lshiftl.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/* Copyright (c) 1989 by Sun Microsystems, Inc. */
.ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
/*
* Shift a double long value. Ported from m32 version to sparc.
*
* dl_t
* lshiftl (op, cnt)
* dl_t op;
* int cnt;
*/
.file "lshiftl.s"
#include <sys/asm_linkage.h>
ANSI_PRAGMA_WEAK(lshiftl,function)
#include "synonyms.h"
ENTRY(lshiftl)
ld [%o7+8],%o4 ! Instruction at ret-addr should be a
cmp %o4,8 ! 'unimp 8' indicating a valid call.
be 1f ! if OK, go forward.
nop ! delay instruction.
jmp %o7+8 ! return
nop ! delay instruction.
1:
ld [%o0+0],%o2 ! fetch op.dl_hop
ld [%o0+4],%o3 ! fetch op.dl_lop
subcc %g0,%o1,%o4 ! test cnt < 0 and save reciprocol
bz .done
ld [%sp+(16*4)],%o0 ! address to store result into
bg .right !
nop
! Positive (or null) shift (left)
and %o1,0x3f,%o1 ! Reduce range to 0..63
subcc %o1,32,%o5 ! cnt - 32 (also test cnt >= 32)
bneg,a .leftsmall !
add %o4,32,%o4 ! 32 - cnt (actually ((-cnt) + 32)
sll %o3,%o5,%o2 ! R.h = R.l << (cnt - 32)
ba .done !
or %g0,%g0,%o3 ! R.l = 0
.leftsmall:
srl %o3,%o4,%o5 ! temp = R.l >> (31 - cnt)
sll %o3,%o1,%o3 ! R.l = R.l << cnt
sll %o2,%o1,%o2 ! R.h = R.h << cnt
ba .done !
or %o2,%o5,%o2 ! R.h = R.h | temp
.right: ! Negative shift (right)
and %o4,0x3f,%o4 ! Reduce range to 0..63
subcc %o4,32,%o5 ! cnt - 32 (also test cnt >= 32)
bneg,a .rightsmall !
add %o1,32,%o1 ! 32 - cnt (actually ((-cnt) + 32)
srl %o2,%o5,%o3 ! R.l = R.h >> (cnt - 32)
ba .done !
or %g0,%g0,%o2 ! R.h = 0
.rightsmall:
sll %o2,%o1,%o5 ! temp = R.h << (31 - cnt)
srl %o3,%o4,%o3 ! R.l = R.l >> cnt
srl %o2,%o4,%o2 ! R.h = R.h >> cnt
ba .done !
or %o3,%o5,%o3 ! R.l = R.l | temp
.done:
st %o2,[%o0+0] ! store result, dl_hop
jmp %o7+12 ! return
st %o3,[%o0+4] ! store result, dl_lop
SET_SIZE(lshiftl)