quad.h revision 128965
1227825Stheraven/*- 2227825Stheraven * Copyright (c) 1992, 1993 3227825Stheraven * The Regents of the University of California. All rights reserved. 4227825Stheraven * 5227825Stheraven * This software was developed by the Computer Systems Engineering group 6227825Stheraven * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7227825Stheraven * contributed to Berkeley. 8227825Stheraven * 9227825Stheraven * Redistribution and use in source and binary forms, with or without 10227825Stheraven * modification, are permitted provided that the following conditions 11227825Stheraven * are met: 12227825Stheraven * 1. Redistributions of source code must retain the above copyright 13227825Stheraven * notice, this list of conditions and the following disclaimer. 14227825Stheraven * 2. Redistributions in binary form must reproduce the above copyright 15227825Stheraven * notice, this list of conditions and the following disclaimer in the 16227825Stheraven * documentation and/or other materials provided with the distribution. 17227825Stheraven * 4. Neither the name of the University nor the names of its contributors 18227825Stheraven * may be used to endorse or promote products derived from this software 19227825Stheraven * without specific prior written permission. 20227825Stheraven * 21227825Stheraven * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22227825Stheraven * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23227825Stheraven * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24227825Stheraven * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25227825Stheraven * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26227825Stheraven * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27227825Stheraven * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28227825Stheraven * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29227825Stheraven * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30227825Stheraven * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31227825Stheraven * SUCH DAMAGE. 32227825Stheraven * 33227825Stheraven * @(#)quad.h 8.1 (Berkeley) 6/4/93 34227825Stheraven * $FreeBSD: head/sys/libkern/quad.h 128965 2004-05-05 15:12:55Z bde $ 35227825Stheraven */ 36227825Stheraven 37227825Stheraven#ifndef _LIBKERN_QUAD_H_ 38227825Stheraven#define _LIBKERN_QUAD_H_ 39227825Stheraven 40227825Stheraven/* 41227825Stheraven * Quad arithmetic. 42227825Stheraven * 43227825Stheraven * This library makes the following assumptions: 44227825Stheraven * 45227825Stheraven * - The type long long (aka quad_t) exists. 46227825Stheraven * 47227825Stheraven * - A quad variable is exactly twice as long as `long'. 48227825Stheraven * 49227825Stheraven * - The machine's arithmetic is two's complement. 50227825Stheraven * 51227825Stheraven * This library can provide 128-bit arithmetic on a machine with 128-bit 52227825Stheraven * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines 53 * with 48-bit longs. 54 */ 55 56#include <sys/cdefs.h> 57#include <sys/types.h> 58#include <sys/limits.h> 59#include <sys/syslimits.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 */ 65union 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 H _QUAD_HIGHWORD 76#define L _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 100typedef unsigned int qshift_t; 101 102quad_t __ashldi3(quad_t, qshift_t); 103quad_t __ashrdi3(quad_t, qshift_t); 104quad_t __divdi3(quad_t a, quad_t b); 105quad_t __lshrdi3(quad_t, qshift_t); 106quad_t __moddi3(quad_t a, quad_t b); 107u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); 108u_quad_t __udivdi3(u_quad_t a, u_quad_t b); 109u_quad_t __umoddi3(u_quad_t a, u_quad_t b); 110int __ucmpdi2(u_quad_t a, u_quad_t b); 111 112#endif /* !_LIBKERN_QUAD_H_ */ 113