1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 ; 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. 8 ; 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. 11 ; 12 ; Module Name: 13 ; 14 ; CompareMem.Asm 15 ; 16 ; Abstract: 17 ; 18 ; CompareMem function 19 ; 20 ; Notes: 21 ; 22 ; The following BaseMemoryLib instances contain the same copy of this file: 23 ; 24 ; BaseMemoryLibRepStr 25 ; BaseMemoryLibMmx 26 ; BaseMemoryLibSse2 27 ; BaseMemoryLibOptDxe 28 ; BaseMemoryLibOptPei 29 ; 30 ;------------------------------------------------------------------------------ 31 32 .code 33 34 ;------------------------------------------------------------------------------ 35 ; INTN 36 ; EFIAPI 37 ; InternalMemCompareMem ( 38 ; IN CONST VOID *DestinationBuffer, 39 ; IN CONST VOID *SourceBuffer, 40 ; IN UINTN Length 41 ; ); 42 ;------------------------------------------------------------------------------ 43 InternalMemCompareMem PROC USES rsi rdi 44 mov rsi, rcx 45 mov rdi, rdx 46 mov rcx, r8 47 repe cmpsb 48 movzx rax, byte ptr [rsi - 1] 49 movzx rdx, byte ptr [rdi - 1] 50 sub rax, rdx 51 ret 52 InternalMemCompareMem ENDP 53 54 END 55
