; $Id: cosf.asm 96060 2022-08-05 12:22:06Z vboxsync $
;; @file
; IPRT - No-CRT cosf - AMD64 & X86.
;

;
; Copyright (C) 2006-2022 Oracle Corporation
;
; 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 (GPL) 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.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE 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.
;

%include "iprt/asmdefs.mac"

BEGINCODE

;;
; compute the cosine of r32, measured in radians.
; @returns st(0) / xmm0
; @param    r32     [rbp + xCB*2] / xmm0
RT_NOCRT_BEGINPROC cosf
    push    xBP
    mov     xBP, xSP
%ifdef RT_ARCH_AMD64
    sub     xSP, 10h

    movss   [xSP], xmm0
    fld     dword [xSP]
%else
    fld     dword [xBP + xCB*2]
%endif
    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:
%ifdef RT_ARCH_AMD64
    fstp    dword [xSP]
    movss   xmm0, [xSP]
%endif
    leave
    ret
ENDPROC   RT_NOCRT(cosf)