Home | History | Annotate | Line # | Download | only in include
ieee.h revision 1.10.68.1
      1  1.10.68.1  uebayasi /*	$NetBSD: ieee.h,v 1.10.68.1 2010/10/22 07:21:19 uebayasi Exp $	*/
      2        1.1  fredette 
      3        1.1  fredette /*	$OpenBSD: ieee.h,v 1.1 1999/04/20 19:44:04 mickey Exp $	*/
      4        1.1  fredette 
      5        1.1  fredette /*
      6        1.1  fredette  * Copyright (c) 1992, 1993
      7        1.1  fredette  *	The Regents of the University of California.  All rights reserved.
      8        1.1  fredette  *
      9        1.1  fredette  * This software was developed by the Computer Systems Engineering group
     10        1.1  fredette  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     11        1.1  fredette  * contributed to Berkeley.
     12        1.1  fredette  *
     13        1.1  fredette  * All advertising materials mentioning features or use of this software
     14        1.1  fredette  * must display the following acknowledgement:
     15        1.1  fredette  *	This product includes software developed by the University of
     16        1.1  fredette  *	California, Lawrence Berkeley Laboratory.
     17        1.1  fredette  *
     18        1.1  fredette  * Redistribution and use in source and binary forms, with or without
     19        1.1  fredette  * modification, are permitted provided that the following conditions
     20        1.1  fredette  * are met:
     21        1.1  fredette  * 1. Redistributions of source code must retain the above copyright
     22        1.1  fredette  *    notice, this list of conditions and the following disclaimer.
     23        1.1  fredette  * 2. Redistributions in binary form must reproduce the above copyright
     24        1.1  fredette  *    notice, this list of conditions and the following disclaimer in the
     25        1.1  fredette  *    documentation and/or other materials provided with the distribution.
     26        1.2       agc  * 3. Neither the name of the University nor the names of its contributors
     27        1.1  fredette  *    may be used to endorse or promote products derived from this software
     28        1.1  fredette  *    without specific prior written permission.
     29        1.1  fredette  *
     30        1.1  fredette  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31        1.1  fredette  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32        1.1  fredette  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33        1.1  fredette  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34        1.1  fredette  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35        1.1  fredette  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36        1.1  fredette  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37        1.1  fredette  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38        1.1  fredette  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39        1.1  fredette  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40        1.1  fredette  * SUCH DAMAGE.
     41        1.1  fredette  *
     42        1.1  fredette  *	@(#)ieee.h	8.1 (Berkeley) 6/11/93
     43        1.1  fredette  */
     44        1.1  fredette 
     45        1.1  fredette /*
     46        1.1  fredette  * ieee.h defines the machine-dependent layout of the machine's IEEE
     47        1.1  fredette  * floating point.  It does *not* define (yet?) any of the rounding
     48        1.1  fredette  * mode bits, exceptions, and so forth.
     49        1.1  fredette  */
     50        1.1  fredette 
     51        1.4    kleink #include <sys/ieee754.h>
     52        1.1  fredette 
     53        1.7    kleink #ifdef _LP64
     54        1.1  fredette #define	EXT_EXPBITS	15
     55       1.10  christos #define EXT_FRACHBITS	16
     56       1.10  christos #define	EXT_FRACHMBITS	32
     57       1.10  christos #define	EXT_FRACLMBITS	32
     58       1.10  christos #define	EXT_FRACLBITS	32
     59       1.10  christos #define	EXT_FRACBITS	(EXT_FRACLBITS + EXT_FRACLMBITS + EXT_FRACHMBITS + EXT_FRACHBITS)
     60       1.10  christos 
     61       1.10  christos #define	EXT_TO_ARRAY32(u, a) do {			\
     62       1.10  christos 	(a)[0] = (uint32_t)(u).extu_ext.ext_fracl;	\
     63       1.10  christos 	(a)[1] = (uint32_t)(u).extu_ext.ext_fraclm;	\
     64       1.10  christos 	(a)[2] = (uint32_t)(u).extu_ext.ext_frachm;	\
     65       1.10  christos 	(a)[3] = (uint32_t)(u).extu_ext.ext_frach;	\
     66       1.10  christos } while(/*CONSTCOND*/0)
     67        1.1  fredette 
     68        1.1  fredette struct ieee_ext {
     69        1.1  fredette 	u_int	ext_sign:1;
     70       1.10  christos 	u_int	ext_exp:EXT_EXPBITS;
     71       1.10  christos 	u_int	ext_frach:EXT_FRACHBITS;
     72        1.1  fredette 	u_int	ext_frachm;
     73        1.1  fredette 	u_int	ext_fraclm;
     74        1.1  fredette 	u_int	ext_fracl;
     75        1.1  fredette };
     76        1.1  fredette 
     77        1.1  fredette /*
     78        1.1  fredette  * Floats whose exponent is in [1..INFNAN) (of whatever type) are
     79        1.1  fredette  * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
     80        1.1  fredette  * Floats whose exponent is zero are either zero (iff all fraction
     81        1.1  fredette  * bits are zero) or subnormal values.
     82        1.1  fredette  *
     83        1.8    kleink  * A NaN is a `signalling NaN' if its QUIETNAN bit is set in its
     84        1.8    kleink  * high fraction; if the bit is clear, it is a `quiet NaN'.
     85        1.1  fredette  */
     86  1.10.68.1  uebayasi #define	EXT_EXP_INFNAN	0x7fff
     87  1.10.68.1  uebayasi #define	EXT_EXP_INF	0x7fff
     88  1.10.68.1  uebayasi #define	EXT_EXP_NAN	0x7fff
     89        1.1  fredette 
     90        1.1  fredette #if 0
     91        1.8    kleink #define	SNG_QUIETNAN	(1 << 22)
     92        1.8    kleink #define	DBL_QUIETNAN	(1 << 19)
     93        1.1  fredette #define	EXT_QUIETNAN	(1 << 15)
     94        1.1  fredette #endif
     95        1.1  fredette 
     96        1.1  fredette /*
     97        1.1  fredette  * Exponent biases.
     98        1.1  fredette  */
     99        1.1  fredette #define	EXT_EXP_BIAS	16383
    100        1.5    kleink 
    101        1.5    kleink /*
    102        1.5    kleink  * Convenience data structures.
    103        1.5    kleink  */
    104        1.5    kleink union ieee_ext_u {
    105        1.5    kleink 	long double		extu_ld;
    106        1.6    kleink 	struct ieee_ext		extu_ext;
    107        1.5    kleink };
    108  1.10.68.1  uebayasi 
    109  1.10.68.1  uebayasi #define extu_exp	extu_ext.ext_exp
    110  1.10.68.1  uebayasi #define extu_sign	extu_ext.ext_sign
    111  1.10.68.1  uebayasi #define extu_fracl	extu_ext.ext_fracl
    112  1.10.68.1  uebayasi #define extu_frach	extu_ext.ext_frach
    113  1.10.68.1  uebayasi 
    114  1.10.68.1  uebayasi #define LDBL_NBIT	0x80000000
    115  1.10.68.1  uebayasi #define mask_nbit_l(u)	((u).extu_frach &= ~LDBL_NBIT)
    116  1.10.68.1  uebayasi 
    117        1.7    kleink #endif /* _LP64 */
    118