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77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/Bitwise.h
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Copyright (C) 2016
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Author: Guido Cossu <guido.cossu@ed.ac.uk>
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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; either version 2 of the License, or
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(at your option) any later version.
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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 for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution
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directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef GRID_BITWISE_H
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#define GRID_BITWISE_H
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#include <cassert>
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#include <cfloat>
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#include <bitset>
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#include <climits>
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#include <Config.h>
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#ifdef GRID_DEFAULT_PRECISION_SINGLE
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#define GRID_REAL_BYTES 4
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#endif
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#ifdef GRID_DEFAULT_PRECISION_DOUBLE
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#define GRID_REAL_BYTES 8
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#endif
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namespace Grid {
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void show_binaryrep(const unsigned char* a, size_t size);
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template <typename T>
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void show_binaryrep(const T& a) {
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const char* beg = reinterpret_cast<const char*>(&a);
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const char* end = beg + sizeof(a);
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unsigned int ctr = 0;
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while (beg != end) {
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std::cout << std::bitset<CHAR_BIT>(*beg++) << ' ';
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ctr++;
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if (ctr % GRID_REAL_BYTES == 0) std::cout << '\n';
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}
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std::cout << '\n';
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}
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template <typename T>
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void bitwise_xor(T& l, T& r, unsigned char* xors) {
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assert(sizeof(l) == sizeof(r));
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unsigned char* org = reinterpret_cast<unsigned char*>(&l);
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unsigned char* cur = reinterpret_cast<unsigned char*>(&r);
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int words = sizeof(l) / sizeof(*org);
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unsigned char result = 0;
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for (int w = 0; w < words; w++) xors[w] = (org[w] ^ cur[w]);
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}
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}; // namespace
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#endif
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