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diff --git a/src/aig/gia/giaReparam.c b/src/aig/gia/giaReparam.c
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+/**CFile****************************************************************
+
+  FileName    [gia.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Scalable AIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: gia.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "gia.h"
+#include "giaAig.h"
+#include "saig.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Specialized duplication.]
+
+  Description [Replaces registers by PIs/POs and PIs by registers.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManDupIn2Ff( Gia_Man_t * p )
+{
+    Vec_Int_t * vPiOuts;
+    Gia_Man_t * pNew; 
+    Gia_Obj_t * pObj;
+    int i;
+    vPiOuts = Vec_IntAlloc( Gia_ManPiNum(p) );
+    pNew = Gia_ManStart( Gia_ManObjNum(p) + 2 * Gia_ManPiNum(p) );
+    pNew->pName = Gia_UtilStrsav( p->pName );
+    Gia_ManFillValue( p );
+    Gia_ManConst0(p)->Value = 0;
+    Gia_ManForEachPi( p, pObj, i )
+        Vec_IntPush( vPiOuts, Gia_ManAppendCi(pNew) );
+    Gia_ManForEachRo( p, pObj, i )
+        pObj->Value = Gia_ManAppendCi( pNew );
+    Gia_ManForEachPi( p, pObj, i )
+        pObj->Value = Gia_ManAppendCi( pNew );
+    Gia_ManForEachAnd( p, pObj, i )
+        pObj->Value = Gia_ManAppendAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
+    Gia_ManForEachPo( p, pObj, i )
+        pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
+    Gia_ManForEachRi( p, pObj, i )
+        pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
+    Gia_ManForEachPi( p, pObj, i )
+        Gia_ManAppendCo( pNew, Vec_IntEntry(vPiOuts, i) );
+    Gia_ManSetRegNum( pNew, Gia_ManPiNum(p) );
+    Vec_IntFree( vPiOuts );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reverses the above step.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Gia_ManDupFf2In_rec( Gia_Man_t * pNew, Gia_Obj_t * pObj )
+{
+    if ( pObj->Value != ~0 )
+        return pObj->Value;
+    assert( Gia_ObjIsAnd(pObj) );
+    Gia_ManDupFf2In_rec( pNew, Gia_ObjFanin0(pObj) );
+    Gia_ManDupFf2In_rec( pNew, Gia_ObjFanin1(pObj) );
+    return pObj->Value = Gia_ManAppendAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reverses the above step.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManDupFf2In( Gia_Man_t * p, int nFlopsOld )
+{
+    Gia_Man_t * pNew; 
+    Gia_Obj_t * pObj;
+    int i;
+    pNew = Gia_ManStart( Gia_ManObjNum(p) );
+    pNew->pName = Gia_UtilStrsav( p->pName );
+    Gia_ManFillValue( p );
+    Gia_ManConst0(p)->Value = 0;
+    Gia_ManForEachRo( p, pObj, i )
+        pObj->Value = Gia_ManAppendCi( pNew );
+    for ( i = Gia_ManPiNum(p) - nFlopsOld; i < Gia_ManPiNum(p); i++ )
+        Gia_ManPi(p, i)->Value = Gia_ManAppendCi( pNew );
+    Gia_ManForEachPo( p, pObj, i )
+        Gia_ManDupFf2In_rec( pNew, Gia_ObjFanin0(pObj) );
+    Gia_ManForEachPo( p, pObj, i )
+        Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
+    Gia_ManSetRegNum( pNew, nFlopsOld );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reparameterized to get rid of useless primary inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManReparm( Gia_Man_t * p, int fVerbose )
+{
+//    extern Aig_Man_t * Saig_ManRetimeMinArea( Aig_Man_t * p, int nMaxIters, int fForwardOnly, int fBackwardOnly, int fInitial, int fVerbose );
+    Aig_Man_t * pMan, * pTemp;
+    Gia_Man_t * pNew, * pTmp;
+    int nFlopsOld = Gia_ManRegNum(p);
+    if ( fVerbose )
+    {
+        printf( "Original AIG:\n" );
+        Gia_ManPrintStats( p, 0 );
+    }
+
+    // perform input trimming
+    pNew = Gia_ManDupTrimmed( p, 1, 0 );
+    if ( fVerbose )
+    {
+        printf( "After PI trimming:\n" );
+        Gia_ManPrintStats( pNew, 0 );
+    }
+    // transform GIA
+    pNew = Gia_ManDupIn2Ff( pTmp = pNew );
+    Gia_ManStop( pTmp );
+    if ( fVerbose )
+    {
+        printf( "After PI-2-FF transformation:\n" );
+        Gia_ManPrintStats( pNew, 0 );
+    }
+
+    // derive AIG
+    pMan = Gia_ManToAigSimple( pNew );
+    Gia_ManStop( pNew );
+    // perform min-reg retiming
+    pMan = Saig_ManRetimeMinArea( pTemp = pMan, 10, 0, 0, 1, 0 );
+    Aig_ManStop( pTemp );
+    // derive GIA
+    pNew = Gia_ManFromAigSimple( pMan );
+    Aig_ManStop( pMan );
+    if ( fVerbose )
+    {
+        printf( "After min-area retiming:\n" );
+        Gia_ManPrintStats( pNew, 0 );
+    }
+
+    // transform back
+    pNew = Gia_ManDupFf2In( pTmp = pNew, nFlopsOld );
+    Gia_ManStop( pTmp );
+    if ( fVerbose )
+    {
+        printf( "After FF-2-PI tranformation:\n" );
+        Gia_ManPrintStats( pNew, 0 );
+    }
+    return pNew;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+