EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c

   1 /*++
   2
   3 Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>
   4 This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   GetPowerOfTwo32.c
  15
  16 Abstract:
  17
  18   Math worker functions.
  19
  20 --*/
  21
  22 #include "BaseLibInternals.h"
  23
  24 /**
  25   Returns the value of the highest bit set in a 32-bit value. Equivalent to
  26   1 << HighBitSet32(x).
  27
  28   This function computes the value of the highest bit set in the 32-bit value
  29   specified by Operand. If Operand is zero, then zero is returned.
  30
  31   @param  Operand The 32-bit operand to evaluate.
  32
  33   @return 1 << HighBitSet32(Operand)
  34   @retval 0 Operand is zero.
  35
  36 **/
  37 UINT32
  38 EFIAPI
  39 GetPowerOfTwo32 (
  40   IN      UINT32                    Operand
  41   )
  42 {
  43   if (Operand == 0) {
  44     return 0;
  45   }
  46
  47   return 1ul << HighBitSet32 (Operand);
  48 }