/* Set NaN payload.  ldbl-128 version.

   Copyright (C) 2016-2018 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 <math.h>

#include <math_private.h>

#include <libm-alias-ldouble.h>

#include <nan-high-order-bit.h>

#include <stdint.h>

#define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG)

#define BIAS 0x3fff

#define PAYLOAD_DIG 111

#define EXPLICIT_MANT_DIG 112

int

FUNC (_Float128 *x, _Float128 payload)

{

  uint64_t hx, lx;

  GET_LDOUBLE_WORDS64 (hx, lx, payload);

  int exponent = hx >> (EXPLICIT_MANT_DIG - 64);

  /* Test if argument is (a) negative or too large; (b) too small,

     except for 0 when allowed; (c) not an integer.  */

  if (exponent >= BIAS + PAYLOAD_DIG

      || (exponent < BIAS && !(SET_HIGH_BIT && hx == 0 && lx == 0)))

    {

      SET_LDOUBLE_WORDS64 (*x, 0, 0);

      return 1;

    }

  int shift = BIAS + EXPLICIT_MANT_DIG - exponent;

  if (shift < 64

      ? (lx & ((1ULL << shift) - 1)) != 0

      : (lx != 0 || (hx & ((1ULL << (shift - 64)) - 1)) != 0))

    {

      SET_LDOUBLE_WORDS64 (*x, 0, 0);

      return 1;

    }

  if (exponent != 0)

    {

      hx &= (1ULL << (EXPLICIT_MANT_DIG - 64)) - 1;

      hx |= 1ULL << (EXPLICIT_MANT_DIG - 64);

      if (shift >= 64)

	{

	  lx = hx >> (shift - 64);

	  hx = 0;

	}

      else if (shift != 0)

	{

	  lx = (lx >> shift) | (hx << (64 - shift));

	  hx >>= shift;

	}

    }

  hx |= 0x7fff000000000000ULL | (SET_HIGH_BIT ? 0x800000000000ULL : 0);

  SET_LDOUBLE_WORDS64 (*x, hx, lx);

  return 0;

}