sys/arch/m68k/include/ieee.h

   1 /*      $NetBSD: ieee.h,v 1.14 2007/02/22 17:09:40 mhitch Exp $ */
   2
   3 /*
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This software was developed by the Computer Systems Engineering group
   8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   9  * contributed to Berkeley.
  10  *
  11  * All advertising materials mentioning features or use of this software
  12  * must display the following acknowledgement:
  13  *      This product includes software developed by the University of
  14  *      California, Lawrence Berkeley Laboratory.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      @(#)ieee.h      8.1 (Berkeley) 6/11/93
  41  */
  42
  43 /*
  44  * ieee.h defines the machine-dependent layout of the machine's IEEE
  45  * floating point.  It does *not* define (yet?) any of the rounding
  46  * mode bits, exceptions, and so forth.
  47  */
  48
  49 #include <sys/ieee754.h>
  50
  51 #if !defined(__mc68010__) || defined(_KERNEL)
  52 #define EXT_EXPBITS     15
  53 #define EXT_FRACHBITS   32
  54 #define EXT_FRACLBITS   32
  55 #define EXT_FRACBITS    (EXT_FRACLBITS + EXT_FRACHBITS)
  56
  57 #define EXT_TO_ARRAY32(u, a) do {                       \
  58         (a)[0] = (uint32_t)(u).extu_ext.ext_fracl;      \
  59         (a)[1] = (uint32_t)(u).extu_ext.ext_frach;      \
  60 } while(/*CONSTCOND*/0)
  61
  62 struct ieee_ext {
  63         u_int   ext_sign:1;
  64         u_int   ext_exp:EXT_EXPBITS;
  65         u_int   ext_zero:16;
  66 #if 0
  67         u_int   ext_int:1;
  68 #endif
  69         u_int   ext_frach;
  70         u_int   ext_fracl;
  71 };
  72
  73 /*
  74  * Extended floats whose exponent is in [0..INFNAN) and have their
  75  * explicit integer bit (the most significant bit of the fraction)
  76  * set are `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
  77  * Floats whose exponent is zero are either zero (iff all fraction
  78  * bits are zero) or subnormal values.
  79  *
  80  * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
  81  * high fraction; if the bit is set, it is a `quiet NaN'.
  82  */
  83 #define EXT_EXP_INFNAN  32767
  84
  85 #if 0
  86 #define SNG_QUIETNAN    (1 << 22)
  87 #define DBL_QUIETNAN    (1 << 19)
  88 #define EXT_QUIETNAN    (1 << 30)
  89 #endif
  90
  91 /*
  92  * Exponent biases.
  93  */
  94 #define EXT_EXP_BIAS    16383
  95
  96 /*
  97  * Convenience data structures.
  98  */
  99 union ieee_ext_u {
 100         long double             extu_ld;
 101         struct ieee_ext         extu_ext;
 102 };
 103
 104 #endif /* !__mc68010__ || _KERNEL */