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#pragma ident "%Z%%M% %I% %E% SMI" 28 29 .file "%M%" 30 31/ Shift a double long value. 32 33#include "SYS.h" 34 35 .set arg,8 36 .set cnt,16 37 .set ans,0 38 39 ENTRY(lshiftl) 40 popl %eax 41 xchgl %eax,0(%esp) 42 43 pushl %eax 44 movl arg(%esp),%eax 45 movl arg+4(%esp),%edx 46 movl cnt(%esp),%ecx 47 orl %ecx,%ecx 48 jz .lshiftld 49 jns .lshiftlp 50 51/ We are doing a negative (right) shift 52 53 negl %ecx 54 55.lshiftln: 56 sarl $1,%edx 57 rcrl $1,%eax 58 loop .lshiftln 59 jmp .lshiftld 60 61/ We are doing a positive (left) shift 62 63.lshiftlp: 64 shll $1,%eax 65 rcll $1,%edx 66 loop .lshiftlp 67 68/ We are done. 69 70.lshiftld: 71 movl %eax,%ecx 72 popl %eax 73 movl %ecx,ans(%eax) 74 movl %edx,ans+4(%eax) 75 76 ret 77 SET_SIZE(lshiftl) 78