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lib/fpclassify.c
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bel2125
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01 сен 2017, 11:47
01 сен 2017, 11:47
a1e98d6
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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