MdePkg/Library/BaseMemoryLibRepStr/X64/CompareMem.S File Reference
Detailed Description
#
# ConvertAsm.py: Automatically generated from
CompareMem.asm
#
#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2009, 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.S
#
# Abstract:
#
# CompareMem function
#
# Notes:
#
# The following BaseMemoryLib instances contain the same copy of this file:
#
# BaseMemoryLibRepStr
# BaseMemoryLibMmx
# BaseMemoryLibSse2
# BaseMemoryLibOptDxe
# BaseMemoryLibOptPei
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# INTN
# EFIAPI
# InternalMemCompareMem (
# IN CONST VOID *DestinationBuffer,
# IN CONST VOID *SourceBuffer,
# IN UINTN Length
# );
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMemCompareMem)
ASM_PFX(InternalMemCompareMem):
pushq rsi
pushq rdi
movq rcx, rsi
movq rdx, rdi
movq r8, rcx
repe cmpsb
movzbq -1(rsi) , rax
movzbq -1(rdi) , rdx
subq rdx, rax
popq rdi
popq rsi
ret