abs.s revision 1219:f89f56c2d9ac 
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
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28	.ident	"%Z%%M%	%I%	%E% SMI"
29
30	.file	"%M%"
31
32/*
33 *	Assembler program to implement the following C program
34 *
35 *	int
36 *	abs(int arg)
37 *	{
38 *		return((arg < 0)? -arg: arg);
39 *	}
40 */
41
42#include <sys/asm_linkage.h>
43
44	ANSI_PRAGMA_WEAK(llabs,function)
45
46#include "SYS.h"
47
48	ENTRY(abs)
49	movl	%edi, %eax
50	testl	%eax, %eax	/* arg < 0? */
51	jns	1f
52	negl	%eax		/* yes, return -arg */
531:
54	ret
55	SET_SIZE(abs)
56
57 	ENTRY(labs)
58 	movq	%rdi, %rax
59 	testq	%rax, %rax	/* arg < 0? */
60 	jns	1f
61 	negq	%rax		/* yes, return -arg */
621:
63 	ret
64 	SET_SIZE(labs)
65
66 	ENTRY(llabs)
67 	movq	%rdi, %rax
68 	testq	%rax, %rax	/* arg < 0? */
69 	jns	1f
70 	negq	%rax		/* yes, return -arg */
711:
72 	ret
73 	SET_SIZE(llabs)
74