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Grid/lib/Bitwise.h
2016-12-09 02:29:12 +00:00

77 lines
2.1 KiB
C++

/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/Bitwise.h
Copyright (C) 2016
Author: Guido Cossu <guido.cossu@ed.ac.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution
directory
*************************************************************************************/
/* END LEGAL */
#ifndef GRID_BITWISE_H
#define GRID_BITWISE_H
#include <cassert>
#include <cfloat>
#include <bitset>
#include <climits>
#include <Config.h>
#ifdef GRID_DEFAULT_PRECISION_SINGLE
#define GRID_REAL_BYTES 4
#endif
#ifdef GRID_DEFAULT_PRECISION_DOUBLE
#define GRID_REAL_BYTES 8
#endif
namespace Grid {
void show_binaryrep(const unsigned char* a, size_t size);
template <typename T>
void show_binaryrep(const T& a) {
const char* beg = reinterpret_cast<const char*>(&a);
const char* end = beg + sizeof(a);
unsigned int ctr = 0;
while (beg != end) {
std::cout << std::bitset<CHAR_BIT>(*beg++) << ' ';
ctr++;
if (ctr % GRID_REAL_BYTES == 0) std::cout << '\n';
}
std::cout << '\n';
}
template <typename T>
void bitwise_xor(T& l, T& r, unsigned char* xors) {
assert(sizeof(l) == sizeof(r));
unsigned char* org = reinterpret_cast<unsigned char*>(&l);
unsigned char* cur = reinterpret_cast<unsigned char*>(&r);
int words = sizeof(l) / sizeof(*org);
unsigned char result = 0;
for (int w = 0; w < words; w++) xors[w] = (org[w] ^ cur[w]);
}
}; // namespace
#endif