1*22028508SToomas Soome /*- 2*22028508SToomas Soome * Copyright (c) 1992, 1993 3*22028508SToomas Soome * The Regents of the University of California. All rights reserved. 4*22028508SToomas Soome * 5*22028508SToomas Soome * This software was developed by the Computer Systems Engineering group 6*22028508SToomas Soome * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7*22028508SToomas Soome * contributed to Berkeley. 8*22028508SToomas Soome * 9*22028508SToomas Soome * Redistribution and use in source and binary forms, with or without 10*22028508SToomas Soome * modification, are permitted provided that the following conditions 11*22028508SToomas Soome * are met: 12*22028508SToomas Soome * 1. Redistributions of source code must retain the above copyright 13*22028508SToomas Soome * notice, this list of conditions and the following disclaimer. 14*22028508SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 15*22028508SToomas Soome * notice, this list of conditions and the following disclaimer in the 16*22028508SToomas Soome * documentation and/or other materials provided with the distribution. 17*22028508SToomas Soome * 3. Neither the name of the University nor the names of its contributors 18*22028508SToomas Soome * may be used to endorse or promote products derived from this software 19*22028508SToomas Soome * without specific prior written permission. 20*22028508SToomas Soome * 21*22028508SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22*22028508SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23*22028508SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24*22028508SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25*22028508SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26*22028508SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27*22028508SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28*22028508SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29*22028508SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30*22028508SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31*22028508SToomas Soome * SUCH DAMAGE. 32*22028508SToomas Soome * 33*22028508SToomas Soome * @(#)quad.h 8.1 (Berkeley) 6/4/93 34*22028508SToomas Soome * $FreeBSD$ 35*22028508SToomas Soome */ 36*22028508SToomas Soome 37*22028508SToomas Soome /* 38*22028508SToomas Soome * Quad arithmetic. 39*22028508SToomas Soome * 40*22028508SToomas Soome * This library makes the following assumptions: 41*22028508SToomas Soome * 42*22028508SToomas Soome * - The type long long (aka quad_t) exists. 43*22028508SToomas Soome * 44*22028508SToomas Soome * - A quad variable is exactly twice as long as `long'. 45*22028508SToomas Soome * 46*22028508SToomas Soome * - The machine's arithmetic is two's complement. 47*22028508SToomas Soome * 48*22028508SToomas Soome * This library can provide 128-bit arithmetic on a machine with 128-bit 49*22028508SToomas Soome * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines 50*22028508SToomas Soome * with 48-bit longs. 51*22028508SToomas Soome */ 52*22028508SToomas Soome 53*22028508SToomas Soome #include <sys/cdefs.h> 54*22028508SToomas Soome #include <sys/types.h> 55*22028508SToomas Soome #include <limits.h> 56*22028508SToomas Soome 57*22028508SToomas Soome _Static_assert(sizeof(quad_t) == sizeof(int) * 2, 58*22028508SToomas Soome "Bitwise function in libstand are broken on this architecture\n"); 59*22028508SToomas Soome 60*22028508SToomas Soome /* 61*22028508SToomas Soome * Depending on the desired operation, we view a `long long' (aka quad_t) in 62*22028508SToomas Soome * one or more of the following formats. 63*22028508SToomas Soome */ 64*22028508SToomas Soome union uu { 65*22028508SToomas Soome quad_t q; /* as a (signed) quad */ 66*22028508SToomas Soome quad_t uq; /* as an unsigned quad */ 67*22028508SToomas Soome int sl[2]; /* as two signed ints */ 68*22028508SToomas Soome u_int ul[2]; /* as two unsigned ints */ 69*22028508SToomas Soome }; 70*22028508SToomas Soome 71*22028508SToomas Soome /* 72*22028508SToomas Soome * Define high and low longwords. 73*22028508SToomas Soome */ 74*22028508SToomas Soome #define H _QUAD_HIGHWORD 75*22028508SToomas Soome #define L _QUAD_LOWWORD 76*22028508SToomas Soome 77*22028508SToomas Soome /* 78*22028508SToomas Soome * Total number of bits in a quad_t and in the pieces that make it up. 79*22028508SToomas Soome * These are used for shifting, and also below for halfword extraction 80*22028508SToomas Soome * and assembly. 81*22028508SToomas Soome */ 82*22028508SToomas Soome #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) 83*22028508SToomas Soome #define HALF_BITS (sizeof(int) * CHAR_BIT / 2) 84*22028508SToomas Soome 85*22028508SToomas Soome /* 86*22028508SToomas Soome * Extract high and low shortwords from longword, and move low shortword of 87*22028508SToomas Soome * longword to upper half of long, i.e., produce the upper longword of 88*22028508SToomas Soome * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.) 89*22028508SToomas Soome * 90*22028508SToomas Soome * These are used in the multiply code, to split a longword into upper 91*22028508SToomas Soome * and lower halves, and to reassemble a product as a quad_t, shifted left 92*22028508SToomas Soome * (sizeof(long)*CHAR_BIT/2). 93*22028508SToomas Soome */ 94*22028508SToomas Soome #define HHALF(x) ((x) >> HALF_BITS) 95*22028508SToomas Soome #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1)) 96*22028508SToomas Soome #define LHUP(x) ((x) << HALF_BITS) 97*22028508SToomas Soome 98*22028508SToomas Soome quad_t __divdi3(quad_t a, quad_t b); 99*22028508SToomas Soome quad_t __moddi3(quad_t a, quad_t b); 100*22028508SToomas Soome u_quad_t __udivmoddi4(u_quad_t u, u_quad_t v, u_quad_t *rem); 101*22028508SToomas Soome u_quad_t __udivdi3(u_quad_t a, u_quad_t b); 102*22028508SToomas Soome u_quad_t __umoddi3(u_quad_t a, u_quad_t b); 103*22028508SToomas Soome 104*22028508SToomas Soome /* 105*22028508SToomas Soome * XXX 106*22028508SToomas Soome * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument 107*22028508SToomas Soome * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use 108*22028508SToomas Soome * both compilers. 109*22028508SToomas Soome */ 110*22028508SToomas Soome #if __GNUC__ >= 2 111*22028508SToomas Soome typedef unsigned int qshift_t; 112*22028508SToomas Soome #else 113*22028508SToomas Soome typedef u_quad_t qshift_t; 114*22028508SToomas Soome #endif 115