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diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem16.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem16.nasm
new file mode 100644
index 000000000..bcf15ad38
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+++ b/roms/edk2/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem16.nasm
@@ -0,0 +1,41 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; SetMem16.Asm
+;
+; Abstract:
+;
+; SetMem16 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem16 (
+; IN VOID *Buffer,
+; IN UINTN Count,
+; IN UINT16 Value
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem16)
+ASM_PFX(InternalMemSetMem16):
+ push rdi
+ push rcx
+ mov rdi, rcx
+ mov rax, r8
+ xchg rcx, rdx
+ rep stosw
+ pop rax
+ pop rdi
+ ret
+