; $Id$

;; @file

; innotek Portable Runtime - No-CRT mempcpy - 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

;;

; @param pvDst gcc: rdi msc: rcx x86:[esp+4]

; @param pvSrc gcc: rsi msc: rdx x86:[esp+8]

; @param cb gcc: rdx msc: r8 x86:[esp+0ch]

BEGINPROC RT_NOCRT(mempcpy)

cld ; paranoia

; Do the bulk of the work.

%ifdef __AMD64__

%ifdef ASM_CALL64_MSC

mov r10, rdi ; save

mov r11, rsi ; save

mov rdi, rcx

mov rsi, rdx

mov rcx, r8

mov rdx, r8

%else

mov rcx, rdx

%endif

shr rcx, 3

rep movsq

%else

mov eax, edi ; saving edi in eax

push esi

mov ecx, [esp + 0ch + 4]

mov edi, [esp + 04h + 4]

mov esi, [esp + 08h + 4]

mov edx, ecx

shr ecx, 2

rep movsd

%endif

; The remaining bytes.

%ifdef __AMD64__

test dl, 4

jz .dont_move_dword

movsd

%endif

.dont_move_dword:

test dl, 2

jz .dont_move_word

movsw

.dont_move_word:

test dl, 1

jz .dont_move_byte

movsb

.dont_move_byte:

; restore & return

%ifdef __AMD64__

mov rax, rdi

%ifdef ASM_CALL64_MSC

mov rsi, r11

mov rdi, r10

%endif

%else

pop esi

xchg eax, edi

%endif

ret

ENDPROC RT_NOCRT(mempcpy)