a58b9d96b4
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10781 6f19259b-4bc3-4df7-8a09-765794883524
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/** @file
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Math worker functions.
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "BaseLibInternals.h"
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/**
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Returns the value of the highest bit set in a 64-bit value. Equivalent to
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1 << log2(x).
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This function computes the value of the highest bit set in the 64-bit value
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specified by Operand. If Operand is zero, then zero is returned.
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@param Operand The 64-bit operand to evaluate.
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@return 1 << HighBitSet64(Operand)
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@retval 0 Operand is zero.
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**/
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UINT64
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EFIAPI
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GetPowerOfTwo64 (
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IN UINT64 Operand
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)
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{
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if (Operand == 0) {
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return 0;
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}
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return LShiftU64 (1, (UINTN) HighBitSet64 (Operand));
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}
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