isnanf.s revision 25c28e83beb90e7c80452a7c818c5e6f73a07dc8
/*
* 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 "isnanf.s"
#include "libm.h"
LIBM_ANSI_PRAGMA_WEAK(isnanf,function)
.weak _isnanf
.type _isnanf,@function
_isnanf = __isnanf
#include "libm_synonyms.h"
ENTRY(isnanf)
movl 4(%esp),%eax / eax <-- x
andl $0x7fffffff,%eax / eax <-- abs(x)
subl $0x7f800000,%eax / ZF <-- 1 iff x is infinite
jae .nan_or_inf / no jump iff arg. is finite
movl $0,%eax
ret
.nan_or_inf:
jnz .got_nan / no jump if arg. infinite;
/ let nan waste time
ret / %eax = 0 here
.got_nan:
movl $1,%eax / %eax was 0, must be made 1 to
/ indicate TRUE
ret
.align 4
SET_SIZE(isnanf)