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/* Copyright (C) 1995,1996,1997,1998,1999,2002,2003

        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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <config.h>

#include <float.h>

#include <math.h>

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

/* Convert a multi-precision integer of the needed number of bits (113 for

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

   quad-precision format.  */

__float128

mpn_construct_float128 (mp_srcptr frac_ptr, int expt, int sign)

{

  ieee854_float128 u;

  u.ieee.negative = sign;

  u.ieee.exponent = expt + IEEE854_FLOAT128_BIAS;

#if BITS_PER_MP_LIMB == 32

  u.ieee.mant_low = (((uint64_t) frac_ptr[1]) << 32)

                    | (frac_ptr[0] & 0xffffffff);

  u.ieee.mant_high = (((uint64_t) frac_ptr[3]

                       & (((mp_limb_t) 1 << (FLT128_MANT_DIG - 96)) - 1))

                      << 32) | (frac_ptr[2] & 0xffffffff);

#elif BITS_PER_MP_LIMB == 64

  u.ieee.mant_low = frac_ptr[0];

  u.ieee.mant_high = frac_ptr[1]

                     & (((mp_limb_t) 1 << (FLT128_MANT_DIG - 64)) - 1);

#else

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

#endif

  return u.value;

}