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/* mpfr_add_one_ulp -- add one unit in last place

Copyright 1999, 2001, 2002, 2003, 2004 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 "mpfr-impl.h"

/* sets x to x+sign(x)*ulp(x) */
int
mpfr_add_one_ulp (mpfr_ptr x, mp_rnd_t rnd_mode)
{
  mp_size_t xn;
  int sh;
  mp_limb_t *xp;

  if (MPFR_UNLIKELY( MPFR_IS_SINGULAR(x) ))
    {
      if (MPFR_IS_NAN(x))
	MPFR_RET_NAN;
      MPFR_ASSERTD (MPFR_IS_INF(x) || MPFR_IS_ZERO(x));
      MPFR_RET(0);
    }

  xn = MPFR_LIMB_SIZE(x);
  MPFR_UNSIGNED_MINUS_MODULO(sh, MPFR_PREC(x) );
  xp = MPFR_MANT(x);
  if (mpn_add_1 (xp, xp, xn, MPFR_LIMB_ONE << sh)) /* got 1.0000... */
    {
      mp_exp_t exp = MPFR_EXP (x);
      if (MPFR_UNLIKELY(exp == __gmpfr_emax))
        return mpfr_set_overflow(x, rnd_mode, MPFR_SIGN(x));
      else
        {
          MPFR_ASSERTD (exp < __gmpfr_emax);
          MPFR_SET_EXP (x, exp + 1);
	  /* The mantissa is already filled with 0 */
          xp[xn-1] = MPFR_LIMB_HIGHBIT;
        }
    }
  MPFR_RET(0);
}