unsigned add_line_to_circuit( circuit& circ, const std::string& input, const std::string& output, const constant& c, bool g )
{
std::vector<std::string> ins = circ.inputs();
std::vector<std::string> outs = circ.outputs();
std::vector<constant> cs = circ.constants();
std::vector<bool> gar = circ.garbage();
circ.set_lines( circ.lines() + 1u );
ins += input;
circ.set_inputs( ins );
outs += output;
circ.set_outputs( outs );
cs += c;
circ.set_constants( cs );
gar += g;
circ.set_garbage( gar );
return circ.lines() - 1u;
}
bool transposition_based_synthesis( circuit& circ, const binary_truth_table& spec,
properties::ptr settings, properties::ptr statistics )
{
// Settings parsing
// Run-time measuring
timer<properties_timer> t;
if ( statistics )
{
properties_timer rt( statistics );
t.start( rt );
}
unsigned bw = spec.num_outputs();
circ.set_lines( bw );
copy_metadata( spec, circ );
std::map<unsigned, unsigned> values_map;
for ( binary_truth_table::const_iterator it = spec.begin(); it != spec.end(); ++it )
{
binary_truth_table::cube_type in( it->first.first, it->first.second );
binary_truth_table::cube_type out( it->second.first, it->second.second );
values_map.insert( std::make_pair( truth_table_cube_to_number( in ), truth_table_cube_to_number( out ) ) );
}
// Set of cycles
std::vector<std::vector<unsigned> > cycles;
while ( !values_map.empty() )
{
unsigned start_value = values_map.begin()->first; // first key in values_map
std::vector<unsigned> cycle;
unsigned target = start_value;
do
{
cycle += target;
unsigned old_target = target;
target = values_map[target];
values_map.erase( old_target ); // erase this entry
} while ( target != start_value );
cycles += cycle;
}
for ( auto& cycle : cycles )
{
unsigned max_distance = 0u;
unsigned max_index = 0u;
for ( unsigned i = 0u; i < cycle.size(); ++i )
{
unsigned first = cycle.at(i);
unsigned second = cycle.at( (i + 1u) % cycle.size() );
unsigned distance = hamming_distance( first, second );
if ( distance > max_distance )
{
max_distance = distance;
max_index = i;
}
}
std::vector<unsigned> tmp;
std::copy( cycle.begin() + ( max_index + 1u ), cycle.end(), std::back_inserter( tmp ) );
std::copy( cycle.begin(), cycle.begin() + ( max_index + 1u ), std::back_inserter( tmp ) );
std::copy( tmp.begin(), tmp.end(), cycle.begin() );
std::reverse( cycle.begin(), cycle.end() );
}
// TODO create transpositions function
for ( auto& cycle : cycles )
{
for ( unsigned i = 0u; i < cycle.size() - 1; ++i )
{
circuit transposition_circ( spec.num_inputs() );
unsigned first = cycle.at(i);
unsigned second = cycle.at( (i + 1) % cycle.size() );
boost::dynamic_bitset<> first_bits( spec.num_inputs(), first );
boost::dynamic_bitset<> second_bits( spec.num_inputs(), second );
transposition_to_circuit( transposition_circ, first_bits, second_bits );
append_circuit( circ, transposition_circ);
}
}
return true;
}
