lib/libc/include/fpmath.h

   1 /*-
   2  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
   3  * Copyright (c) 2002 David Schultz <das@FreeBSD.ORG>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/lib/libc/include/fpmath.h,v 1.4 2008/12/23 22:20:59 marcel Exp $
  28  */
  29
  30 #include <sys/endian.h>
  31 #include "_fpmath.h"
  32
  33 #ifndef _IEEE_WORD_ORDER
  34 #define _IEEE_WORD_ORDER        _BYTE_ORDER
  35 #endif
  36
  37 union IEEEf2bits {
  38         float   f;
  39         struct {
  40 #if _BYTE_ORDER == _LITTLE_ENDIAN
  41                 unsigned int    man     :23;
  42                 unsigned int    exp     :8;
  43                 unsigned int    sign    :1;
  44 #else /* _BIG_ENDIAN */
  45                 unsigned int    sign    :1;
  46                 unsigned int    exp     :8;
  47                 unsigned int    man     :23;
  48 #endif
  49         } bits;
  50 };
  51
  52 #define DBL_MANH_SIZE   20
  53 #define DBL_MANL_SIZE   32
  54
  55 union IEEEd2bits {
  56         double  d;
  57         struct {
  58 #if _BYTE_ORDER == _LITTLE_ENDIAN
  59 #if _IEEE_WORD_ORDER == _LITTLE_ENDIAN
  60                 unsigned int    manl    :32;
  61 #endif
  62                 unsigned int    manh    :20;
  63                 unsigned int    exp     :11;
  64                 unsigned int    sign    :1;
  65 #if _IEEE_WORD_ORDER == _BIG_ENDIAN
  66                 unsigned int    manl    :32;
  67 #endif
  68 #else /* _BIG_ENDIAN */
  69                 unsigned int    sign    :1;
  70                 unsigned int    exp     :11;
  71                 unsigned int    manh    :20;
  72                 unsigned int    manl    :32;
  73 #endif
  74         } bits;
  75 };