| 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/sys/libkern/quad.h,v 1.9 1999/08/28 00:46:36 peter Exp $␊ |
| 39 | */␊ |
| 40 | ␊ |
| 41 | /*␊ |
| 42 | * Quad arithmetic.␊ |
| 43 | *␊ |
| 44 | * This library makes the following assumptions:␊ |
| 45 | *␊ |
| 46 | * - The type long long (aka quad_t) exists.␊ |
| 47 | *␊ |
| 48 | * - A quad variable is exactly twice as long as `long'.␊ |
| 49 | *␊ |
| 50 | * - The machine's arithmetic is two's complement.␊ |
| 51 | *␊ |
| 52 | * This library can provide 128-bit arithmetic on a machine with 128-bit␊ |
| 53 | * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines␊ |
| 54 | * with 48-bit longs.␊ |
| 55 | */␊ |
| 56 | ␊ |
| 57 | #include <sys/cdefs.h>␊ |
| 58 | #include <sys/types.h>␊ |
| 59 | #include <limits.h>␊ |
| 60 | ␊ |
| 61 | /*␊ |
| 62 | * Depending on the desired operation, we view a `long long' (aka quad_t) in␊ |
| 63 | * one or more of the following formats.␊ |
| 64 | */␊ |
| 65 | union uu {␊ |
| 66 | ␉quad_t␉q;␉␉/* as a (signed) quad */␊ |
| 67 | ␉quad_t␉uq;␉␉/* as an unsigned quad */␊ |
| 68 | ␉long␉sl[2];␉␉/* as two signed longs */␊ |
| 69 | ␉u_long␉ul[2];␉␉/* as two unsigned longs */␊ |
| 70 | };␊ |
| 71 | ␊ |
| 72 | /*␊ |
| 73 | * Define high and low longwords.␊ |
| 74 | */␊ |
| 75 | #define␉Hi␉␉_QUAD_HIGHWORD␊ |
| 76 | #define␉Lo␉␉_QUAD_LOWWORD␊ |
| 77 | ␊ |
| 78 | /*␊ |
| 79 | * Total number of bits in a quad_t and in the pieces that make it up.␊ |
| 80 | * These are used for shifting, and also below for halfword extraction␊ |
| 81 | * and assembly.␊ |
| 82 | */␊ |
| 83 | #define␉QUAD_BITS␉(sizeof(quad_t) * CHAR_BIT)␊ |
| 84 | #define␉LONG_BITS␉(sizeof(long) * CHAR_BIT)␊ |
| 85 | #define␉HALF_BITS␉(sizeof(long) * CHAR_BIT / 2)␊ |
| 86 | ␊ |
| 87 | /*␊ |
| 88 | * Extract high and low shortwords from longword, and move low shortword of␊ |
| 89 | * longword to upper half of long, i.e., produce the upper longword of␊ |
| 90 | * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)␊ |
| 91 | *␊ |
| 92 | * These are used in the multiply code, to split a longword into upper␊ |
| 93 | * and lower halves, and to reassemble a product as a quad_t, shifted left␊ |
| 94 | * (sizeof(long)*CHAR_BIT/2).␊ |
| 95 | */␊ |
| 96 | #define␉HHALF(x)␉((x) >> HALF_BITS)␊ |
| 97 | #define␉LHALF(x)␉((x) & ((1 << HALF_BITS) - 1))␊ |
| 98 | #define␉LHUP(x)␉␉((x) << HALF_BITS)␊ |
| 99 | ␊ |
| 100 | quad_t␉␉__divdi3 __P((quad_t a, quad_t b));␊ |
| 101 | quad_t␉␉__moddi3 __P((quad_t a, quad_t b));␊ |
| 102 | u_quad_t␉__qdivrem __P((u_quad_t u, u_quad_t v, u_quad_t *rem));␊ |
| 103 | u_quad_t␉__udivdi3 __P((u_quad_t a, u_quad_t b));␊ |
| 104 | u_quad_t␉__umoddi3 __P((u_quad_t a, u_quad_t b));␊ |
| 105 | ␊ |
| 106 | /*␊ |
| 107 | * XXX␊ |
| 108 | * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument␊ |
| 109 | * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use␊ |
| 110 | * both compilers.␊ |
| 111 | */␊ |
| 112 | #if __GNUC__ >= 2␊ |
| 113 | typedef unsigned int␉qshift_t;␊ |
| 114 | #else␊ |
| 115 | typedef u_quad_t␉qshift_t;␊ |
| 116 | #endif␊ |
| 117 | ␊ |
| 118 | ␊ |
| 119 | ␊ |
| 120 | ␊ |
| 121 | ␊ |
| 122 | ␊ |
| 123 | ␊ |
| 124 | ␊ |
| 125 | ␊ |
| 126 | |
