5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
190 lines
5.2 KiB
C
190 lines
5.2 KiB
C
/*-
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* Copyright (c) 2013 Jonas 'Sortie' Termansen.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef INCLUDE_IEEE754_H
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#define INCLUDE_IEEE754_H
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#include <features.h>
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#include <endian.h>
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/* glibc compatibility */
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#if !defined(FLOAT_WORD_ORDER) && defined(__FLOAT_WORD_ORDER)
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#define FLOAT_WORD_ORDER __FLOAT_WORD_ORDER
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#endif
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#if FLOAT_WORD_ORDER != BYTE_ORDER || \
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!(BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == BIG_ENDIAN)
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#error "Please add support for the endianness on your platform"
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#endif
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__BEGIN_DECLS
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#define SNG_EXPBITS 8
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#define SNG_FRACBITS 23
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#define SNG_EXP_INFNAN 255
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#define SNG_EXP_BIAS 127
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#define IEEE754_FLOAT_BIAS SNG_EXP_BIAS
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struct ieee754_float_single
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int mantissa: SNG_FRACBITS;
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unsigned int exponent: SNG_EXPBITS;
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unsigned int negative: 1;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int negative: 1;
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unsigned int exponent: SNG_EXPBITS;
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unsigned int mantissa: SNG_FRACBITS;
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#endif
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};
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struct ieee754_float_single_nan
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int mantissa: SNG_FRACBITS-1;
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unsigned int quiet_nan: 1;
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unsigned int exponent: SNG_EXPBITS;
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unsigned int negative: 1;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int negative: 1;
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unsigned int exponent: SNG_EXPBITS;
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unsigned int quiet_nan: 1;
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unsigned int mantissa: SNG_FRACBITS-1;
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#endif
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};
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union ieee754_float
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{
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float f;
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struct ieee754_float_single ieee;
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struct ieee754_float_single_nan ieee_nan;
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};
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#define DBL_EXPBITS 11
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#define DBL_FRACHBITS 20
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#define DBL_FRACLBITS 32
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#define DBL_FRACBITS (DBL_FRACHBITS + DBL_FRACLBITS)
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#define DBL_EXP_INFNAN 2047
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#define DBL_EXP_BIAS 1023
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#define IEEE754_DOUBLE_BIAS DBL_EXP_BIAS
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struct ieee754_float_double
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int mantissa1: DBL_FRACLBITS;
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unsigned int mantissa0: DBL_FRACHBITS;
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unsigned int exponent: DBL_EXPBITS;
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unsigned int negative: 1;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int negative: 1;
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unsigned int exponent: DBL_EXPBITS;
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unsigned int mantissa0: DBL_FRACHBITS;
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unsigned int mantissa1: DBL_FRACLBITS;
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#endif
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};
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struct ieee754_float_double_nan
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int mantissa1: DBL_FRACLBITS;
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unsigned int mantissa0: DBL_FRACHBITS-1;
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unsigned int quiet_nan: 1;
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unsigned int exponent: DBL_EXPBITS;
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unsigned int negative: 1;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int negative: 1;
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unsigned int exponent: DBL_EXPBITS;
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unsigned int quiet_nan: 1;
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unsigned int mantissa0: DBL_FRACHBITS-1;
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unsigned int mantissa1: DBL_FRACLBITS;
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#endif
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};
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union ieee754_double
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{
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double d;
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struct ieee754_float_double ieee;
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struct ieee754_float_double_nan ieee_nan;
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};
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#define EXT_EXPBITS 15
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#define EXT_FRACHBITS 32
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#define EXT_FRACLBITS 32
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#define EXT_FRACBITS (EXT_FRACHBITS + EXT_FRACLBITS)
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#define EXT_EXP_INFNAN 32767
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#define EXT_EXP_INF 32767
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#define EXT_EXP_NAN 32767
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#define EXT_EXP_BIAS 16383
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#define IEEE854_LONG_DOUBLE_BIAS EXT_EXP_BIAS
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struct ieee754_float_long_double
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int mantissa1: EXT_FRACLBITS;
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unsigned int mantissa0: EXT_FRACHBITS;
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unsigned int exponent: EXT_EXPBITS;
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unsigned int negative: 1;
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unsigned int empty: 16;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int empty: 16;
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unsigned int negative: 1;
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unsigned int exponent: EXT_EXPBITS;
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unsigned int mantissa0: EXT_FRACHBITS;
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unsigned int mantissa1: EXT_FRACLBITS;
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#endif
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};
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struct ieee754_float_long_double_nan
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned int mantissa1: EXT_FRACLBITS;
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unsigned int mantissa0: EXT_FRACHBITS-2;
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unsigned int quiet_nan: 1;
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unsigned int one: 1;
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unsigned int exponent: EXT_EXPBITS;
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unsigned int negative: 1;
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unsigned int empty: 16;
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned int empty: 16;
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unsigned int negative: 1;
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unsigned int exponent: EXT_EXPBITS;
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unsigned int one: 1;
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unsigned int quiet_nan: 1;
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unsigned int mantissa0: EXT_FRACHBITS-2;
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unsigned int mantissa1: EXT_FRACLBITS;
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#endif
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};
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union ieee754_long_double
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{
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long double d;
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struct ieee754_float_long_double ieee;
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struct ieee754_float_long_double_nan ieee_nan;
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};
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__END_DECLS
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#endif
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