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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* Copyright (c) 1988 AT&T */ 23/* All Rights Reserved */ 24 25 26/* Copyright (c) 1989 by Sun Microsystems, Inc. */ 27 28.ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */ 29 30/* 31 * Shift a double long value. Ported from m32 version to sparc. 32 * 33 * dl_t 34 * lshiftl (op, cnt) 35 * dl_t op; 36 * int cnt; 37 */ 38 39 .file "lshiftl.s" 40 41#include <sys/asm_linkage.h> 42 43 ANSI_PRAGMA_WEAK(lshiftl,function) 44 45#include "synonyms.h" 46 47 48 ENTRY(lshiftl) 49 50 ld [%o7+8],%o4 ! Instruction at ret-addr should be a 51 cmp %o4,8 ! 'unimp 8' indicating a valid call. 52 be 1f ! if OK, go forward. 53 nop ! delay instruction. 54 jmp %o7+8 ! return 55 nop ! delay instruction. 56 571: 58 ld [%o0+0],%o2 ! fetch op.dl_hop 59 ld [%o0+4],%o3 ! fetch op.dl_lop 60 subcc %g0,%o1,%o4 ! test cnt < 0 and save reciprocol 61 bz .done 62 ld [%sp+(16*4)],%o0 ! address to store result into 63 bg .right ! 64 nop 65 ! Positive (or null) shift (left) 66 and %o1,0x3f,%o1 ! Reduce range to 0..63 67 subcc %o1,32,%o5 ! cnt - 32 (also test cnt >= 32) 68 bneg,a .leftsmall ! 69 add %o4,32,%o4 ! 32 - cnt (actually ((-cnt) + 32) 70 sll %o3,%o5,%o2 ! R.h = R.l << (cnt - 32) 71 ba .done ! 72 or %g0,%g0,%o3 ! R.l = 0 73 74.leftsmall: 75 srl %o3,%o4,%o5 ! temp = R.l >> (31 - cnt) 76 sll %o3,%o1,%o3 ! R.l = R.l << cnt 77 sll %o2,%o1,%o2 ! R.h = R.h << cnt 78 ba .done ! 79 or %o2,%o5,%o2 ! R.h = R.h | temp 80 81.right: ! Negative shift (right) 82 and %o4,0x3f,%o4 ! Reduce range to 0..63 83 subcc %o4,32,%o5 ! cnt - 32 (also test cnt >= 32) 84 bneg,a .rightsmall ! 85 add %o1,32,%o1 ! 32 - cnt (actually ((-cnt) + 32) 86 srl %o2,%o5,%o3 ! R.l = R.h >> (cnt - 32) 87 ba .done ! 88 or %g0,%g0,%o2 ! R.h = 0 89 90.rightsmall: 91 sll %o2,%o1,%o5 ! temp = R.h << (31 - cnt) 92 srl %o3,%o4,%o3 ! R.l = R.l >> cnt 93 srl %o2,%o4,%o2 ! R.h = R.h >> cnt 94 ba .done ! 95 or %o3,%o5,%o3 ! R.l = R.l | temp 96 97.done: 98 st %o2,[%o0+0] ! store result, dl_hop 99 jmp %o7+12 ! return 100 st %o3,[%o0+4] ! store result, dl_lop 101 102 SET_SIZE(lshiftl) 103