xref: /dragonfly/stand/lib/quad.h (revision 7d3e9a5b)
1 /*-
2  * Copyright (c) 1992, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * This software was developed by the Computer Systems Engineering group
6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7  * contributed to Berkeley.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  *	@(#)quad.h	8.1 (Berkeley) 6/4/93
34  * $FreeBSD: src/lib/libstand/quad.h,v 1.2 1999/08/28 00:05:33 peter Exp $
35  */
36 
37 #ifndef _STAND_QUAD_H_
38 #define	_STAND_QUAD_H_
39 
40 #include <sys/cdefs.h>
41 #include <sys/types.h>
42 #include <limits.h>
43 
44 _Static_assert(sizeof(quad_t) == sizeof(int) * 2,
45 	"Bitwise function in libstand are broken on this architecture");
46 
47 /*
48  * Depending on the desired operation, we view a `long long' (aka quad_t) in
49  * one or more of the following formats.
50  */
51 union uu {
52 	quad_t	q;		/* as a (signed) quad */
53 	quad_t	uq;		/* as an unsigned quad */
54 	int	sl[2];		/* as two signed ints */
55 	u_int	ul[2];		/* as two unsigned ints */
56 };
57 
58 #define	HALF_BITS	(sizeof(int) * CHAR_BIT / 2)
59 
60 #define	HHALF(x)	((x) >> HALF_BITS)
61 #define	LHALF(x)	((x) & ((1 << HALF_BITS) - 1))
62 
63 u_quad_t	__udivmoddi4 (u_quad_t, u_quad_t, u_quad_t *);
64 u_quad_t	__udivdi3 (u_quad_t, u_quad_t);
65 u_quad_t	__umoddi3 (u_quad_t, u_quad_t);
66 
67 #endif /* !_STAND_QUAD_H_ */
68