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https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
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78f622e84a
Instead of using all sorts of operating system specific constructs, we can just query the compiler which byte order is being used. This has the advantage that the code builds on new platforms without any tweaks.
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*-
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* Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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* Copyright (c) 2002 David Schultz <das@FreeBSD.ORG>
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/lib/libc/include/fpmath.h,v 1.4 2008/12/23 22:20:59 marcel Exp $
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*/
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#ifndef _FPMATH_H_
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#define _FPMATH_H_
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// Currently assumes Intel platform
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#if defined (__i386__) || defined(__x86_64__)
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#ifdef __LP64__
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#include "amd64_fpmath.h"
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#else
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#include "i386_fpmath.h"
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#endif
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#endif
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#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__)
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/* Definitions provided directly by GCC and Clang. */
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#define _LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
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#define _BIG_ENDIAN __ORDER_BIG_ENDIAN__
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#define _PDP_ENDIAN __ORDER_PDP_ENDIAN__
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#define _BYTE_ORDER __BYTE_ORDER__
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#elif defined(__linux)
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#include <features.h>
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#include <endian.h>
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#define _LITTLE_ENDIAN __LITTLE_ENDIAN
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#define _BIG_ENDIAN __BIG_ENDIAN
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#define _PDP_ENDIAN __PDP_ENDIAN
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#define _BYTE_ORDER __BYTE_ORDER
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#elif defined(__APPLE__)
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#include <machine/endian.h>
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#define _LITTLE_ENDIAN LITTLE_ENDIAN
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#define _BIG_ENDIAN BIG_ENDIAN
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#define _PDP_ENDIAN PDP_ENDIAN
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#define _BYTE_ORDER BYTE_ORDER
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#elif defined(__FreeBSD__)
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#include <machine/endian.h>
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#elif defined(_WIN32)
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#define _LITTLE_ENDIAN 1234
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#define _BIG_ENDIAN 4321
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#define _PDP_ENDIAN 3412
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#define _BYTE_ORDER _LITTLE_ENDIAN
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#define _FLOAT_WORD_ORDER _LITTLE_ENDIAN
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#define LITTLE_ENDIAN _LITTLE_ENDIAN
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#define BIG_ENDIAN _BIG_ENDIAN
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#define PDP_ENDIAN _PDP_ENDIAN
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#define BYTE_ORDER _BYTE_ORDER
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#endif
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#ifndef _IEEE_WORD_ORDER
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#define _IEEE_WORD_ORDER _BYTE_ORDER
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#endif
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union IEEEf2bits {
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float f;
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struct {
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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unsigned int man :23;
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unsigned int exp :8;
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unsigned int sign :1;
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#else /* _BIG_ENDIAN */
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unsigned int sign :1;
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unsigned int exp :8;
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unsigned int man :23;
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#endif
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} bits;
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};
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#define DBL_MANH_SIZE 20
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#define DBL_MANL_SIZE 32
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union IEEEd2bits {
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double d;
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struct {
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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#if _IEEE_WORD_ORDER == _LITTLE_ENDIAN
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unsigned int manl :32;
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#endif
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unsigned int manh :20;
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unsigned int exp :11;
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unsigned int sign :1;
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#if _IEEE_WORD_ORDER == _BIG_ENDIAN
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unsigned int manl :32;
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#endif
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#else /* _BIG_ENDIAN */
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unsigned int sign :1;
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unsigned int exp :11;
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unsigned int manh :20;
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unsigned int manl :32;
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#endif
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} bits;
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};
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#endif
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