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 * $MirOS: src/kern/include/quad.h,v 1.1 2008/08/01 16:10:57 tg Exp $ 34 * $OpenBSD: quad.h,v 1.6 2004/11/28 07:09:13 mickey Exp $ 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 `int'. 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 ints, for instance, or 96-bit arithmetic on machines 50 * with 48-bit ints. 51 */ 52 53 #include <sys/types.h> 54 #if !defined(_KERNEL) && !defined(_STANDALONE) 55 #include <limits.h> 56 #else 57 #include <sys/limits.h> 58 #endif 59 60 /* 61 * Depending on the desired operation, we view a `long long' (aka quad_t) in 62 * one or more of the following formats. 63 */ 64 union uu { 65 quad_t q; /* as a (signed) quad */ 66 u_quad_t uq; /* as an unsigned quad */ 67 int sl[2]; /* as two signed ints */ 68 u_int ul[2]; /* as two unsigned ints */ 69 }; 70 71 /* 72 * Define high and low parts of a quad_t. 73 */ 74 #define H _QUAD_HIGHWORD 75 #define L _QUAD_LOWWORD 76 77 /* 78 * Total number of bits in a quad_t and in the pieces that make it up. 79 * These are used for shifting, and also below for halfword extraction 80 * and assembly. 81 */ 82 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) 83 #define INT_BITS (sizeof(int) * CHAR_BIT) 84 #define HALF_BITS (sizeof(int) * CHAR_BIT / 2) 85 86 /* 87 * Extract high and low shortwords from longword, and move low shortword of 88 * longword to upper half of long, i.e., produce the upper longword of 89 * ((quad_t)(x) << (number_of_bits_in_int/2)). (`x' must actually be u_int.) 90 * 91 * These are used in the multiply code, to split a longword into upper 92 * and lower halves, and to reassemble a product as a quad_t, shifted left 93 * (sizeof(int)*CHAR_BIT/2). 94 */ 95 #define HHALF(x) ((u_int)(x) >> HALF_BITS) 96 #define LHALF(x) ((u_int)(x) & (((int)1 << HALF_BITS) - 1)) 97 #define LHUP(x) ((u_int)(x) << HALF_BITS) 98 99 typedef unsigned int qshift_t; 100 101 quad_t __adddi3(quad_t, quad_t); 102 quad_t __anddi3(quad_t, quad_t); 103 quad_t __ashldi3(quad_t, qshift_t); 104 quad_t __ashrdi3(quad_t, qshift_t); 105 int __cmpdi2(quad_t, quad_t); 106 quad_t __divdi3(quad_t, quad_t); 107 quad_t __fixdfdi(double); 108 quad_t __fixsfdi(float); 109 u_quad_t __fixunsdfdi(double); 110 u_quad_t __fixunssfdi(float); 111 double __floatdidf(quad_t); 112 float __floatdisf(quad_t); 113 double __floatunsdidf(u_quad_t); 114 quad_t __iordi3(quad_t, quad_t); 115 quad_t __lshldi3(quad_t, qshift_t); 116 quad_t __lshrdi3(quad_t, qshift_t); 117 quad_t __moddi3(quad_t, quad_t); 118 quad_t __muldi3(quad_t, quad_t); 119 quad_t __negdi2(quad_t); 120 quad_t __one_cmpldi2(quad_t); 121 u_quad_t __qdivrem(u_quad_t, u_quad_t, u_quad_t *); 122 quad_t __subdi3(quad_t, quad_t); 123 int __ucmpdi2(u_quad_t, u_quad_t); 124 u_quad_t __udivdi3(u_quad_t, u_quad_t ); 125 u_quad_t __umoddi3(u_quad_t, u_quad_t ); 126 quad_t __xordi3(quad_t, quad_t); 127