/* Copyright (C) 2017, bel2125

 *

 * This 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.

 *

 * This 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 this library; if not, write to the

 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,

 * MA 02110-1301, USA.

 */

/* Note: Within "check", this file uses the LGPL license.

 * If you need only this file, you may find a MIT licensed version in

 * the "floatmagic" repository of the initial author.

 */

#include "libcompat.h"

double DOUBLE_ZERO = 0.0;

#if defined(NEED_fpclassify)

#if defined(HAVE_STDINT_H)

#include <stdint.h>

typedef uint64_t bitfield64;

#elif defined(_MSC_VER)

typedef unsigned __int64 bitfield64;

#else

typedef unsigned long long bitfield64;

#endif

static bitfield64 ms = 0x8000000000000000;

static bitfield64 me = 0x7FF0000000000000;

static bitfield64 mf = 0x000FFFFFFFFFFFFF;

int fpclassify(double d) 

{

  bitfield64 *p = (bitfield64 *)&d;

  if ((*p & me) != me) {

    /* finite */

    if (*p & mf) {

      /* finite and not null */

      if (*p & me) {

        return FP_NORMAL;

      }

      return FP_SUBNORMAL;

    }	

    return FP_ZERO;

  }

  if (*p & mf) {

    return FP_NAN;

  }

  return FP_INFINITE;

}

#endif