; $Id$

;; @file

; IPRT - No-CRT trunc - AMD64 & X86.

;

;

; Copyright (C) 2006-2007 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

;;

; Round to truncated integer value.

; @returns 32-bit: st(0) 64-bit: xmm0

; @param rd 32-bit: [ebp + 8] 64-bit: xmm0

BEGINPROC RT_NOCRT(trunc)

push xBP

mov xBP, xSP

sub xSP, 10h

%ifdef RT_ARCH_AMD64

movsd [xSP], xmm0

fld qword [xSP]

%else

fld qword [xBP + xS*2]

%endif

; Make it truncate up by modifying the fpu control word.

fstcw [xBP - 10h]

mov eax, [xBP - 10h]

or eax, 00c00h

mov [xBP - 08h], eax

fldcw [xBP - 08h]

; Round ST(0) to integer.

frndint

; Restore the fpu control word.

fldcw [xBP - 10h]

%ifdef RT_ARCH_AMD64

fstp qword [xSP]

movsd xmm0, [xSP]

%endif

leave

ret

ENDPROC RT_NOCRT(trunc)