt);
return mpfr_div (y, uu, x, rnd_mode);
}
else /* u = 0, and x != 0 */
{
MPFR_SET_ZERO(y); /* if u=0, then set y to 0 */
MPFR_SET_SAME_SIGN(y, x); /* u considered as +0: sign(+0/x) = sign(x) */
MPFR_RET(0);
}
}
int mpfr_si_div (mpfr_ptr y, long int u, mpfr_srcptr x,mp_rnd_t rnd_mode)
{
int res;
if (u >= 0)
res = mpfr_ui_div (y, u, x, rnd_mode);
else
{
res = -mpfr_ui_div (y, -u, x, MPFR_INVERT_RND(rnd_mode));
MPFR_CHANGE_SIGN (y);
}
return res;
}
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