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; $Id: __U8RS.asm $
;; @file
; Compiler support routines.
;
;
; Copyright (C) 2012-2023 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>.
;
; SPDX-License-Identifier: GPL-3.0-only
;
;*******************************************************************************
;* Exported Symbols *
;*******************************************************************************
public __U8RS
.8086
_TEXT segment public 'CODE' use16
assume cs:_TEXT
;;
; 64-bit unsigned right shift.
;
; @param ax:bx:cx:dx Value. (AX is the most significant, DX the least)
; @param si Shift count.
; @returns ax:bx:cx:dx Shifted value.
; si is zeroed
;
__U8RS:
test si, si
jz u8rs_quit
u8rs_rot:
shr ax, 1
rcr bx, 1
rcr cx, 1
rcr dx, 1
dec si
jnz u8rs_rot
u8rs_quit:
ret
_TEXT ends
end
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