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 1.10 2008/02/25 21:21:58 deraadt 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 __iordi3(quad_t, quad_t); 117 quad_t __lshldi3(quad_t, qshift_t); 118 quad_t __lshrdi3(quad_t, qshift_t); 119 quad_t __moddi3(quad_t, quad_t); 120 quad_t __muldi3(quad_t, quad_t); 121 quad_t __negdi2(quad_t); 122 quad_t __one_cmpldi2(quad_t); 123 u_quad_t __qdivrem(u_quad_t, u_quad_t, u_quad_t *); 124 quad_t __subdi3(quad_t, quad_t); 125 int __ucmpdi2(u_quad_t, u_quad_t); 126 u_quad_t __udivdi3(u_quad_t, u_quad_t ); 127 u_quad_t __umoddi3(u_quad_t, u_quad_t ); 128 quad_t __xordi3(quad_t, quad_t); 129