/*
 * 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 "isnan.s"

#include "libm.h"
LIBM_ANSI_PRAGMA_WEAK(isnan,function)
        .weak _isnan
        .type _isnan,@function
_isnan  = __isnan
        .weak _isnand
        .type _isnand,@function
_isnand = __isnan
        .weak isnand
        .type isnand,@function
isnand  = __isnan

        ENTRY(isnan)
        movl    8(%esp),%eax            / eax <-- hi_32(x)
        andl    $0x7fffffff,%eax        / eax <-- hi_32(abs(x))
        subl    $0x7ff00000,%eax        / weed out finite values
        jae     .nan_or_inf             / no jump if arg. is finite
        movl    $0,%eax                 / ansi needs (eax) = 0
        ret
.nan_or_inf:
        ja      .got_nan                / no jump if arg. may be infinite;
                                        / let nan waste time
                                        / (eax) = 0 here
        testl   $0xffffffff,4(%esp)     / ZF <-- 1 iff lo_frac. = 0
                                        /          iff arg. is infinite
        jnz     .got_nan                / no jump if arg. is infinite;
        ret
.got_nan:
        movl    $1,%eax                 / %eax was 0, must be made 1 to
                                        / indicate TRUE
        ret
        .align  4
        SET_SIZE(isnan)