audk/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.asm

46 lines
1.2 KiB
NASM

;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation
; All rights reserved. This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
; CompareMem.Asm
;
; Abstract:
;
; CompareMem function
;
; Notes:
;
; The following BaseMemoryLib instances share the same version of this file:
;
; BaseMemoryLibRepStr
; BaseMemoryLibMmx
; BaseMemoryLibSse2
;
;------------------------------------------------------------------------------
.686
.model flat,C
.code
InternalMemCompareMem PROC USES esi edi
mov esi, [esp + 12]
mov edi, [esp + 16]
mov ecx, [esp + 20]
repe cmpsb
movzx eax, byte ptr [esi - 1]
movzx edx, byte ptr [edi - 1]
sub eax, edx
ret
InternalMemCompareMem ENDP
END