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 ; OUT VOID *DestinationBuffer,
31 ; IN CONST VOID *SourceBuffer,
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 <- End of Source
40 mov rax, rdi ; rax <- Destination as return value
43 jae @CopyBackward ; Copy backward if overlapped
47 shr rcx, 3 ; rcx <- # of Qwords to copy
49 DB 49h, 0fh, 7eh, 0c2h ; movd r10, mm0 (Save mm0 in r10)
51 DB 0fh, 6fh, 06h ; movd mm0, [rsi]
52 DB 0fh, 0e7h, 07h ; movntq [rdi], mm0
57 DB 49h, 0fh, 6eh, 0c2h ; movd mm0, r10 (Restore mm0)
60 mov rsi, r9 ; rsi <- End of Source
61 lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination
62 std ; set direction flag
65 rep movsb ; Copy bytes backward
68 InternalMemCopyMem ENDP