/*
 * 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 "atan2.s"

#include "libm.h"
LIBM_ANSI_PRAGMA_WEAK(atan2,function)
#include "libm_protos.h"

        ENTRY(atan2)
        movl    4(%esp),%eax            / low part of y
        movl    12(%esp),%ecx           / low part of x
        orl     %eax,%ecx
        jz      .maybe_0s

        / not both x and y are 0's
1:
        fldl    4(%esp)                 / push y
        fldl    12(%esp)                / push x
        fpatan                          / return atan2(y,x)
        ret

.maybe_0s:
        movl    8(%esp),%eax            / high part of y
        movl    16(%esp),%ecx           / high part of x
        orl     %eax,%ecx
        andl    $0x7fffffff,%ecx        / clear sign
        jnz     1b
        / both x and y are 0's
        pushl   %ebp
        movl    %esp,%ebp
        PIC_SETUP(1)
        pushl   $3
        pushl   12(%ebp)                / high y
        pushl   8(%ebp)                 / low y
        pushl   20(%ebp)                / high x
        pushl   16(%ebp)                / low x
        call    PIC_F(_SVID_libm_err)   / report SVID result/error
        addl    $20,%esp
        PIC_WRAPUP
        leave
        ret
        .align  4
        SET_SIZE(atan2)