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/* 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
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