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43 lines
1.9 KiB
C++
43 lines
1.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2022 Jon Beniston, M7RCE //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_POWEROFTWO_H
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#define INCLUDE_POWEROFTWO_H
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#include <cstdint>
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// Is x a power of two
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// From: https://stackoverflow.com/questions/600293/how-to-check-if-a-number-is-a-power-of-2
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inline bool isPowerOfTwo(uint32_t x)
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{
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return (x & (x - 1)) == 0;
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}
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// Calculate next power of 2 lower than x
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// From: https://stackoverflow.com/questions/2679815/previous-power-of-2
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inline uint32_t lowerPowerOfTwo(uint32_t x)
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{
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x = x | (x >> 1);
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x = x | (x >> 2);
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x = x | (x >> 4);
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x = x | (x >> 8);
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x = x | (x >> 16);
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return x - (x >> 1);
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}
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#endif /* INCLUDE_POWEROFTWO_H */
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