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 .file "lshiftl.s" 31 32/* 33 * Shift a double long value. Ported from m32 version to sparc. 34 * 35 * dl_t 36 * lshiftl (op, cnt) 37 * dl_t op; 38 * int cnt; 39 */ 40 41#include "SYS.h" 42 43 ENTRY(lshiftl) 44 45 ld [%o7+8],%o4 ! Instruction at ret-addr should be a 46 cmp %o4,8 ! 'unimp 8' indicating a valid call. 47 be 1f ! if OK, go forward. 48 nop ! delay instruction. 49 jmp %o7+8 ! return 50 nop ! delay instruction. 51 521: 53 ld [%o0+0],%o2 ! fetch op.dl_hop 54 ld [%o0+4],%o3 ! fetch op.dl_lop 55 subcc %g0,%o1,%o4 ! test cnt < 0 and save reciprocol 56 bz .done 57 ld [%sp+(16*4)],%o0 ! address to store result into 58 bg .right ! 59 nop 60 ! Positive (or null) shift (left) 61 and %o1,0x3f,%o1 ! Reduce range to 0..63 62 subcc %o1,32,%o5 ! cnt - 32 (also test cnt >= 32) 63 bneg,a .leftsmall ! 64 add %o4,32,%o4 ! 32 - cnt (actually ((-cnt) + 32) 65 sll %o3,%o5,%o2 ! R.h = R.l << (cnt - 32) 66 ba .done ! 67 or %g0,%g0,%o3 ! R.l = 0 68 69.leftsmall: 70 srl %o3,%o4,%o5 ! temp = R.l >> (31 - cnt) 71 sll %o3,%o1,%o3 ! R.l = R.l << cnt 72 sll %o2,%o1,%o2 ! R.h = R.h << cnt 73 ba .done ! 74 or %o2,%o5,%o2 ! R.h = R.h | temp 75 76.right: ! Negative shift (right) 77 and %o4,0x3f,%o4 ! Reduce range to 0..63 78 subcc %o4,32,%o5 ! cnt - 32 (also test cnt >= 32) 79 bneg,a .rightsmall ! 80 add %o1,32,%o1 ! 32 - cnt (actually ((-cnt) + 32) 81 srl %o2,%o5,%o3 ! R.l = R.h >> (cnt - 32) 82 ba .done ! 83 or %g0,%g0,%o2 ! R.h = 0 84 85.rightsmall: 86 sll %o2,%o1,%o5 ! temp = R.h << (31 - cnt) 87 srl %o3,%o4,%o3 ! R.l = R.l >> cnt 88 srl %o2,%o4,%o2 ! R.h = R.h >> cnt 89 ba .done ! 90 or %o3,%o5,%o3 ! R.l = R.l | temp 91 92.done: 93 st %o2,[%o0+0] ! store result, dl_hop 94 jmp %o7+12 ! return 95 st %o3,[%o0+4] ! store result, dl_lop 96 97 SET_SIZE(lshiftl) 98