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/* mpfr_div_2exp -- divide a floating-point number by a power of two
Copyright (C) 1999 Free Software Foundation.
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 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 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 Library General Public
License for more details.
You should have received a copy of the GNU Library 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 "mpfr.h"
#include "mpfr-impl.h"
int
#if __STDC__
mpfr_div_2exp (mpfr_ptr y, mpfr_srcptr x, unsigned long int n, mp_rnd_t rnd_mode)
#else
mpfr_div_2exp (y, x, n, rnd_mode)
mpfr_ptr y;
mpfr_srcptr x;
unsigned long int n;
mp_rnd_t rnd_mode;
#endif
{
int inexact = 0;
/* Important particular case */
if (y != x)
inexact = mpfr_set (y, x, rnd_mode);
return ((MPFR_EXP(y) -= n) < __mpfr_emin)
? mpfr_set_underflow (y, rnd_mode, MPFR_SIGN(y)) : inexact;
}
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