1 files changed, 51 insertions, 2 deletions

diff --git a/src/map/fpga/fpgaUtils.c b/src/map/fpga/fpgaUtils.c
index db0f9623..b951fd8f 100644
--- a/src/map/fpga/fpgaUtils.c
+++ b/src/map/fpga/fpgaUtils.c
@@ -30,10 +30,11 @@ static int   Fpga_MappingCompareOutputDelay( Fpga_Node_t ** ppNode1, Fpga_Node_t
 static void  Fpga_MappingFindLatest( Fpga_Man_t * p, int * pNodes, int nNodesMax );
 static void  Fpga_DfsLim_rec( Fpga_Node_t * pNode, int Level, Fpga_NodeVec_t * vNodes );
 static int   Fpga_CollectNodeTfo_rec( Fpga_Node_t * pNode, Fpga_Node_t * pPivot, Fpga_NodeVec_t * vVisited, Fpga_NodeVec_t * vTfo );
+static Fpga_NodeVec_t * Fpga_MappingOrderCosByLevel( Fpga_Man_t * pMan );
 static Fpga_Man_t * s_pMan = NULL;
 
 ////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFITIONS                           ///
+///                     FUNCTION DEFINITIONS                         ///
 ////////////////////////////////////////////////////////////////////////
 
 
@@ -50,9 +51,11 @@ static Fpga_Man_t * s_pMan = NULL;
 ***********************************************************************/
 Fpga_NodeVec_t * Fpga_MappingDfs( Fpga_Man_t * pMan, int fCollectEquiv )
 {
-    Fpga_NodeVec_t * vNodes;
+    Fpga_NodeVec_t * vNodes;//, * vNodesCo;
     Fpga_Node_t * pNode;
     int i;
+    // collect the CO nodes by level
+//    vNodesCo = Fpga_MappingOrderCosByLevel( pMan );
     // start the array
     vNodes = Fpga_NodeVecAlloc( 100 );
     // collect the PIs
@@ -65,10 +68,15 @@ Fpga_NodeVec_t * Fpga_MappingDfs( Fpga_Man_t * pMan, int fCollectEquiv )
     // perform the traversal
     for ( i = 0; i < pMan->nOutputs; i++ )
         Fpga_MappingDfs_rec( Fpga_Regular(pMan->pOutputs[i]), vNodes, fCollectEquiv );
+//    for ( i = vNodesCo->nSize - 1; i >= 0 ; i-- )
+//        for ( pNode = vNodesCo->pArray[i]; pNode; pNode = (Fpga_Node_t *)pNode->pData0 )
+//            Fpga_MappingDfs_rec( pNode, vNodes, fCollectEquiv );
+    // clean the node marks
     for ( i = 0; i < vNodes->nSize; i++ )
         vNodes->pArray[i]->fMark0 = 0;
 //    for ( i = 0; i < pMan->nOutputs; i++ )
 //        Fpga_MappingUnmark_rec( Fpga_Regular(pMan->pOutputs[i]) );
+//    Fpga_NodeVecFree( vNodesCo );
     return vNodes;
 }
 
@@ -930,6 +938,47 @@ void Fpga_ManReportChoices( Fpga_Man_t * pMan )
 */
 }
 
+/**Function*************************************************************
+
+  Synopsis    [Returns the array of CO nodes sorted by level.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fpga_NodeVec_t * Fpga_MappingOrderCosByLevel( Fpga_Man_t * pMan )
+{
+    Fpga_Node_t * pNode;
+    Fpga_NodeVec_t * vNodes;
+    int i, nLevels;
+    // get the largest level of a CO
+    nLevels = Fpga_MappingMaxLevel( pMan );
+    // allocate the array of nodes
+    vNodes = Fpga_NodeVecAlloc( nLevels + 1 );
+    for ( i = 0; i <= nLevels; i++ )
+        Fpga_NodeVecPush( vNodes, NULL );
+    // clean the marks
+    for ( i = 0; i < pMan->nOutputs; i++ )
+        Fpga_Regular(pMan->pOutputs[i])->fMark0 = 0;
+    // put the nodes into the structure
+    for ( i = 0; i < pMan->nOutputs; i++ )
+    {
+        pNode = Fpga_Regular(pMan->pOutputs[i]);
+        if ( pNode->fMark0 )
+            continue;
+        pNode->fMark0 = 1;
+        pNode->pData0 = (char *)Fpga_NodeVecReadEntry( vNodes, pNode->Level );
+        Fpga_NodeVecWriteEntry( vNodes, pNode->Level, pNode );
+    }
+    for ( i = 0; i < pMan->nOutputs; i++ )
+        Fpga_Regular(pMan->pOutputs[i])->fMark0 = 0;
+    return vNodes;
+
+}
+
 ////////////////////////////////////////////////////////////////////////
 ///                       END OF FILE                                ///
 ////////////////////////////////////////////////////////////////////////