Annotation of sys/lib/libkern/quad.h, Revision 1.1.1.1
1.1 nbrk 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 1.9 2004/11/28 07:23:41 mickey 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: #if !defined(_KERNEL) && !defined(_STANDALONE)
54: #include <limits.h>
55: #else
56: #include <sys/limits.h>
57: #endif
58:
59: /*
60: * Depending on the desired operation, we view a `long long' (aka quad_t) in
61: * one or more of the following formats.
62: */
63: union uu {
64: quad_t q; /* as a (signed) quad */
65: u_quad_t uq; /* as an unsigned quad */
66: int sl[2]; /* as two signed ints */
67: u_int ul[2]; /* as two unsigned ints */
68: };
69:
70: /*
71: * Define high and low parts of a quad_t.
72: */
73: #define H _QUAD_HIGHWORD
74: #define L _QUAD_LOWWORD
75:
76: /*
77: * Total number of bits in a quad_t and in the pieces that make it up.
78: * These are used for shifting, and also below for halfword extraction
79: * and assembly.
80: */
81: #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
82: #define INT_BITS (sizeof(int) * CHAR_BIT)
83: #define HALF_BITS (sizeof(int) * CHAR_BIT / 2)
84:
85: /*
86: * Extract high and low shortwords from longword, and move low shortword of
87: * longword to upper half of long, i.e., produce the upper longword of
88: * ((quad_t)(x) << (number_of_bits_in_int/2)). (`x' must actually be u_int.)
89: *
90: * These are used in the multiply code, to split a longword into upper
91: * and lower halves, and to reassemble a product as a quad_t, shifted left
92: * (sizeof(int)*CHAR_BIT/2).
93: */
94: #define HHALF(x) ((u_int)(x) >> HALF_BITS)
95: #define LHALF(x) ((u_int)(x) & (((int)1 << HALF_BITS) - 1))
96: #define LHUP(x) ((u_int)(x) << HALF_BITS)
97:
98: /*
99: * XXX
100: * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
101: * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
102: * both compilers.
103: */
104: #if __GNUC_PREREQ__(2, 0) || defined(lint)
105: typedef unsigned int qshift_t;
106: #else
107: typedef u_quad_t qshift_t;
108: #endif
109:
110: quad_t __adddi3(quad_t, quad_t);
111: quad_t __anddi3(quad_t, quad_t);
112: quad_t __ashldi3(quad_t, qshift_t);
113: quad_t __ashrdi3(quad_t, qshift_t);
114: int __cmpdi2(quad_t, quad_t);
115: quad_t __divdi3(quad_t, quad_t);
116: quad_t __fixdfdi(double);
117: quad_t __fixsfdi(float);
118: u_quad_t __fixunsdfdi(double);
119: u_quad_t __fixunssfdi(float);
120: double __floatdidf(quad_t);
121: float __floatdisf(quad_t);
122: double __floatunsdidf(u_quad_t);
123: quad_t __iordi3(quad_t, quad_t);
124: quad_t __lshldi3(quad_t, qshift_t);
125: quad_t __lshrdi3(quad_t, qshift_t);
126: quad_t __moddi3(quad_t, quad_t);
127: quad_t __muldi3(quad_t, quad_t);
128: quad_t __negdi2(quad_t);
129: quad_t __one_cmpldi2(quad_t);
130: u_quad_t __qdivrem(u_quad_t, u_quad_t, u_quad_t *);
131: quad_t __subdi3(quad_t, quad_t);
132: int __ucmpdi2(u_quad_t, u_quad_t);
133: u_quad_t __udivdi3(u_quad_t, u_quad_t );
134: u_quad_t __umoddi3(u_quad_t, u_quad_t );
135: quad_t __xordi3(quad_t, quad_t);
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