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 * 4. 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 * @(#)quad.h 8.1 (Berkeley) 6/4/93 34 * $FreeBSD$ 35 */ 36 37 /* 38 * Quad arithmetic. 39 * 40 * This library makes the following assumptions: 41 * 42 * - The type long long (aka quad_t) exists. 43 * 44 * - A quad variable is exactly twice as long as `long'. 45 * 46 * - The machine's arithmetic is two's complement. 47 * 48 * This library can provide 128-bit arithmetic on a machine with 128-bit 49 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines 50 * with 48-bit longs. 51 */ 52 53 #include <sys/types.h> 54 #include <limits.h> 55 56 /* 57 * Depending on the desired operation, we view a `long long' (aka quad_t) in 58 * one or more of the following formats. 59 */ 60 union uu { 61 quad_t q; /* as a (signed) quad */ 62 quad_t uq; /* as an unsigned quad */ 63 long sl[2]; /* as two signed longs */ 64 u_long ul[2]; /* as two unsigned longs */ 65 }; 66 67 /* 68 * Define high and low longwords. 69 */ 70 #define H _QUAD_HIGHWORD 71 #define L _QUAD_LOWWORD 72 73 /* 74 * Total number of bits in a quad_t and in the pieces that make it up. 75 * These are used for shifting, and also below for halfword extraction 76 * and assembly. 77 */ 78 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) 79 #define LONG_BITS (sizeof(long) * CHAR_BIT) 80 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2) 81 82 /* 83 * Extract high and low shortwords from longword, and move low shortword of 84 * longword to upper half of long, i.e., produce the upper longword of 85 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.) 86 * 87 * These are used in the multiply code, to split a longword into upper 88 * and lower halves, and to reassemble a product as a quad_t, shifted left 89 * (sizeof(long)*CHAR_BIT/2). 90 */ 91 #define HHALF(x) ((x) >> HALF_BITS) 92 #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1)) 93 #define LHUP(x) ((x) << HALF_BITS) 94 95 int __cmpdi2(quad_t a, quad_t b); 96 quad_t __divdi3(quad_t a, quad_t b); 97 quad_t __moddi3(quad_t a, quad_t b); 98 u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); 99 int __ucmpdi2(u_quad_t a, u_quad_t b); 100 u_quad_t __udivdi3(u_quad_t a, u_quad_t b); 101 u_quad_t __umoddi3(u_quad_t a, u_quad_t b); 102 103 typedef unsigned int qshift_t; 104