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diff --git a/MdePkg/Library/BaseLib/Ia32/LShiftU64.S b/MdePkg/Library/BaseLib/Ia32/LShiftU64.S
new file mode 100644
index 0000000000..4aa17c637d
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/LShiftU64.S
@@ -0,0 +1,36 @@
+#------------------------------------------------------------------------------
+#
+# 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:
+#
+#   LShiftU64.asm
+#
+# Abstract:
+#
+#   64-bit left shift function for IA-32
+#
+#------------------------------------------------------------------------------
+
+    .686: 
+    #.MODEL flat,C
+    .code: 
+
+.global _InternalMathLShiftU64
+_InternalMathLShiftU64:
+    movb    12(%esp), %cl
+    xorl    %eax, %eax
+    movl    4(%esp), %edx
+    testb   $32, %cl
+    cmovz   %edx, %eax
+    cmovz   0x8(%esp), %edx
+    shld    %cl,%eax,%edx
+    shl     %cl, %eax
+    ret