; $Id: cosl.asm $
;; @file
; IPRT - No-CRT cosl - AMD64 & X86.
;

;
; Copyright (C) 2006-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program 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 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;

%include "iprt/asmdefs.mac"

BEGINCODE

;;
; compute the cosine of ldr, measured in radians.
; @returns st(0)
; @param    lrd     [rbp + xCB*2]
RT_NOCRT_BEGINPROC cosl
    push    xBP
    mov     xBP, xSP
    sub     xSP, 10h

    fld     tword [xBP + xCB*2]
    fcos
    fnstsw  ax
    test    ah, 4
    jz      .done

    fldpi
    fadd    st0, st0
    fxch    st1
.again:
    fprem1
    fnstsw  ax
    test    ah, 4
    jnz     .again

    fstp    st0
    fcos

.done:
    leave
    ret
ENDPROC   RT_NOCRT(cosl)