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ieee.h revision 1.15 
      1 /*	$NetBSD: ieee.h,v 1.15 2007/02/22 17:11:15 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 */
    105