quad.h revision 1.12 
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 *	$OpenBSD: quad.h,v 1.12 2014/06/10 04:16:57 deraadt Exp $
34 */
35
36/*
37 * Quad arithmetic.
38 *
39 * This library makes the following assumptions:
40 *
41 *  - The type long long (aka quad_t) exists.
42 *
43 *  - A quad variable is exactly twice as long as `int'.
44 *
45 *  - The machine's arithmetic is two's complement.
46 *
47 * This library can provide 128-bit arithmetic on a machine with 128-bit
48 * quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
49 * with 48-bit ints.
50 */
51
52#include <sys/types.h>
53#include <sys/limits.h>
54
55/*
56 * Depending on the desired operation, we view a `long long' (aka quad_t) in
57 * one or more of the following formats.
58 */
59union uu {
60	quad_t	q;		/* as a (signed) quad */
61	u_quad_t uq;		/* as an unsigned quad */
62	int	sl[2];		/* as two signed ints */
63	u_int	ul[2];		/* as two unsigned ints */
64};
65
66/*
67 * Define high and low parts of a quad_t.
68 */
69#define	H		_QUAD_HIGHWORD
70#define	L		_QUAD_LOWWORD
71
72/*
73 * Total number of bits in a quad_t and in the pieces that make it up.
74 * These are used for shifting, and also below for halfword extraction
75 * and assembly.
76 */
77#define	QUAD_BITS	(sizeof(quad_t) * CHAR_BIT)
78#define	INT_BITS	(sizeof(int) * CHAR_BIT)
79#define	HALF_BITS	(sizeof(int) * CHAR_BIT / 2)
80
81/*
82 * Extract high and low shortwords from longword, and move low shortword of
83 * longword to upper half of long, i.e., produce the upper longword of
84 * ((quad_t)(x) << (number_of_bits_in_int/2)).  (`x' must actually be u_int.)
85 *
86 * These are used in the multiply code, to split a longword into upper
87 * and lower halves, and to reassemble a product as a quad_t, shifted left
88 * (sizeof(int)*CHAR_BIT/2).
89 */
90#define	HHALF(x)	((u_int)(x) >> HALF_BITS)
91#define	LHALF(x)	((u_int)(x) & (((int)1 << HALF_BITS) - 1))
92#define	LHUP(x)		((u_int)(x) << HALF_BITS)
93
94typedef unsigned int	qshift_t;
95
96quad_t __adddi3(quad_t, quad_t);
97quad_t __anddi3(quad_t, quad_t);
98quad_t __ashldi3(quad_t, qshift_t);
99quad_t __ashrdi3(quad_t, qshift_t);
100int __cmpdi2(quad_t, quad_t);
101quad_t __divdi3(quad_t, quad_t);
102quad_t __fixdfdi(double);
103quad_t __fixsfdi(float);
104u_quad_t __fixunsdfdi(double);
105u_quad_t __fixunssfdi(float);
106double __floatdidf(quad_t);
107float __floatdisf(quad_t);
108double __floatunsdidf(u_quad_t);
109quad_t __iordi3(quad_t, quad_t);
110quad_t __lshldi3(quad_t, qshift_t);
111quad_t __lshrdi3(quad_t, qshift_t);
112quad_t __moddi3(quad_t, quad_t);
113quad_t __muldi3(quad_t, quad_t);
114quad_t __negdi2(quad_t);
115quad_t __one_cmpldi2(quad_t);
116u_quad_t __qdivrem(u_quad_t, u_quad_t, u_quad_t *);
117quad_t __subdi3(quad_t, quad_t);
118int __ucmpdi2(u_quad_t, u_quad_t);
119u_quad_t __udivdi3(u_quad_t, u_quad_t );
120u_quad_t __umoddi3(u_quad_t, u_quad_t );
121quad_t __xordi3(quad_t, quad_t);
122