1 files changed, 102 insertions, 0 deletions
diff --git a/src/intersim/loa.cpp b/src/intersim/loa.cpp
new file mode 100644
index 0000000..c7501f3
--- /dev/null
+++ b/src/intersim/loa.cpp
@@ -0,0 +1,102 @@
+#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;
+         }
+      }
+   }
+
+
+}
+
+