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ieee.h revision 1.6 
      1 /*	$NetBSD: ieee.h,v 1.6 2003/10/26 20:55:30 kleink 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 #ifndef __mc68010__
     52 #define	EXT_EXPBITS	15
     53 #define	EXT_FRACBITS	64
     54 
     55 struct ieee_ext {
     56 	u_int	ext_sign:1;
     57 	u_int	ext_exp:15;
     58 	u_int	ext_zero:16;
     59 	u_int	ext_int:1;
     60 	u_int	ext_frach:31;
     61 	u_int	ext_fracl;
     62 };
     63 
     64 /*
     65  * Extended floats whose exponent is in [0..INFNAN) and have their
     66  * explicit integer bit (the most significant bit of the fraction)
     67  * set are `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
     68  * Floats whose exponent is zero are either zero (iff all fraction
     69  * bits are zero) or subnormal values.
     70  *
     71  * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
     72  * high fraction; if the bit is set, it is a `quiet NaN'.
     73  */
     74 #define	EXT_EXP_INFNAN	32767
     75 
     76 #if 0
     77 #define	EXT_QUIETNAN	(1 << 15)
     78 #endif
     79 
     80 /*
     81  * Exponent biases.
     82  */
     83 #define	EXT_EXP_BIAS	16383
     84 
     85 #endif /* !__mc68010__ */
     86