fpmath.h

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/*-
 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
 * Copyright (c) 2002 David Schultz <das@FreeBSD.ORG>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/lib/libc/include/fpmath.h,v 1.4 2008/12/23 22:20:59 marcel Exp $
 */
#ifndef _FPMATH_H_
#define _FPMATH_H_
 
#if defined(__aarch64__)
#include "aarch64_fpmath.h"
#elif defined(__i386__) || defined(__x86_64__) || defined(_M_X64 ) || defined(_M_IX86 )
#ifdef __LP64__
#include "amd64_fpmath.h"
#else
#include "i386_fpmath.h"
#endif
#elif defined(__powerpc__)
#include "powerpc_fpmath.h"
#elif defined(__mips__)
#include "mips_fpmath.h"
#elif defined(__s390__)
#include "s390_fpmath.h"
#elif defined(__riscv)
#include "riscv_fpmath.h"
#endif
 
/* Definitions provided directly by GCC and Clang. */
#if !(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__))
 
#if defined(__GLIBC__)
 
#include <features.h>
#include <endian.h>
#define __ORDER_LITTLE_ENDIAN__  __LITTLE_ENDIAN
#define __ORDER_BIG_ENDIAN__     __BIG_ENDIAN
#define __BYTE_ORDER__           __BYTE_ORDER
 
#elif defined(__APPLE__)
 
#include <machine/endian.h>
#define __ORDER_LITTLE_ENDIAN__  LITTLE_ENDIAN
#define __ORDER_BIG_ENDIAN__     BIG_ENDIAN
#define __BYTE_ORDER__           BYTE_ORDER
 
#elif defined(_WIN32)
 
#define __ORDER_LITTLE_ENDIAN__  1234
#define __ORDER_BIG_ENDIAN__     4321
#define __BYTE_ORDER__           __ORDER_LITTLE_ENDIAN__
 
#elif defined (__ICCARM__)
 
#define __ORDER_LITTLE_ENDIAN__  1234
#define __ORDER_BIG_ENDIAN__     4321
#if defined(__LITTLE_ENDIAN__)
#define __BYTE_ORDER__           __ORDER_LITTLE_ENDIAN__
#else
#define __BYTE_ORDER__           __ORDER_BIG_ENDIAN__
#endif
 
#else
 
#error no compatible compiler detected
 
#endif
 
#endif /* __BYTE_ORDER__, __ORDER_LITTLE_ENDIAN__ and __ORDER_BIG_ENDIAN__ */
 
#ifndef __FLOAT_WORD_ORDER__
#define __FLOAT_WORD_ORDER__     __BYTE_ORDER__
#endif
 
#if __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
#error "word order is ambiguous" __FLOAT_WORD_ORDER__
#endif
#endif
 
union IEEEf2bits {
    float   f;
    struct {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
        unsigned int    man :23;
        unsigned int    exp :8;
        unsigned int    sign    :1;
#else /* _BIG_ENDIAN */
        unsigned int    sign    :1;
        unsigned int    exp :8;
        unsigned int    man :23;
#endif
    } bits;
};
 
#define DBL_MANH_SIZE   20
#define DBL_MANL_SIZE   32
 
union IEEEd2bits {
    double  d;
    struct {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#if __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
        unsigned int    manl    :32;
#endif
        unsigned int    manh    :20;
        unsigned int    exp :11;
        unsigned int    sign    :1;
#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
        unsigned int    manl    :32;
#endif
#else /* _BIG_ENDIAN */
        unsigned int    sign    :1;
        unsigned int    exp :11;
        unsigned int    manh    :20;
        unsigned int    manl    :32;
#endif
    } bits;
};
 
#endif