; $Id$

;; @file

; innotek Portable Runtime - No-CRT tanl - AMD64 & X86.

;

;

; Copyright (C) 2006-2007 innotek GmbH

;

; This file is part of VirtualBox Open Source Edition (OSE), as

; available from http://www.virtualbox.org. This file is free software;

; you can redistribute it and/or modify it under the terms of the GNU

; General Public License as published by the Free Software Foundation,

; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE

; distribution. VirtualBox OSE is distributed in the hope that it will

; be useful, but WITHOUT ANY WARRANTY of any kind.

%include "iprt/asmdefs.mac"

BEGINCODE

%ifdef RT_ARCH_AMD64

%define _SP rsp

%define _BP rbp

%define _S 8

%else

%define _SP esp

%define _BP ebp

%define _S 4

%endif

;;

; Compute the sine of lrd

; @returns st(0)

; @param lrd [_SP + _S*2]

BEGINPROC RT_NOCRT(tanl)

push _BP

mov _BP, _SP

sub _SP, 10h

fld tword [_BP + _S*2]

fptan

fnstsw ax

test ah, 04h ; check for C2

jz .done

fldpi

fadd st0

fxch st1

.again:

fprem1

fnstsw ax

test ah, 04h

jnz .again

fstp st1

fptan

.done:

fstp st0

leave

ret

ENDPROC RT_NOCRT(tanl)