/* Set NaN payload.  dbl-64/wordsize-64 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-double.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 0x3ff

#define PAYLOAD_DIG 51

#define EXPLICIT_MANT_DIG 52

int

FUNC (double *x, double payload)

{

  uint64_t ix;

  EXTRACT_WORDS64 (ix, payload);

  int exponent = ix >> EXPLICIT_MANT_DIG;

  /* 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 && ix == 0))

      || (ix & ((1ULL << (BIAS + EXPLICIT_MANT_DIG - exponent)) - 1)) != 0)

    {

      INSERT_WORDS64 (*x, 0);

      return 1;

    }

  if (ix != 0)

    {

      ix &= (1ULL << EXPLICIT_MANT_DIG) - 1;

      ix |= 1ULL << EXPLICIT_MANT_DIG;

      ix >>= BIAS + EXPLICIT_MANT_DIG - exponent;

    }

  ix |= 0x7ff0000000000000ULL | (SET_HIGH_BIT ? 0x8000000000000ULL : 0);

  INSERT_WORDS64 (*x, ix);

  return 0;

}