atan2.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 "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)