isnanl.s revision 25c28e83beb90e7c80452a7c818c5e6f73a07dc8
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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
23 */
24/*
25 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
26 * Use is subject to license terms.
27 */
28
29        .file "isnanl.s"
30
31#include "libm.h"
32LIBM_ANSI_PRAGMA_WEAK(isnanl,function)
33#include "libm_synonyms.h"
34
35	ENTRY(isnanl)
36	movl    12(%esp),%eax		/ ax <-- sign bit and exp
37	andl    $0x00007fff,%eax
38	jz	.not_nan		/ jump if exp is all 0
39	xorl    $0x00007fff,%eax
40	jz	.nan_or_inf		/ jump if exp is all 1
41	testl   $0x80000000,8(%esp)
42	jz	.got_nan		/ jump if leading bit is 0
43	movl	$0,%eax
44.not_nan:
45	ret
46.nan_or_inf:				/ note that %eax = 0 from before
47	cmpl    $0x80000000,8(%esp)     / what is first half of significand?
48	jnz	.got_nan		/ jump if not equal to 0x80000000
49	testl	$0xffffffff,4(%esp)	/ is second half of significand 0?
50	jnz	.got_nan		/ jump if not equal to 0
51	ret
52.got_nan:
53	movl	$1,%eax
54	ret
55	.align	4
56	SET_SIZE(isnanl)
57