1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27/* Copyright (c) 1988 AT&T */ 28/* All Rights Reserved */ 29 30#pragma ident "%Z%%M% %I% %E% SMI" 31 32/* 33 * This set of routines used to be implemented mostly in assembler. 34 * 35 * Since the purpose they have is now rather vestigial, and 64-bit 36 * machines can do operations on 64-bit quantities pretty efficiently, 37 * a C implementation seems quite adequate and much more maintainable. 38 */ 39 40#include "lint.h" 41#include <sys/types.h> 42#include <sys/dl.h> 43 44typedef union { 45 long xword; 46 dl_t dl; 47} dlx_t; 48 49dl_t 50ladd(dl_t lop, dl_t rop) 51{ 52 dlx_t r; 53 /* LINTED pointer cast may result in improper alignment */ 54 r.xword = *(long *)&lop + *(long *)&rop; 55 return (r.dl); 56} 57 58dl_t 59lshiftl(dl_t op, int cnt) 60{ 61 dlx_t r; 62 if (cnt < 0) 63 /* LINTED pointer cast may result in improper alignment */ 64 r.xword = (long)(*(ulong_t *)&op >> (-cnt)); 65 else 66 /* LINTED pointer cast may result in improper alignment */ 67 r.xword = *(long *)&op << cnt; 68 return (r.dl); 69} 70 71int 72lsign(dl_t op) 73{ 74 /* LINTED pointer cast may result in improper alignment */ 75 return ((*(long *)&op) >> 63); 76} 77 78dl_t 79lsub(dl_t lop, dl_t rop) 80{ 81 dlx_t r; 82 /* LINTED pointer cast may result in improper alignment */ 83 r.xword = *(long *)&lop - *(long *)&rop; 84 return (r.dl); 85} 86 87dl_t 88lmul(dl_t lop, dl_t rop) 89{ 90 dlx_t r; 91 /* LINTED pointer cast may result in improper alignment */ 92 r.xword = *(long *)&lop * *(long *)&rop; 93 return (r.dl); 94} 95