1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 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 `long'. 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 longs, for instance, or 96-bit arithmetic on machines 49 * with 48-bit longs. 50 */ 51 52 #include <sys/types.h> 53 #include <limits.h> 54 55 /* 56 * Depending on the desired operation, we view a `long long' (aka quad_t) in 57 * one or more of the following formats. 58 */ 59 union uu { 60 quad_t q; /* as a (signed) quad */ 61 quad_t uq; /* as an unsigned quad */ 62 long sl[2]; /* as two signed longs */ 63 u_long ul[2]; /* as two unsigned longs */ 64 }; 65 66 /* 67 * Define high and low longwords. 68 */ 69 #define H _QUAD_HIGHWORD 70 #define L _QUAD_LOWWORD 71 72 /* 73 * Total number of bits in a quad_t and in the pieces that make it up. 74 * These are used for shifting, and also below for halfword extraction 75 * and assembly. 76 */ 77 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) 78 #define LONG_BITS (sizeof(long) * CHAR_BIT) 79 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2) 80 81 /* 82 * Extract high and low shortwords from longword, and move low shortword of 83 * longword to upper half of long, i.e., produce the upper longword of 84 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.) 85 * 86 * These are used in the multiply code, to split a longword into upper 87 * and lower halves, and to reassemble a product as a quad_t, shifted left 88 * (sizeof(long)*CHAR_BIT/2). 89 */ 90 #define HHALF(x) ((x) >> HALF_BITS) 91 #define LHALF(x) ((x) & ((1L << HALF_BITS) - 1)) 92 #define LHUP(x) ((x) << HALF_BITS) 93 94 int __cmpdi2(quad_t a, quad_t b); 95 quad_t __divdi3(quad_t a, quad_t b); 96 quad_t __moddi3(quad_t a, quad_t b); 97 u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); 98 int __ucmpdi2(u_quad_t a, u_quad_t b); 99 u_quad_t __udivdi3(u_quad_t a, u_quad_t b); 100 u_quad_t __umoddi3(u_quad_t a, u_quad_t b); 101 102 typedef unsigned int qshift_t; 103