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/* Copyright (C) 2017, bel2125
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/* Note: Within "check", this file uses the LGPL license.
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* If you need only this file, you may find a MIT licensed version in
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* the "floatmagic" repository of the initial author.
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*/
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#include "libcompat.h"
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double DOUBLE_ZERO = 0.0;
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#if defined(NEED_fpclassify)
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#if defined(HAVE_STDINT_H)
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#include <stdint.h>
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typedef uint64_t bitfield64;
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#elif defined(_MSC_VER)
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typedef unsigned __int64 bitfield64;
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#else
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typedef unsigned long long bitfield64;
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#endif
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static bitfield64 ms = 0x8000000000000000;
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static bitfield64 me = 0x7FF0000000000000;
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static bitfield64 mf = 0x000FFFFFFFFFFFFF;
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int fpclassify(double d)
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{
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bitfield64 *p = (bitfield64 *)&d;
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if ((*p & me) != me) {
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/* finite */
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if (*p & mf) {
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/* finite and not null */
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if (*p & me) {
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return FP_NORMAL;
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}
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return FP_SUBNORMAL;
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}
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return FP_ZERO;
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}
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if (*p & mf) {
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return FP_NAN;
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}
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return FP_INFINITE;
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}
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#endif
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