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41 lines
1.8 KiB
C++
41 lines
1.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2020 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_POPCOUNT_H
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#define INCLUDE_POPCOUNT_H
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// Population count - count number of bits
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#if defined(__cplusplus) && (__cplusplus >= 202002L)
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#include <bit>
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#define popcount std::popcount
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#elif defined (__GNUC__)
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#define popcount __builtin_popcount
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#elif defined(_MSC_VER)
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#include <intrin.h>
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#define popcount __popcnt
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#else
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static int popcount(int in)
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{
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int cnt = 0;
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for(int i = 0; i < 32; i++)
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cnt += (in >> i) & 1;
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return cnt;
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}
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#endif
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#endif /* INCLUDE_POPCOUNT_H */
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