Initial import.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/LowBitSet32.c

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+/** @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 lowest bit set in a 32-bit value.
+
+  This function computes the bit position of the lowest 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 lowest bit set in Operand if found.
+  @retval -1 Operand is zero.
+
+**/
+INTN
+EFIAPI
+LowBitSet32 (
+  IN      UINT32                    Operand
+  )
+{
+  INTN                              BitIndex;
+
+  if (Operand == 0) {
+    return -1;
+  }
+
+  for (BitIndex = 0; (Operand & 1) == 0; BitIndex++, Operand >>= 1);
+  return BitIndex;
+}