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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This set of routines used to be implemented mostly in assembler.
*
* Since the purpose they have is now rather vestigial, and 64-bit
* machines can do operations on 64-bit quantities pretty efficiently,
* a C implementation seems quite adequate and much more maintainable.
*/
#include "lint.h"
#include <sys/types.h>
#include <sys/dl.h>
typedef union {
long xword;
dl_t dl;
} dlx_t;
dl_t
ladd(dl_t lop, dl_t rop)
{
dlx_t r;
/* LINTED pointer cast may result in improper alignment */
r.xword = *(long *)&lop + *(long *)&rop;
return (r.dl);
}
dl_t
lshiftl(dl_t op, int cnt)
{
dlx_t r;
if (cnt < 0)
/* LINTED pointer cast may result in improper alignment */
r.xword = (long)(*(ulong_t *)&op >> (-cnt));
else
/* LINTED pointer cast may result in improper alignment */
r.xword = *(long *)&op << cnt;
return (r.dl);
}
int
lsign(dl_t op)
{
/* LINTED pointer cast may result in improper alignment */
return ((*(long *)&op) >> 63);
}
dl_t
lsub(dl_t lop, dl_t rop)
{
dlx_t r;
/* LINTED pointer cast may result in improper alignment */
r.xword = *(long *)&lop - *(long *)&rop;
return (r.dl);
}
dl_t
lmul(dl_t lop, dl_t rop)
{
dlx_t r;
/* LINTED pointer cast may result in improper alignment */
r.xword = *(long *)&lop * *(long *)&rop;
return (r.dl);
}
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