Use CSTD and remove local CSTD settings which are no longer needed.
[dragonfly.git] / lib / libstand / quad.h
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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. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)quad.h 8.1 (Berkeley) 6/4/93
38 * $FreeBSD: src/lib/libstand/quad.h,v 1.2 1999/08/28 00:05:33 peter Exp $
064e1fb3 39 * $DragonFly: src/lib/libstand/quad.h,v 1.3 2003/11/12 20:21:31 eirikn Exp $
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40 */
41
42/*
43 * Quad arithmetic.
44 *
45 * This library makes the following assumptions:
46 *
47 * - The type long long (aka quad_t) exists.
48 *
49 * - A quad variable is exactly twice as long as `long'.
50 *
51 * - The machine's arithmetic is two's complement.
52 *
53 * This library can provide 128-bit arithmetic on a machine with 128-bit
54 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
55 * with 48-bit longs.
56 */
57
58#include <sys/cdefs.h>
59#include <sys/types.h>
60#include <limits.h>
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 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) ((x) >> HALF_BITS)
98#define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
99#define LHUP(x) ((x) << HALF_BITS)
100
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101quad_t __divdi3 (quad_t a, quad_t b);
102quad_t __moddi3 (quad_t a, quad_t b);
103u_quad_t __qdivrem (u_quad_t u, u_quad_t v, u_quad_t *rem);
104u_quad_t __udivdi3 (u_quad_t a, u_quad_t b);
105u_quad_t __umoddi3 (u_quad_t a, u_quad_t b);
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106
107/*
108 * XXX
109 * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
110 * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
111 * both compilers.
112 */
113#if __GNUC__ >= 2
114typedef unsigned int qshift_t;
115#else
116typedef u_quad_t qshift_t;
117#endif