quad.h revision 1.8 
1/*	$OpenBSD: quad.h,v 1.8 2003/06/02 23:28:08 millert Exp $	*/
2/*	$NetBSD: quad.h,v 1.7 1996/04/18 02:20:04 cgd Exp $	*/
3
4/*-
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)quad.h	8.1 (Berkeley) 6/4/93
37 */
38
39/*
40 * Quad arithmetic.
41 *
42 * This library makes the following assumptions:
43 *
44 *  - The type long long (aka quad_t) exists.
45 *
46 *  - A quad variable is exactly twice as long as `long'.
47 *
48 *  - The machine's arithmetic is two's complement.
49 *
50 * This library can provide 128-bit arithmetic on a machine with 128-bit
51 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
52 * with 48-bit longs.
53 */
54
55#include <sys/types.h>
56#if !defined(_KERNEL) && !defined(_STANDALONE)
57#include <limits.h>
58#else
59#include <sys/limits.h>
60#endif
61
62/*
63 * Depending on the desired operation, we view a `long long' (aka quad_t) in
64 * one or more of the following formats.
65 */
66union uu {
67	quad_t	q;		/* as a (signed) quad */
68	u_quad_t uq;		/* as an unsigned quad */
69	long	sl[2];		/* as two signed longs */
70	u_long	ul[2];		/* as two unsigned longs */
71};
72
73/*
74 * Define high and low longwords.
75 */
76#define	H		_QUAD_HIGHWORD
77#define	L		_QUAD_LOWWORD
78
79/*
80 * Total number of bits in a quad_t and in the pieces that make it up.
81 * These are used for shifting, and also below for halfword extraction
82 * and assembly.
83 */
84#define	QUAD_BITS	(sizeof(quad_t) * CHAR_BIT)
85#define	LONG_BITS	(sizeof(long) * CHAR_BIT)
86#define	HALF_BITS	(sizeof(long) * CHAR_BIT / 2)
87
88/*
89 * Extract high and low shortwords from longword, and move low shortword of
90 * longword to upper half of long, i.e., produce the upper longword of
91 * ((quad_t)(x) << (number_of_bits_in_long/2)).  (`x' must actually be u_long.)
92 *
93 * These are used in the multiply code, to split a longword into upper
94 * and lower halves, and to reassemble a product as a quad_t, shifted left
95 * (sizeof(long)*CHAR_BIT/2).
96 */
97#define	HHALF(x)	((u_long)(x) >> HALF_BITS)
98#define	LHALF(x)	((u_long)(x) & (((long)1 << HALF_BITS) - 1))
99#define	LHUP(x)		((u_long)(x) << HALF_BITS)
100
101extern u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
102
103/*
104 * XXX
105 * Compensate for gcc 1 vs gcc 2.  Gcc 1 defines ?sh?di3's second argument
106 * as u_quad_t, while gcc 2 correctly uses int.  Unfortunately, we still use
107 * both compilers.
108 */
109#if __GNUC__ >= 2
110typedef unsigned int	qshift_t;
111#else
112typedef u_quad_t	qshift_t;
113#endif
114
115__BEGIN_DECLS
116quad_t	__adddi3(quad_t, quad_t);
117quad_t	__anddi3(quad_t, quad_t);
118quad_t	__ashldi3(quad_t, qshift_t);
119quad_t	__ashrdi3(quad_t, qshift_t);
120int	__cmpdi2(quad_t, quad_t);
121quad_t	__divdi3(quad_t, quad_t);
122quad_t	__iordi3(quad_t, quad_t);
123quad_t	__lshldi3(quad_t, qshift_t);
124quad_t	__lshrdi3(quad_t, qshift_t);
125quad_t	__moddi3(quad_t, quad_t);
126quad_t	__muldi3(quad_t, quad_t);
127quad_t	__negdi2(quad_t);
128quad_t	__one_cmpldi2(quad_t);
129quad_t	__subdi3(quad_t, quad_t);
130int	__ucmpdi2(u_quad_t, u_quad_t);
131u_quad_t __udivdi3(u_quad_t, u_quad_t);
132u_quad_t __umoddi3(u_quad_t, u_quad_t);
133quad_t	__xordi3(quad_t, quad_t);
134__END_DECLS
135