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diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.c b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.c
deleted file mode 100644
index 5c2a3ea2b4..0000000000
--- a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.c
+++ /dev/null
@@ -1,96 +0,0 @@
-/** @file
-  Compiler intrinsic to return the number of leading zeros, ported from LLVM code.
-
-  Copyright (c) 2008 - 2009, Apple Inc. 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.
-
-**/
-/**
-  University of Illinois/NCSA
-  Open Source License
-
-  Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign.
-  All rights reserved.
-
-  Developed by:
-
-      LLVM Team
-
-      University of Illinois at Urbana-Champaign
-
-      http://llvm.org
-
-  Permission is hereby granted, free of charge, to any person obtaining a copy of
-  this software and associated documentation files (the "Software"), to deal with
-  the Software without restriction, including without limitation the rights to
-  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-  of the Software, and to permit persons to whom the Software is furnished to do
-  so, subject to the following conditions:
-
-      * Redistributions of source code must retain the above copyright notice,
-        this list of conditions and the following disclaimers.
-
-      * Redistributions in binary form must reproduce the above copyright notice,
-        this list of conditions and the following disclaimers in the
-        documentation and/or other materials provided with the distribution.
-
-      * Neither the names of the LLVM Team, University of Illinois at
-        Urbana-Champaign, nor the names of its contributors may be used to
-        endorse or promote products derived from this Software without specific
-        prior written permission.
-
-  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-  CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
-  SOFTWARE.
-**/
-
-
-#include "Llvm_int_lib.h"
-
-// Returns: the number of leading 0-bits
-
-// Precondition: a != 0
-
-INT32
-__clzsi2(INT32 a)
-{
-    UINT32 x = (UINT32)a;
-    INT32 t = ((x & 0xFFFF0000) == 0) << 4;  // if (x is small) t = 16 else 0
-    x >>= 16 - t;      // x = [0 - 0xFFFF]
-    UINT32 r = t;       // r = [0, 16]
-    // return r + clz(x)
-    t = ((x & 0xFF00) == 0) << 3;
-    x >>= 8 - t;       // x = [0 - 0xFF]
-    r += t;            // r = [0, 8, 16, 24]
-    // return r + clz(x)
-    t = ((x & 0xF0) == 0) << 2;
-    x >>= 4 - t;       // x = [0 - 0xF]
-    r += t;            // r = [0, 4, 8, 12, 16, 20, 24, 28]
-    // return r + clz(x)
-    t = ((x & 0xC) == 0) << 1;
-    x >>= 2 - t;       // x = [0 - 3]
-    r += t;            // r = [0 - 30] and is even
-    // return r + clz(x)
-//     switch (x)
-//     {
-//     case 0:
-//         return r + 2;
-//     case 1:
-//         return r + 1;
-//     case 2:
-//     case 3:
-//         return r;
-//     }
-    return r + ((2 - x) & -((x & 2) == 0));
-}