MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S

   1 #
   2 # ConvertAsm.py: Automatically generated from CompareMem.asm
   3 #
   4 #------------------------------------------------------------------------------
   5 #
   6 # Copyright (c) 2006 - 2008, Intel Corporation
   7 # All rights reserved. This program and the accompanying materials
   8 # are licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 # Module Name:
  16 #
  17 #   CompareMem.S
  18 #
  19 # Abstract:
  20 #
  21 #   CompareMem function
  22 #
  23 # Notes:
  24 #
  25 #   The following BaseMemoryLib instances contain the same copy of this file:
  26 #
  27 #       BaseMemoryLibRepStr
  28 #       BaseMemoryLibMmx
  29 #       BaseMemoryLibSse2
  30 #       BaseMemoryLibOptDxe
  31 #       BaseMemoryLibOptPei
  32 #
  33 #------------------------------------------------------------------------------
  34
  35
  36 #------------------------------------------------------------------------------
  37 # INTN
  38 # EFIAPI
  39 # InternalMemCompareMem (
  40 #   IN      CONST VOID                *DestinationBuffer,
  41 #   IN      CONST VOID                *SourceBuffer,
  42 #   IN      UINTN                     Length
  43 #   );
  44 #------------------------------------------------------------------------------
  45 .intel_syntax noprefix
  46 .globl ASM_PFX(InternalMemCompareMem)
  47 ASM_PFX(InternalMemCompareMem):
  48     push    rsi
  49     push    rdi
  50     mov     rsi, rcx
  51     mov     rdi, rdx
  52     mov     rcx, r8
  53     repe    cmpsb
  54     movzx   rax, byte ptr [rsi - 1]
  55     movzx   rdx, byte ptr [rdi - 1]
  56     sub     rax, rdx
  57     pop     rdi
  58     pop     rsi
  59     ret
  60