audk/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CompareMem.S

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#------------------------------------------------------------------------------
#
# 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 contain the same copy of this file:
#
# BaseMemoryLibRepStr
# BaseMemoryLibMmx
# BaseMemoryLibSse2
# BaseMemoryLibOptDxe
# BaseMemoryLibOptPei
#
#------------------------------------------------------------------------------
.globl _InternalMemCompareMem
#------------------------------------------------------------------------------
# INTN
# EFIAPI
# InternalMemCompareMem (
# IN CONST VOID *DestinationBuffer,
# IN CONST VOID *SourceBuffer,
# IN UINTN Length
# );
#------------------------------------------------------------------------------
_InternalMemCompareMem:
push %esi
push %edi
movl 12(%esp), %esi
movl 16(%esp), %edi
movl 20(%esp), %ecx
repe cmpsb
movzbl -1(%esi), %eax
movzbl -1(%edi), %edx
subl %edx, %eax
pop %edi
pop %esi
ret