copysign.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 "copysign.s"
#include "libm.h"
LIBM_ANSI_PRAGMA_WEAK(copysign,function)
ENTRY(copysign)
movl 8(%esp),%eax / eax <-- hi_32(x)
movl 16(%esp),%ecx / ecx <-- hi_32(y)
andl $0x7fffffff,%eax / eax <-- hi_32(abs(x))
andl $0x80000000,%ecx / ecx[31] <-- sign_bit(y)
orl %ecx,%eax / eax <-- hi_32(copysign(x,y))
movl 4(%esp),%ecx / ecx <-- lo_32(x)
/ = lo_32(copysign(x,y))
subl $8,%esp / set up loading dock for result
movl %ecx,(%esp) / copy lo_32(result) to loading dock
movl %eax,4(%esp) / copy hi_32(result) to loading dock
fldl (%esp) / load copysign(x,y)
fwait / in case fldl causes exception
addl $8,%esp / restore stack-pointer for return
ret
.align 4
SET_SIZE(copysign)