; $Id: remainder.asm 8256 2008-04-21 20:53:28Z vboxsync $
;; @file
; IPRT - No-CRT remainder - AMD64 & X86.
;

;
; Copyright (C) 2006-2007 Sun Microsystems, Inc.
;
; 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.
;
; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
; Clara, CA 95054 USA or visit http://www.sun.com if you need
; additional information or have any questions.
;

%include "iprt/asmdefs.mac"

BEGINCODE

%ifdef RT_ARCH_AMD64
 %define _SP rsp
 %define _BP rbp
%else
 %define _SP esp
 %define _BP ebp
%endif

;;
; See SUS.
; @returns st(0)
; @param    rd1    [ebp + 8h]  xmm0
; @param    rd2    [ebp + 10h]  xmm1
BEGINPROC RT_NOCRT(remainder)
    push    _BP
    mov     _BP, _SP
    sub     _SP, 20h
;int3

%ifdef RT_ARCH_AMD64
    movsd   [rsp + 10h], xmm1
    movsd   [rsp], xmm0
    fld     qword [rsp + 10h]
    fld     qword [rsp]
%else
    fld     qword [ebp + 10h]
    fld     qword [ebp + 8h]
%endif

    fprem1
    fstsw   ax
    test    ah, 04h
    jnz     .done
    fstp    st1

.done:
%ifdef RT_ARCH_AMD64
    fstp    qword [rsp]
    movsd   xmm0, [rsp]
%endif

    leave
    ret
ENDPROC   RT_NOCRT(remainder)