1 ;------------------------------------------------------------------------------
3 ; Copyright (c) 2007, 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 ;------------------------------------------------------------------------------
29 ;------------------------------------------------------------------------------
32 ; IN VOID *Destination,
36 ;------------------------------------------------------------------------------
37 memcpy PROC USES esi edi
38 mov esi, [esp + 16] ; esi <- Source
39 mov edi, [esp + 12] ; edi <- Destination
40 mov edx, [esp + 20] ; edx <- Count
41 lea eax, [esi + edx - 1] ; eax <- End of Source
48 cmp eax, edi ; Overlapped?
49 jae @CopyBackward ; Copy backward if overlapped
53 and ecx, 15 ; ecx + edi aligns on 16-byte boundary
57 sub edx, ecx ; edx <- remaining bytes to copy
62 shr ecx, 4 ; ecx <- # of DQwords to copy
66 movdqu xmm0, [esi] ; esi may not be 16-bytes aligned
67 movdqa [edi], xmm0 ; edi should be 16-bytes aligned
71 add esp, 16 ; stack cleanup
74 mov esi, eax ; esi <- Last byte in Source
75 lea edi, [edi + edx - 1] ; edi <- Last byte in Destination