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#include "booksim.hpp"
#include <iostream>
#include "loa.hpp"
#include "random_utils.hpp"
LOA::LOA( const Configuration &config,
Module *parent, const string& name,
int inputs, int input_speedup,
int outputs, int output_speedup ) :
DenseAllocator( config, parent, name, inputs, outputs )
{
_req = new int [_inputs];
_counts = new int [_outputs];
_rptr = new int [_inputs];
_gptr = new int [_outputs];
}
LOA::~LOA( )
{
delete [] _req;
delete [] _counts;
delete [] _rptr;
delete [] _gptr;
}
void LOA::Allocate( )
{
int input;
int output;
int input_offset;
int output_offset;
int lonely;
int lonely_cnt;
// Clear matching
// Count phase --- the number of requests
// per output is counted
for ( int i = 0; i < _inputs; ++i ) {
_inmatch[i] = -1;
}
for ( int j = 0; j < _outputs; ++j ) {
_outmatch[j] = -1;
_counts[j] = 0;
for ( int i = 0; i < _inputs; ++i ) {
_counts[j] += ( _request[i][j].label != -1 ) ? 1 : 0;
}
}
// Request phase
for ( input = 0; input < _inputs; ++input ) {
// Find the lonely output
output_offset = _rptr[input];
lonely = -1;
lonely_cnt = _inputs + 1;
for ( int o = 0; o < _outputs; ++o ) {
output = ( o + output_offset ) % _outputs;
if ( ( _request[input][output].label != -1 ) &&
( _counts[output] < lonely_cnt ) ) {
lonely = output;
lonely_cnt = _counts[output];
}
}
// Request the lonely output (-1 for no request)
_req[input] = lonely;
}
// Grant phase
for ( output = 0; output < _outputs; ++output ) {
input_offset = _gptr[output];
for ( int i = 0; i < _inputs; ++i ) {
input = ( i + input_offset ) % _inputs;
if ( _req[input] == output ) {
// Grant!
_inmatch[input] = output;
_outmatch[output] = input;
_rptr[input] = ( _rptr[input] + 1 ) % _outputs;
_gptr[output] = ( _gptr[output] + 1 ) % _inputs;
break;
}
}
}
}
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