1 files changed, 41 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/HighBitSet32.c b/MdePkg/Library/BaseLib/HighBitSet32.c
new file mode 100644
index 0000000000..65f067ac1a
--- /dev/null
+++ b/MdePkg/Library/BaseLib/HighBitSet32.c
@@ -0,0 +1,41 @@
+/** @file
+  Math worker functions.
+
+  Copyright (c) 2006, Intel Corporation<BR>
+  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.
+
+**/
+
+#include "BaseLibInternals.h"
+
+/**
+  Returns the bit position of the highest bit set in a 32-bit value. Equivalent
+  to log2(x).
+
+  This function computes the bit position of the highest bit set in the 32-bit
+  value specified by Operand. If Operand is zero, then -1 is returned.
+  Otherwise, a value between 0 and 31 is returned.
+
+  @param  Operand The 32-bit operand to evaluate.
+
+  @return Position of the highest bit set in Operand if found.
+  @retval -1  Operand is zero.
+
+**/
+INTN
+EFIAPI
+HighBitSet32 (
+  IN      UINT32                    Operand
+  )
+{
+  INTN                              BitIndex;
+
+  for (BitIndex = -1; Operand != 0; BitIndex++, Operand >>= 1);
+  return BitIndex;
+}