From feb8fb692e09a2fc7c1da4f2fcf605d398e940f2 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Sat, 28 Apr 2007 08:01:00 -0700
Subject: Version abc70428

---
 src/aig/dar/darCore.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/aig/dar/darCore.c

(limited to 'src/aig/dar/darCore.c')

diff --git a/src/aig/dar/darCore.c b/src/aig/dar/darCore.c
new file mode 100644
index 00000000..9f0f58f6
--- /dev/null
+++ b/src/aig/dar/darCore.c
@@ -0,0 +1,106 @@
+/**CFile****************************************************************
+
+  FileName    [darCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Core of the rewriting package.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darCore.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "dar.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_ManRewrite( Dar_Man_t * p )
+{
+    ProgressBar * pProgress;
+    Dar_Obj_t * pObj, * pObjNew;
+    int i, k, nNodesOld, nNodeBefore, nNodeAfter, Required;
+    int clk = 0, clkStart = clock();
+    // remove dangling nodes
+    Dar_ManCleanup( p );
+    // set elementary cuts for the PIs
+    Dar_ManSetupPis( p );
+//    if ( p->pPars->fUpdateLevel )
+//        Dar_NtkStartReverseLevels( p );
+    // resynthesize each node once
+    nNodesOld = Vec_PtrSize( p->vObjs );
+    pProgress = Extra_ProgressBarStart( stdout, nNodesOld );
+    Dar_ManForEachObj( p, pObj, i )
+    {
+        Extra_ProgressBarUpdate( pProgress, i, NULL );
+        if ( !Dar_ObjIsNode(pObj) )
+            continue;
+        if ( i > nNodesOld )
+            break;
+        // compute cuts for the node
+        Dar_ObjComputeCuts_rec( p, pObj );
+        // go through the cuts of this node
+        Required = 1000000;
+        p->GainBest = -1;
+        for ( k = 1; k < (int)pObj->nCuts; k++ )
+            Dar_LibEval( p, pObj, (Dar_Cut_t *)pObj->pData + k, Required );
+        // check the best gain
+        if ( !(p->GainBest > 0 || p->GainBest == 0 && p->pPars->fUseZeros) )
+            continue;
+        // if we end up here, a rewriting step is accepted
+        nNodeBefore = Dar_ManNodeNum( p );
+        pObjNew = Dar_LibBuildBest( p );
+        pObjNew = Dar_NotCond( pObjNew, pObjNew->fPhase ^ pObj->fPhase );
+        // remove the old nodes
+        Dar_ObjReplace( p, pObj, pObjNew );
+        // compare the gains
+        nNodeAfter = Dar_ManNodeNum( p );
+        assert( p->GainBest == nNodeBefore - nNodeAfter );
+        assert( (int)pObjNew->Level <= Required );
+    }
+    Extra_ProgressBarStop( pProgress );
+    Dar_ManCutsFree( p );
+    // put the nodes into the DFS order and reassign their IDs
+//    Dar_NtkReassignIds( p );
+
+    // fix the levels
+//    if ( p->pPars->fUpdateLevel )
+//        Dar_NtkStopReverseLevels( p );
+    // check
+    if ( !Dar_ManCheck( p ) )
+    {
+        printf( "Dar_ManRewrite: The network check has failed.\n" );
+        return 0;
+    }
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
-- 
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