ieee.h revision 1.12 
1/*	$NetBSD: ieee.h,v 1.12 2007/02/04 00:39:43 christos 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/*
52 * The SPARC architecture defines the following IEEE 754 compliant
53 * 128-bit extended-precision format, which is supported only by the
54 * v9 toolchain.
55 */
56
57#if defined(__arch64__) || defined(_KERNEL)
58
59#define	EXT_EXPBITS	15
60#define EXT_FRACHBITS	16
61#define	EXT_FRACHMBITS	32
62#define	EXT_FRACLMBITS	32
63#define	EXT_FRACLBITS	32
64#define	EXT_FRACBITS	(EXT_FRACLBITS + EXT_FRACLMBITS + EXT_FRACHMBITS + EXT_FRACHBITS)
65
66#define	EXT_TO_ARRAY32(u, a) do {			\
67	(a)[0] = (uint32_t)(u).extu_ext.ext_fracl;	\
68	(a)[1] = (uint32_t)(u).extu_ext.ext_fraclm;	\
69	(a)[2] = (uint32_t)(u).extu_ext.ext_frachm;	\
70	(a)[3] = (uint32_t)(u).extu_ext.ext_frach;	\
71} while(/*CONSTCOND*/0)
72
73struct ieee_ext {
74	u_int	ext_sign:1;
75	u_int	ext_exp:EXT_EXPBITS;
76	u_int	ext_frach:EXT_FRACHBITS;
77	u_int	ext_frachm;
78	u_int	ext_fraclm;
79	u_int	ext_fracl;
80};
81
82/*
83 * Floats whose exponent is in [1..INFNAN) (of whatever type) are
84 * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
85 * Floats whose exponent is zero are either zero (iff all fraction
86 * bits are zero) or subnormal values.
87 *
88 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
89 * high fraction; if the bit is set, it is a `quiet NaN'.
90 */
91#define	EXT_EXP_INFNAN	32767
92
93#if 0
94#define	SNG_QUIETNAN	(1 << 22)
95#define	DBL_QUIETNAN	(1 << 19)
96#define	EXT_QUIETNAN	(1 << 15)
97#endif
98
99/*
100 * Exponent biases.
101 */
102#define	EXT_EXP_BIAS	16383
103
104/*
105 * Convenience data structures.
106 */
107union ieee_ext_u {
108	long double		extu_ld;
109	struct ieee_ext		extu_ext;
110};
111#endif /* __arch64__ || _KERNEL */
112