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9344f09215
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
42 lines
955 B
C
42 lines
955 B
C
/** @file
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Math worker functions.
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "BaseLibInternals.h"
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/**
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Returns the bit position of the highest bit set in a 32-bit value. Equivalent
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to log2(x).
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This function computes the bit position of the highest bit set in the 32-bit
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value specified by Operand. If Operand is zero, then -1 is returned.
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Otherwise, a value between 0 and 31 is returned.
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@param Operand The 32-bit operand to evaluate.
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@retval 0..31 Position of the highest bit set in Operand if found.
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@retval -1 Operand is zero.
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**/
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INTN
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EFIAPI
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HighBitSet32 (
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IN UINT32 Operand
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)
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{
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INTN BitIndex;
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if (Operand == 0) {
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return - 1;
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}
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for (BitIndex = 31; (INT32)Operand > 0; BitIndex--, Operand <<= 1);
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return BitIndex;
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}
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