set_d.c

/* mpf_set_d -- Assign a float from a double.

Copyright 1993, 1994, 1995, 1996, 2001, 2003, 2004 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 Lesser General Public License as published by
the Free Software Foundation; either version 3 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 Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */

#include "config.h"

#if HAVE_FLOAT_H
#include <float.h>  /* for DBL_MAX */
#endif

#include "gmp.h"
#include "gmp-impl.h"

void
mpf_set_d (mpf_ptr r, double d)
{
  int negative;

  DOUBLE_NAN_INF_ACTION (d,
                         __gmp_invalid_operation (),
                         __gmp_invalid_operation ());

  if (UNLIKELY (d == 0))
    {
      SIZ(r) = 0;
      EXP(r) = 0;
      return;
    }
  negative = d < 0;
  d = ABS (d);

  SIZ(r) = negative ? -LIMBS_PER_DOUBLE : LIMBS_PER_DOUBLE;
  EXP(r) = __gmp_extract_double (PTR(r), d);
}