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 InternalMemCopyMem PROC USES rsi rdi
27 mov rsi, rdx ; rsi <- Source
28 mov rdi, rcx ; rdi <- Destination
29 lea r9, [rdi + r8 - 1] ; r9 <- End of Destination
31 mov rax, rdi ; rax <- Destination as return value
34 jae @CopyBackward ; Copy backward if overlapped
38 and rcx, 7 ; rcx + rsi aligns on 8-byte boundary
42 sub r8, rcx ; r8 <- remaining bytes to copy
47 shr rcx, 3 ; rcx <- # of Qwords to copy
49 DB 49h, 0fh, 7eh, 0c2h ; movq r10, mm0 ; save mm0
51 DB 48h, 0fh, 6fh, 06h ; movq mm0, [rsi]
52 DB 48h, 0fh, 0e7h, 07h ; movntq [rdi], mm0
57 DB 49h, 0fh, 6eh, 0c2h ; movq mm0, r10 ; restore mm0
60 mov rdi, r9 ; rdi <- End of Destination
61 lea rsi, [rsi + r8 - 1] ; rsi <- End of Source
62 std ; set direction flag
65 rep movsb ; Copy bytes backward
68 InternalMemCopyMem ENDP