; $Id$

;; @file

; innotek Portable Runtime - No-CRT ceill - 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.

;

; If you received this file as part of a commercial VirtualBox

; distribution, then only the terms of your commercial VirtualBox

; license agreement apply instead of the previous paragraph.

;

%include "iprt/asmdefs.mac"

BEGINCODE

%ifdef __AMD64__

%define _SP rsp

%define _BP rbp

%define _S 8

%else

%define _SP esp

%define _BP ebp

%define _S 4

%endif

;;

; Compute the smallest integral value not less than lrd.

; @returns st(0)

; @param lrd [rbp + 8]

BEGINPROC RT_NOCRT(ceill)

push _BP

mov _BP, _SP

sub _SP, 10h

fld tword [_BP + _S*2]

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

fstcw [_BP - 10h]

mov eax, [_BP - 10h]

or eax, 00800h

and eax, 0fbffh

mov [_BP - 08h], eax

fldcw [_BP - 08h]

; Round ST(0) to integer.

frndint

; Restore the fpu control word.

fldcw [_BP - 10h]

leave

ret

ENDPROC RT_NOCRT(ceill)