asin.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 "asin.s"
#include "libm.h"
LIBM_ANSI_PRAGMA_WEAK(asin,function)
#include "libm_synonyms.h"
#include "libm_protos.h"
#undef fabs
ENTRY(asin)
fldl 4(%esp) / push x
fld1 / push 1
fld %st(1) / x , 1 , x
fabs / |x| , 1 , x
fucomp
fstsw %ax
sahf
ja .ERR
fadd %st(1),%st / 1+x,x
fld1 / 1,1+x,x
fsub %st(2),%st / 1-x,1+x,x
fmulp %st,%st(1) / (1-x)*(1+x),x
fsqrt / sqrt((1-x)/(1+x)),x
fpatan / atan(x/sqrt((1-x)/(1+x)))
ret
.ERR:
/ |x| > 1
pushl %ebp
movl %esp,%ebp
PIC_SETUP(1)
fstp %st(0) / x
fstp %st(0) / empty NPX stack
pushl $2
pushl 12(%ebp) / high x
pushl 8(%ebp) / low x
pushl 12(%ebp) / high x
pushl 8(%ebp) / low x
call PIC_F(_SVID_libm_err) / report SVID result/error
addl $20,%esp
PIC_WRAPUP
leave
ret
.align 4
SET_SIZE(asin)