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diff --git a/MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.s b/MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.s
new file mode 100644
index 0000000000..00f6d74436
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.s
@@ -0,0 +1,53 @@
+#------------------------------------------------------------------------------
+#
+# 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:
+#
+#   ScanMem64.Asm
+#
+# Abstract:
+#
+#   ScanMem64 function
+#
+# Notes:
+#
+#   The following BaseMemoryLib instances share the same version of this file:
+#
+#       BaseMemoryLibRepStr
+#       BaseMemoryLibMmx
+#       BaseMemoryLibSse2
+#
+#------------------------------------------------------------------------------
+
+    .686: 
+    #.MODEL flat,C
+    .code: 
+
+.global _InternalMemScanMem64
+_InternalMemScanMem64:
+    push    %edi
+    movl    12(%esp), %ecx
+    movl    16(%esp), %eax
+    movl    20(%esp), %edx
+    movl    8(%esp), %edi
+L0: 
+    cmpl    (%edi), %eax
+    leal    8(%edi), %edi
+    loopne  L0
+    jne     L1
+    cmpl    -4(%edi), %edx
+    jecxz   L1
+    jne     L0
+L1: 
+    leal    -8(%edi), %eax
+    cmovne  %ecx, %eax
+    pop     %edi
+    ret