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ieee.h revision 1.10 
      1 /*	$NetBSD: ieee.h,v 1.10 2007/02/04 00:39:19 christos Exp $	*/
      2 
      3 /*	$OpenBSD: ieee.h,v 1.1 1999/04/20 19:44:04 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1992, 1993
      7  *	The Regents of the University of California.  All rights reserved.
      8  *
      9  * This software was developed by the Computer Systems Engineering group
     10  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     11  * contributed to Berkeley.
     12  *
     13  * All advertising materials mentioning features or use of this software
     14  * must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Lawrence Berkeley Laboratory.
     17  *
     18  * Redistribution and use in source and binary forms, with or without
     19  * modification, are permitted provided that the following conditions
     20  * are met:
     21  * 1. Redistributions of source code must retain the above copyright
     22  *    notice, this list of conditions and the following disclaimer.
     23  * 2. Redistributions in binary form must reproduce the above copyright
     24  *    notice, this list of conditions and the following disclaimer in the
     25  *    documentation and/or other materials provided with the distribution.
     26  * 3. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	@(#)ieee.h	8.1 (Berkeley) 6/11/93
     43  */
     44 
     45 /*
     46  * ieee.h defines the machine-dependent layout of the machine's IEEE
     47  * floating point.  It does *not* define (yet?) any of the rounding
     48  * mode bits, exceptions, and so forth.
     49  */
     50 
     51 #include <sys/ieee754.h>
     52 
     53 #ifdef _LP64
     54 #define	EXT_EXPBITS	15
     55 #define EXT_FRACHBITS	16
     56 #define	EXT_FRACHMBITS	32
     57 #define	EXT_FRACLMBITS	32
     58 #define	EXT_FRACLBITS	32
     59 #define	EXT_FRACBITS	(EXT_FRACLBITS + EXT_FRACLMBITS + EXT_FRACHMBITS + EXT_FRACHBITS)
     60 
     61 #define	EXT_TO_ARRAY32(u, a) do {			\
     62 	(a)[0] = (uint32_t)(u).extu_ext.ext_fracl;	\
     63 	(a)[1] = (uint32_t)(u).extu_ext.ext_fraclm;	\
     64 	(a)[2] = (uint32_t)(u).extu_ext.ext_frachm;	\
     65 	(a)[3] = (uint32_t)(u).extu_ext.ext_frach;	\
     66 } while(/*CONSTCOND*/0)
     67 
     68 struct ieee_ext {
     69 	u_int	ext_sign:1;
     70 	u_int	ext_exp:EXT_EXPBITS;
     71 	u_int	ext_frach:EXT_FRACHBITS;
     72 	u_int	ext_frachm;
     73 	u_int	ext_fraclm;
     74 	u_int	ext_fracl;
     75 };
     76 
     77 /*
     78  * Floats whose exponent is in [1..INFNAN) (of whatever type) are
     79  * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
     80  * Floats whose exponent is zero are either zero (iff all fraction
     81  * bits are zero) or subnormal values.
     82  *
     83  * A NaN is a `signalling NaN' if its QUIETNAN bit is set in its
     84  * high fraction; if the bit is clear, it is a `quiet NaN'.
     85  */
     86 #define	EXT_EXP_INFNAN	32767
     87 
     88 #if 0
     89 #define	SNG_QUIETNAN	(1 << 22)
     90 #define	DBL_QUIETNAN	(1 << 19)
     91 #define	EXT_QUIETNAN	(1 << 15)
     92 #endif
     93 
     94 /*
     95  * Exponent biases.
     96  */
     97 #define	EXT_EXP_BIAS	16383
     98 
     99 /*
    100  * Convenience data structures.
    101  */
    102 union ieee_ext_u {
    103 	long double		extu_ld;
    104 	struct ieee_ext		extu_ext;
    105 };
    106 #endif /* _LP64 */
    107