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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>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
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 64-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 64-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 63 is returned.
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@param Operand The 64-bit operand to evaluate.
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@retval 0..63 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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HighBitSet64 (
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IN UINT64 Operand
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)
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{
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if (Operand == (UINT32)Operand) {
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//
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// Operand is just a 32-bit integer
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//
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return HighBitSet32 ((UINT32)Operand);
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}
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//
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// Operand is really a 64-bit integer
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//
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if (sizeof (UINTN) == sizeof (UINT32)) {
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return HighBitSet32 (((UINT32*)&Operand)[1]) + 32;
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} else {
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return HighBitSet32 ((UINT32)RShiftU64 (Operand, 32)) + 32;
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}
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}
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