1 ;------------------------------------------------------------------------------
3 ; Copyright (c) 2006, Intel Corporation
4 ; All rights reserved. This program and the accompanying materials
5 ; are licensed and made available under the terms and conditions of the BSD License
6 ; which accompanies this distribution. The full text of the license may be found at
7 ; http://opensource.org/licenses/bsd-license.php
9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
22 ;------------------------------------------------------------------------------
26 ;------------------------------------------------------------------------------
29 ; InternalMemCopyMem (
30 ; IN VOID *Destination,
34 ;------------------------------------------------------------------------------
35 InternalMemCopyMem PROC USES rsi rdi
36 mov rsi, rdx ; rsi <- Source
37 mov rdi, rcx ; rdi <- Destination
38 lea r9, [rsi + r8 - 1] ; r9 <- Last byte of Source
40 mov rax, rdi ; rax <- Destination as return value
41 jae @F ; Copy forward if Source > Destination
42 cmp r9, rdi ; Overlapped?
43 jae @CopyBackward ; Copy backward if overlapped
46 sub rcx, rdi ; rcx <- -rdi
47 and rcx, 15 ; rcx + rsi should be 16 bytes aligned
48 jz @F ; skip if rcx == 0
56 shr rcx, 4 ; rcx <- # of DQwords to copy
58 movdqa [rsp + 18h], xmm0 ; save xmm0 on stack
60 movdqu xmm0, [rsi] ; rsi may not be 16-byte aligned
61 movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
66 movdqa xmm0, [rsp + 18h] ; restore xmm0
67 jmp @CopyBytes ; copy remaining bytes
69 mov rsi, r9 ; rsi <- Last byte of Source
70 lea rdi, [rdi + r8 - 1] ; rdi <- Last byte of Destination
77 InternalMemCopyMem ENDP