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 .file "%M%" 33 34/* 35 * Shift a double long value. Ported from m32 version to sparc. 36 * 37 * dl_t 38 * lshiftl (op, cnt) 39 * dl_t op; 40 * int cnt; 41 */ 42 43#include "SYS.h" 44 45 ENTRY(lshiftl) 46 47 ld [%o7+8],%o4 ! Instruction at ret-addr should be a 48 cmp %o4,8 ! 'unimp 8' indicating a valid call. 49 be 1f ! if OK, go forward. 50 nop ! delay instruction. 51 jmp %o7+8 ! return 52 nop ! delay instruction. 53 541: 55 ld [%o0+0],%o2 ! fetch op.dl_hop 56 ld [%o0+4],%o3 ! fetch op.dl_lop 57 subcc %g0,%o1,%o4 ! test cnt < 0 and save reciprocol 58 bz .done 59 ld [%sp+(16*4)],%o0 ! address to store result into 60 bg .right ! 61 nop 62 ! Positive (or null) shift (left) 63 and %o1,0x3f,%o1 ! Reduce range to 0..63 64 subcc %o1,32,%o5 ! cnt - 32 (also test cnt >= 32) 65 bneg,a .leftsmall ! 66 add %o4,32,%o4 ! 32 - cnt (actually ((-cnt) + 32) 67 sll %o3,%o5,%o2 ! R.h = R.l << (cnt - 32) 68 ba .done ! 69 or %g0,%g0,%o3 ! R.l = 0 70 71.leftsmall: 72 srl %o3,%o4,%o5 ! temp = R.l >> (31 - cnt) 73 sll %o3,%o1,%o3 ! R.l = R.l << cnt 74 sll %o2,%o1,%o2 ! R.h = R.h << cnt 75 ba .done ! 76 or %o2,%o5,%o2 ! R.h = R.h | temp 77 78.right: ! Negative shift (right) 79 and %o4,0x3f,%o4 ! Reduce range to 0..63 80 subcc %o4,32,%o5 ! cnt - 32 (also test cnt >= 32) 81 bneg,a .rightsmall ! 82 add %o1,32,%o1 ! 32 - cnt (actually ((-cnt) + 32) 83 srl %o2,%o5,%o3 ! R.l = R.h >> (cnt - 32) 84 ba .done ! 85 or %g0,%g0,%o2 ! R.h = 0 86 87.rightsmall: 88 sll %o2,%o1,%o5 ! temp = R.h << (31 - cnt) 89 srl %o3,%o4,%o3 ! R.l = R.l >> cnt 90 srl %o2,%o4,%o2 ! R.h = R.h >> cnt 91 ba .done ! 92 or %o3,%o5,%o3 ! R.l = R.l | temp 93 94.done: 95 st %o2,[%o0+0] ! store result, dl_hop 96 jmp %o7+12 ! return 97 st %o3,[%o0+4] ! store result, dl_lop 98 99 SET_SIZE(lshiftl) 100