1 files changed, 150 insertions, 0 deletions
diff --git a/src/aig/rwt/rwtDec.c b/src/aig/rwt/rwtDec.c
new file mode 100644
index 00000000..98019629
--- /dev/null
+++ b/src/aig/rwt/rwtDec.c
@@ -0,0 +1,150 @@
+/**CFile****************************************************************
+
+  FileName    [rwtDec.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting package.]
+
+  Synopsis    [Evaluation and decomposition procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: rwtDec.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "rwt.h"
+#include "deco.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Dec_Graph_t * Rwt_NodePreprocess( Rwt_Man_t * p, Rwt_Node_t * pNode );
+static Dec_Edge_t    Rwt_TravCollect_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, Dec_Graph_t * pGraph );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Preprocesses computed library of subgraphs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManPreprocess( Rwt_Man_t * p )
+{
+    Dec_Graph_t * pGraph;
+    Rwt_Node_t * pNode;
+    int i, k;
+    // put the nodes into the structure
+    p->pMapInv  = ALLOC( unsigned short, 222 );
+    memset( p->pMapInv, 0, sizeof(unsigned short) * 222 );
+    p->vClasses = Vec_VecStart( 222 );
+    for ( i = 0; i < p->nFuncs; i++ )
+    {
+        if ( p->pTable[i] == NULL )
+            continue;
+        // consider all implementations of this function
+        for ( pNode = p->pTable[i]; pNode; pNode = pNode->pNext )
+        {
+            assert( pNode->uTruth == p->pTable[i]->uTruth );
+            assert( p->pMap[pNode->uTruth] >= 0 && p->pMap[pNode->uTruth] < 222 );
+            Vec_VecPush( p->vClasses, p->pMap[pNode->uTruth], pNode );
+            p->pMapInv[ p->pMap[pNode->uTruth] ] = p->puCanons[pNode->uTruth];
+        }
+    }
+    // compute decomposition forms for each node and verify them
+    Vec_VecForEachEntry( p->vClasses, pNode, i, k )
+    {
+        pGraph = Rwt_NodePreprocess( p, pNode );
+        pNode->pNext = (Rwt_Node_t *)pGraph;
+//        assert( pNode->uTruth == (Dec_GraphDeriveTruth(pGraph) & 0xFFFF) );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Preprocesses subgraphs rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dec_Graph_t * Rwt_NodePreprocess( Rwt_Man_t * p, Rwt_Node_t * pNode )
+{
+    Dec_Graph_t * pGraph;
+    Dec_Edge_t eRoot;
+    assert( !Rwt_IsComplement(pNode) );
+    // consider constant
+    if ( pNode->uTruth == 0 )
+        return Dec_GraphCreateConst0();
+    // consider the case of elementary var
+    if ( pNode->uTruth == 0x00FF )
+        return Dec_GraphCreateLeaf( 3, 4, 1 );
+    // start the subgraphs
+    pGraph = Dec_GraphCreate( 4 );
+    // collect the nodes
+    Rwt_ManIncTravId( p );
+    eRoot = Rwt_TravCollect_rec( p, pNode, pGraph );
+    Dec_GraphSetRoot( pGraph, eRoot );
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dec_Edge_t Rwt_TravCollect_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, Dec_Graph_t * pGraph )
+{
+    Dec_Edge_t eNode0, eNode1, eNode;
+    // elementary variable
+    if ( pNode->fUsed )
+        return Dec_EdgeCreate( pNode->Id - 1, 0 );
+    // previously visited node
+    if ( pNode->TravId == p->nTravIds )
+        return Dec_IntToEdge( pNode->Volume );
+    pNode->TravId = p->nTravIds;
+    // solve for children
+    eNode0 = Rwt_TravCollect_rec( p, Rwt_Regular(pNode->p0), pGraph );
+    if ( Rwt_IsComplement(pNode->p0) )    
+        eNode0.fCompl = !eNode0.fCompl;
+    eNode1 = Rwt_TravCollect_rec( p, Rwt_Regular(pNode->p1), pGraph );
+    if ( Rwt_IsComplement(pNode->p1) )    
+        eNode1.fCompl = !eNode1.fCompl;
+    // create the decomposition node(s)
+    if ( pNode->fExor )
+        eNode = Dec_GraphAddNodeXor( pGraph, eNode0, eNode1, 0 );
+    else
+        eNode = Dec_GraphAddNodeAnd( pGraph, eNode0, eNode1 );
+    // save the result
+    pNode->Volume = Dec_EdgeToInt( eNode );
+    return eNode;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+