MdePkg/Library/BaseMemoryLibRepStr/Ia32/CompareMem.asm

   1 //
   2 // Include common header file for this module.
   3 //
   4 #include "CommonHeader.h"
   5
   6 ;------------------------------------------------------------------------------
   7 ;
   8 ; Copyright (c) 2006, Intel Corporation
   9 ; All rights reserved. This program and the accompanying materials
  10 ; are licensed and made available under the terms and conditions of the BSD License
  11 ; which accompanies this distribution.  The full text of the license may be found at
  12 ; http://opensource.org/licenses/bsd-license.php
  13 ;
  14 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16 ;
  17 ; Module Name:
  18 ;
  19 ;   CompareMem.Asm
  20 ;
  21 ; Abstract:
  22 ;
  23 ;   CompareMem function
  24 ;
  25 ; Notes:
  26 ;
  27 ;   The following BaseMemoryLib instances share the same version of this file:
  28 ;
  29 ;       BaseMemoryLibRepStr
  30 ;       BaseMemoryLibMmx
  31 ;       BaseMemoryLibSse2
  32 ;
  33 ;------------------------------------------------------------------------------
  34
  35     .686
  36     .model  flat,C
  37     .code
  38
  39 ;------------------------------------------------------------------------------
  40 ; INTN
  41 ; EFIAPI
  42 ; InternalMemCompareMem (
  43 ;   IN      CONST VOID                *DestinationBuffer,
  44 ;   IN      CONST VOID                *SourceBuffer,
  45 ;   IN      UINTN                     Length
  46 ;   );
  47 ;------------------------------------------------------------------------------
  48 InternalMemCompareMem   PROC    USES    esi edi
  49     mov     esi, [esp + 12]
  50     mov     edi, [esp + 16]
  51     mov     ecx, [esp + 20]
  52     repe    cmpsb
  53     movzx   eax, byte ptr [esi - 1]
  54     movzx   edx, byte ptr [edi - 1]
  55     sub     eax, edx
  56     ret
  57 InternalMemCompareMem   ENDP
  58
  59     END