| 1 | /* $NetBSD: quad.h,v 1.17 2005/12/11 12:24:37 christos Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1992, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This software was developed by the Computer Systems Engineering group
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| 8 | * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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| 9 | * contributed to Berkeley.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. Neither the name of the University nor the names of its contributors
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| 20 | * may be used to endorse or promote products derived from this software
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| 21 | * without specific prior written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 33 | * SUCH DAMAGE.
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| 34 | *
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| 35 | * @(#)quad.h 8.1 (Berkeley) 6/4/93
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| 36 | */
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| 37 |
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| 38 | /*
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| 39 | * Quad arithmetic.
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| 40 | *
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| 41 | * This library makes the following assumptions:
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| 42 | *
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| 43 | * - The type long long (aka quad_t) exists.
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| 44 | *
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| 45 | * - A quad variable is exactly twice as long as `int'.
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| 46 | *
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| 47 | * - The machine's arithmetic is two's complement.
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| 48 | *
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| 49 | * This library can provide 128-bit arithmetic on a machine with 128-bit
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| 50 | * quads and 64-bit ints, for instance, or 96-bit arithmetic on machines
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| 51 | * with 48-bit ints.
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| 52 | */
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| 53 |
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| 54 | #if 0 /* iprt */
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| 55 | #include <sys/types.h>
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| 56 | #if !defined(_KERNEL) && !defined(_STANDALONE)
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| 57 | #include <limits.h>
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| 58 | #else
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| 59 | #include <machine/limits.h>
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| 60 | #endif
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| 61 | #else /* iprt */
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| 62 | # include <iprt/types.h>
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| 63 | # include <limits.h>
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| 64 | # undef __P
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| 65 | # define __P(a) a
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| 66 | # undef __GNUC_PREREQ__
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| 67 | # define __GNUC_PREREQ__(m1,m2) 1
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| 68 | # if 1 /* ASSUMES: little endian */
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| 69 | # define _QUAD_HIGHWORD 1
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| 70 | # define _QUAD_LOWWORD 0
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| 71 | # else
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| 72 | # define _QUAD_HIGHWORD 0
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| 73 | # define _QUAD_LOWWORD 1
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| 74 | # endif
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| 75 | typedef unsigned int u_int;
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| 76 | typedef int64_t quad_t;
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| 77 | typedef uint64_t u_quad_t;
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| 78 | typedef quad_t *qaddr_t;
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| 79 | #endif /* iprt */
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| 80 |
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| 81 | /*
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| 82 | * Depending on the desired operation, we view a `long long' (aka quad_t) in
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| 83 | * one or more of the following formats.
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| 84 | */
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| 85 | union uu {
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| 86 | quad_t q; /* as a (signed) quad */
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| 87 | u_quad_t uq; /* as an unsigned quad */
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| 88 | int sl[2]; /* as two signed ints */
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| 89 | u_int ul[2]; /* as two unsigned ints */
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| 90 | };
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| 91 |
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| 92 | /*
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| 93 | * Define high and low parts of a quad_t.
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| 94 | */
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| 95 | #define H _QUAD_HIGHWORD
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| 96 | #define L _QUAD_LOWWORD
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| 97 |
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| 98 | /*
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| 99 | * Total number of bits in a quad_t and in the pieces that make it up.
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| 100 | * These are used for shifting, and also below for halfword extraction
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| 101 | * and assembly.
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| 102 | */
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| 103 | #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
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| 104 | #define INT_BITS (sizeof(int) * CHAR_BIT)
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| 105 | #define HALF_BITS (sizeof(int) * CHAR_BIT / 2)
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| 106 |
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| 107 | /*
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| 108 | * Extract high and low shortwords from longword, and move low shortword of
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| 109 | * longword to upper half of long, i.e., produce the upper longword of
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| 110 | * ((quad_t)(x) << (number_of_bits_in_int/2)). (`x' must actually be u_int.)
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| 111 | *
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| 112 | * These are used in the multiply code, to split a longword into upper
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| 113 | * and lower halves, and to reassemble a product as a quad_t, shifted left
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| 114 | * (sizeof(int)*CHAR_BIT/2).
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| 115 | */
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| 116 | #define HHALF(x) ((u_int)(x) >> HALF_BITS)
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| 117 | #define LHALF(x) ((u_int)(x) & (((int)1 << HALF_BITS) - 1))
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| 118 | #define LHUP(x) ((u_int)(x) << HALF_BITS)
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| 119 |
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| 120 | /*
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| 121 | * XXX
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| 122 | * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
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| 123 | * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
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| 124 | * both compilers.
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| 125 | */
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| 126 | #if __GNUC_PREREQ__(2, 0) || defined(lint)
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| 127 | typedef unsigned int qshift_t;
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| 128 | #else
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| 129 | typedef u_quad_t qshift_t;
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| 130 | #endif
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| 131 |
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| 132 | __BEGIN_DECLS
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| 133 | quad_t __adddi3 __P((quad_t, quad_t));
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| 134 | quad_t __anddi3 __P((quad_t, quad_t));
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| 135 | quad_t __ashldi3 __P((quad_t, qshift_t));
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| 136 | quad_t __ashrdi3 __P((quad_t, qshift_t));
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| 137 | int __cmpdi2 __P((quad_t, quad_t ));
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| 138 | quad_t __divdi3 __P((quad_t, quad_t));
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| 139 | quad_t __fixdfdi __P((double));
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| 140 | quad_t __fixsfdi __P((float));
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| 141 | u_quad_t __fixunsdfdi __P((double));
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| 142 | u_quad_t __fixunssfdi __P((float));
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| 143 | double __floatdidf __P((quad_t));
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| 144 | float __floatdisf __P((quad_t));
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| 145 | double __floatunsdidf __P((u_quad_t));
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| 146 | quad_t __iordi3 __P((quad_t, quad_t));
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| 147 | quad_t __lshldi3 __P((quad_t, qshift_t));
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| 148 | quad_t __lshrdi3 __P((quad_t, qshift_t));
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| 149 | quad_t __moddi3 __P((quad_t, quad_t));
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| 150 | quad_t __muldi3 __P((quad_t, quad_t));
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| 151 | quad_t __negdi2 __P((quad_t));
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| 152 | quad_t __one_cmpldi2 __P((quad_t));
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| 153 | u_quad_t __qdivrem __P((u_quad_t, u_quad_t, u_quad_t *));
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| 154 | quad_t __subdi3 __P((quad_t, quad_t));
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| 155 | int __ucmpdi2 __P((u_quad_t, u_quad_t));
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| 156 | u_quad_t __udivdi3 __P((u_quad_t, u_quad_t ));
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| 157 | u_quad_t __umoddi3 __P((u_quad_t, u_quad_t ));
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| 158 | quad_t __xordi3 __P((quad_t, quad_t));
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| 159 | __END_DECLS
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