Add S assembler file for BaseMemoryLibOptDxe driver.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6201 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.S

@@ -0,0 +1,60 @@
+#
+# ConvertAsm.py: Automatically generated from CompareMem.asm
+#
+#------------------------------------------------------------------------------
+#
+# 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.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
+#   );
+#------------------------------------------------------------------------------
+.intel_syntax noprefix
+.globl ASM_PFX(InternalMemCompareMem)
+ASM_PFX(InternalMemCompareMem):
+    push    rsi
+    push    rdi
+    mov     rsi, rcx
+    mov     rdi, rdx
+    mov     rcx, r8
+    repe    cmpsb
+    movzx   rax, byte ptr [rsi - 1]
+    movzx   rdx, byte ptr [rdi - 1]
+    sub     rax, rdx
+    pop     rdi
+    pop     rsi
+    ret
+