MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S

   1 #
   2 # ConvertAsm.py: Automatically generated from CompareMem.asm
   3 #
   4 #------------------------------------------------------------------------------
   5 #
   6 # Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   7 # 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 ASM_GLOBAL ASM_PFX(InternalMemCompareMem)
  46 ASM_PFX(InternalMemCompareMem):
  47     pushq   %rsi
  48     pushq   %rdi
  49     movq    %rcx, %rsi
  50     movq    %rdx, %rdi
  51     movq    %r8, %rcx
  52     repe    cmpsb
  53     movzbq  -1(%rsi), %rax
  54     movzbq  -1(%rdi), %rdx
  55     subq    %rdx, %rax
  56     popq    %rdi
  57     popq    %rsi
  58     ret
  59