usr/src/lib/libc/amd64/gen/abs.s
author Mark J. Nelson <Mark.J.Nelson@Sun.COM>
Wed, 06 Aug 2008 16:29:39 -0600
changeset 7298 b69e27387f74
parent 6812 febeba71273d
permissions -rw-r--r--
6733918 Teamware has retired, please welcome your new manager, Mercurial 4758439 some files use "current date" sccs keywords 6560843 asm sources should not rely on .file "%M%" for naming STT_FILE symbols 6560958 Solaris:: perl modules should not use SCCS keywords in version information 6729074 webrev doesn't deal well with remote ssh hg parents

/*
 * 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.
 */

	.file	"abs.s"

/*
 *	Assembler program to implement the following C program
 *
 *	int
 *	abs(int arg)
 *	{
 *		return((arg < 0)? -arg: arg);
 *	}
 */

#include "SYS.h"

	ENTRY(abs)
	movl	%edi, %eax
	testl	%eax, %eax	/* arg < 0? */
	jns	1f
	negl	%eax		/* yes, return -arg */
1:
	ret
	SET_SIZE(abs)

 	ENTRY(labs)
 	movq	%rdi, %rax
 	testq	%rax, %rax	/* arg < 0? */
 	jns	1f
 	negq	%rax		/* yes, return -arg */
1:
 	ret
 	SET_SIZE(labs)

 	ENTRY(llabs)
 	movq	%rdi, %rax
 	testq	%rax, %rax	/* arg < 0? */
 	jns	1f
 	negq	%rax		/* yes, return -arg */
1:
 	ret
 	SET_SIZE(llabs)