isnanl.s revision ddc0e0b53c661f6e439e3b7072b3ef353eadb4af
/*
* 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 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "isnanl.s"
#include "libm.h"
LIBM_ANSI_PRAGMA_WEAK(isnanl,function)
ENTRY(isnanl)
movl 12(%esp),%eax / ax <-- sign bit and exp
andl $0x00007fff,%eax
jz .not_nan / jump if exp is all 0
xorl $0x00007fff,%eax
jz .nan_or_inf / jump if exp is all 1
testl $0x80000000,8(%esp)
jz .got_nan / jump if leading bit is 0
movl $0,%eax
.not_nan:
ret
.nan_or_inf: / note that %eax = 0 from before
cmpl $0x80000000,8(%esp) / what is first half of significand?
jnz .got_nan / jump if not equal to 0x80000000
testl $0xffffffff,4(%esp) / is second half of significand 0?
jnz .got_nan / jump if not equal to 0
ret
.got_nan:
movl $1,%eax
ret
.align 4
SET_SIZE(isnanl)