/* Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 GNU C 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 C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include "gmp.h"

#include "gmp-impl.h"

#include <ieee754.h>

#include <float.h>

#include <math.h>

/* Convert a multi-precision integer of the needed number of bits (64 for

   long double) and an integral power of two to a `long double' in IEEE854

   extended-precision format.  */

long double

__mpn_construct_long_double (mp_srcptr frac_ptr, int expt, int sign)

{

  union ieee854_long_double u;

  u.ieee.negative = sign;

  u.ieee.exponent = expt + IEEE854_LONG_DOUBLE_BIAS;

#if BITS_PER_MP_LIMB == 32

  u.ieee.mantissa1 = frac_ptr[0];

  u.ieee.mantissa0 = frac_ptr[1];

#elif BITS_PER_MP_LIMB == 64

  u.ieee.mantissa1 = frac_ptr[0] & (((mp_limb_t) 1 << 32) - 1);

  u.ieee.mantissa0 = frac_ptr[0] >> 32;

#else

  #error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"

#endif

  return u.d;

}