mirror of https://github.com/acidanthera/audk.git
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
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/** @file
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Math worker functions.
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Copyright (c) 2006, Intel Corporation<BR>
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All rights reserved. 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 << HighBitSet64(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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INTN BitPos;
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return (BitPos = HighBitSet64 (Operand)) > 0 ? LShiftU64 (1, BitPos) : 0;
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}
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