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diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem16.nasm b/MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem16.nasm
new file mode 100644
index 0000000000..b6df0c845e
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem16.nasm
@@ -0,0 +1,55 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; 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:
+;
+;   ScanMem16.Asm
+;
+; Abstract:
+;
+;   ScanMem16 function
+;
+; Notes:
+;
+;   The following BaseMemoryLib instances contain the same copy of this file:
+;
+;       BaseMemoryLibRepStr
+;       BaseMemoryLibMmx
+;       BaseMemoryLibSse2
+;       BaseMemoryLibOptDxe
+;       BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem16 (
+;   IN      CONST VOID                *Buffer,
+;   IN      UINTN                     Length,
+;   IN      UINT16                    Value
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem16)
+ASM_PFX(InternalMemScanMem16):
+    push    rdi
+    mov     rdi, rcx
+    mov     rax, r8
+    mov     rcx, rdx
+    repne   scasw
+    lea     rax, [rdi - 2]
+    cmovnz  rax, rcx
+    pop     rdi
+    ret
+