Major restructuring of the code.

1 files changed, 0 insertions, 1385 deletions

diff --git a/src/opt/fret/fretMain.c b/src/opt/fret/fretMain.c
deleted file mode 100644
index 141baff4..00000000
--- a/src/opt/fret/fretMain.c
+++ /dev/null
@@ -1,1385 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fretMain.c]
-
-  SystemName  [ABC: Logic synthesis and verification system.]
-
-  PackageName [Flow-based retiming package.]
-
-  Synopsis    [Main file for retiming package.]
-
-  Author      [Aaron Hurst]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 1.0. Started - January 1, 2008.]
-
-  Revision    [$Id: fretMain.c,v 1.00 2008/01/01 00:00:00 ahurst Exp $]
-
-***********************************************************************/
-
-#include "abc.h"
-#include "vec.h"
-#include "fretime.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-static void Abc_FlowRetime_AddDummyFanin( Abc_Obj_t * pObj );
-
-static Abc_Ntk_t* Abc_FlowRetime_MainLoop( );
-
-static void Abc_FlowRetime_MarkBlocks( Abc_Ntk_t * pNtk );
-static void Abc_FlowRetime_MarkReachable_rec( Abc_Obj_t * pObj, char end );
-static int  Abc_FlowRetime_ImplementCut( Abc_Ntk_t * pNtk );
-static void  Abc_FlowRetime_RemoveLatchBubbles( Abc_Obj_t * pLatch );
-
-static Abc_Ntk_t* Abc_FlowRetime_NtkDup( Abc_Ntk_t * pNtk );
-
-static void Abc_FlowRetime_VerifyPathLatencies( Abc_Ntk_t * pNtk );
-static int  Abc_FlowRetime_VerifyPathLatencies_rec( Abc_Obj_t * pObj, int markD );
-
-static void Abc_FlowRetime_UpdateLags_forw_rec( Abc_Obj_t *pObj );
-static void Abc_FlowRetime_UpdateLags_back_rec( Abc_Obj_t *pObj );
-
-extern void Abc_NtkMarkCone_rec( Abc_Obj_t * pObj, int fForward );
-
-void
-print_node3(Abc_Obj_t *pObj);
-
-MinRegMan_t *pManMR;
-
-int          fPathError = 0;
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Performs minimum-register retiming.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Abc_Ntk_t *
-Abc_FlowRetime_MinReg( Abc_Ntk_t * pNtk, int fVerbose, 
-                       int fComputeInitState, int fGuaranteeInitState, int fBlockConst,
-                       int fForwardOnly, int fBackwardOnly, int nMaxIters,
-                       int maxDelay, int fFastButConservative ) {
-
-  int i;
-  Abc_Obj_t   *pObj, *pNext;
-  InitConstraint_t *pData;
-
-  // create manager
-  pManMR = ALLOC( MinRegMan_t, 1 );
-
-  pManMR->pNtk = pNtk;
-  pManMR->fVerbose = fVerbose;
-  pManMR->fComputeInitState = fComputeInitState;
-  pManMR->fGuaranteeInitState = fGuaranteeInitState;
-  pManMR->fBlockConst = fBlockConst;
-  pManMR->fForwardOnly = fForwardOnly;
-  pManMR->fBackwardOnly = fBackwardOnly;
-  pManMR->nMaxIters = nMaxIters;
-  pManMR->maxDelay = maxDelay;
-  pManMR->fComputeInitState = fComputeInitState;
-  pManMR->fConservTimingOnly = fFastButConservative;
-  pManMR->vNodes = Vec_PtrAlloc(100);
-  pManMR->vInitConstraints = Vec_PtrAlloc(2);
-  pManMR->pInitNtk = NULL;
-  pManMR->pInitToOrig = NULL;
-  pManMR->sizeInitToOrig = 0;
-
-  vprintf("Flow-based minimum-register retiming...\n");  
-
-  if (!Abc_NtkHasOnlyLatchBoxes(pNtk)) {
-    printf("\tERROR: Can not retime with black/white boxes\n");
-    return pNtk;
-  }
-
-  if (maxDelay) {
-    vprintf("\tmax delay constraint = %d\n", maxDelay);
-    if (maxDelay < (i = Abc_NtkLevel(pNtk))) {
-      printf("ERROR: max delay constraint (%d) must be > current max delay (%d)\n", maxDelay, i);
-      return pNtk;
-    }
-  }
-
-  // print info about type of network
-  vprintf("\tnetlist type = ");
-  if (Abc_NtkIsNetlist( pNtk )) { vprintf("netlist/"); }
-  else if (Abc_NtkIsLogic( pNtk )) { vprintf("logic/"); }
-  else if (Abc_NtkIsStrash( pNtk )) { vprintf("strash/"); }
-  else { vprintf("***unknown***/"); }
-  if (Abc_NtkHasSop( pNtk )) { vprintf("sop\n"); }
-  else if (Abc_NtkHasBdd( pNtk )) { vprintf("bdd\n"); }
-  else if (Abc_NtkHasAig( pNtk )) { vprintf("aig\n"); }
-  else if (Abc_NtkHasMapping( pNtk )) { vprintf("mapped\n"); }
-  else { vprintf("***unknown***\n"); }
-
-  vprintf("\tinitial reg count = %d\n", Abc_NtkLatchNum(pNtk));
-  vprintf("\tinitial levels = %d\n", Abc_NtkLevel(pNtk));
-
-  // remove bubbles from latch boxes
-  if (pManMR->fVerbose) Abc_FlowRetime_PrintInitStateInfo(pNtk);
-  vprintf("\tpushing bubbles out of latch boxes\n");
-  Abc_NtkForEachLatch( pNtk, pObj, i )
-    Abc_FlowRetime_RemoveLatchBubbles(pObj);
-  if (pManMR->fVerbose) Abc_FlowRetime_PrintInitStateInfo(pNtk);
-
-  // check for box inputs/outputs
-  Abc_NtkForEachLatch( pNtk, pObj, i ) {
-    assert(Abc_ObjFaninNum(pObj) == 1);
-    assert(Abc_ObjFanoutNum(pObj) == 1);
-    assert(!Abc_ObjFaninC0(pObj));
-
-    pNext = Abc_ObjFanin0(pObj);
-    assert(Abc_ObjIsBi(pNext));
-    assert(Abc_ObjFaninNum(pNext) <= 1);
-    if(Abc_ObjFaninNum(pNext) == 0) // every Bi should have a fanin
-      Abc_FlowRetime_AddDummyFanin( pNext );
- 
-    pNext = Abc_ObjFanout0(pObj);
-    assert(Abc_ObjIsBo(pNext));
-    assert(Abc_ObjFaninNum(pNext) == 1);
-    assert(!Abc_ObjFaninC0(pNext));
-  }
-
-  pManMR->nLatches = Abc_NtkLatchNum( pNtk );
-  pManMR->nNodes = Abc_NtkObjNumMax( pNtk )+1;
-   
-  // build histogram
-  pManMR->vSinkDistHist = Vec_IntStart( pManMR->nNodes*2+10 );
-
-  // initialize timing
-  if (maxDelay)
-    Abc_FlowRetime_InitTiming( pNtk );
-
-  // create lag and Flow_Data structure
-  pManMR->vLags = Vec_IntStart(pManMR->nNodes);
-  memset(pManMR->vLags->pArray, 0, sizeof(int)*pManMR->nNodes);
-
-  pManMR->pDataArray = ALLOC( Flow_Data_t, pManMR->nNodes );
-  Abc_FlowRetime_ClearFlows( 1 );
-
-  // main loop!
-  pNtk = Abc_FlowRetime_MainLoop();
-
-  // cleanup node fields
-  Abc_NtkForEachObj( pNtk, pObj, i ) {
-    // if not computing init state, set all latches to DC
-    if (!fComputeInitState && Abc_ObjIsLatch(pObj))
-      Abc_LatchSetInitDc(pObj);
-  }
-
-  // deallocate space
-  FREE( pManMR->pDataArray );
-  if (pManMR->pInitToOrig) FREE( pManMR->pInitToOrig );
-  if (pManMR->vNodes) Vec_PtrFree(pManMR->vNodes);
-  if (pManMR->vLags) Vec_IntFree(pManMR->vLags);
-  if (pManMR->vSinkDistHist) Vec_IntFree(pManMR->vSinkDistHist);
-  if (pManMR->maxDelay) Abc_FlowRetime_FreeTiming( pNtk );
-  while( Vec_PtrSize( pManMR->vInitConstraints )) {
-    pData = Vec_PtrPop( pManMR->vInitConstraints );
-    //assert( pData->pBiasNode );
-    //Abc_NtkDeleteObj( pData->pBiasNode );
-    FREE( pData->vNodes.pArray );
-    FREE( pData );
-  }
-  FREE( pManMR->vInitConstraints );
-
-  // restrash if necessary
-  if (Abc_NtkIsStrash(pNtk)) {
-    Abc_NtkReassignIds( pNtk );
-    pNtk = Abc_FlowRetime_NtkSilentRestrash( pNtk, 1 );
-  }
-  
-  vprintf("\tfinal reg count = %d\n", Abc_NtkLatchNum(pNtk));
-  vprintf("\tfinal levels = %d\n", Abc_NtkLevel(pNtk));
-
-#if defined(DEBUG_CHECK)
-  Abc_NtkDoCheck( pNtk );
-#endif
-
-  // free manager
-  FREE( pManMR );
-
-  return pNtk;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Main loop.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Abc_Ntk_t *
-Abc_FlowRetime_MainLoop( ) {
-  Abc_Ntk_t *pNtk = pManMR->pNtk, *pNtkCopy = pNtk;
-  Abc_Obj_t *pObj; int i;
-  int last, flow = 0, cut;
-
-  // (i) forward retiming loop
-  pManMR->fIsForward = 1;
-  pManMR->iteration = 0;
-
-  if (!pManMR->fBackwardOnly) do {
-    if (pManMR->iteration == pManMR->nMaxIters) break;
-    pManMR->subIteration = 0;
-
-    vprintf("\tforward iteration %d\n", pManMR->iteration);
-    last = Abc_NtkLatchNum( pNtk );
-
-    Abc_FlowRetime_MarkBlocks( pNtk );
-
-    if (pManMR->maxDelay) {
-      // timing-constrained loop
-      Abc_FlowRetime_ConstrainConserv( pNtk );
-      while(Abc_FlowRetime_RefineConstraints( )) {
-        pManMR->subIteration++;
-        Abc_FlowRetime_ClearFlows( 0 );
-      }
-    } else {
-      flow = Abc_FlowRetime_PushFlows( pNtk, 1 );
-    }
-
-    cut = Abc_FlowRetime_ImplementCut( pNtk );
-
-#if defined (DEBUG_PRINT_LEVELS)
-    vprintf("\t\tlevels = %d\n", Abc_NtkLevel(pNtk));
-#endif
-
-    Abc_FlowRetime_ClearFlows( 1 );
-
-    pManMR->iteration++;
-  } while( cut != last );
-  
-  // intermediate cleanup (for strashed networks)
-  if (Abc_NtkIsStrash(pNtk)) {
-    Abc_NtkReassignIds( pNtk );
-    pNtk = pManMR->pNtk = Abc_FlowRetime_NtkSilentRestrash( pNtk, 1 );
-  }
-
-  // print info about initial states
-  if (pManMR->fComputeInitState && pManMR->fVerbose)
-    Abc_FlowRetime_PrintInitStateInfo( pNtk );
-
-  // (ii) backward retiming loop
-  pManMR->fIsForward = 0;
-
-  if (!pManMR->fForwardOnly) do {
-    // initializability loop
-    pManMR->iteration = 0;
-
-    // copy/restore network
-    if (pManMR->fGuaranteeInitState) {
-      if ( pNtk != pNtkCopy )
-        Abc_NtkDelete( pNtk );
-      pNtk = pManMR->pNtk = Abc_FlowRetime_NtkDup( pNtkCopy );
-      vprintf("\trestoring network. regs = %d\n", Abc_NtkLatchNum( pNtk ));
-    }
-
-    if (pManMR->fComputeInitState) {
-      Abc_FlowRetime_SetupBackwardInit( pNtk );
-    }
-
-    do {
-      if (pManMR->iteration == pManMR->nMaxIters) break;
-      pManMR->subIteration = 0;
-
-      vprintf("\tbackward iteration %d\n", pManMR->iteration);
-      last = Abc_NtkLatchNum( pNtk );
-
-      Abc_FlowRetime_AddInitBias( );
-      Abc_FlowRetime_MarkBlocks( pNtk );
-
-      if (pManMR->maxDelay) {
-        // timing-constrained loop
-        Abc_FlowRetime_ConstrainConserv( pNtk );
-        while(Abc_FlowRetime_RefineConstraints( )) {
-          pManMR->subIteration++;
-          Abc_FlowRetime_ClearFlows( 0 );
-        }
-      } else {
-        flow = Abc_FlowRetime_PushFlows( pNtk, 1 );
-      }
-
-      Abc_FlowRetime_RemoveInitBias( );
-      cut = Abc_FlowRetime_ImplementCut( pNtk );
-
-#if defined(DEBUG_PRINT_LEVELS)
-      vprintf("\t\tlevels = %d\n", Abc_NtkLevelReverse(pNtk));
-#endif      
-
-      Abc_FlowRetime_ClearFlows( 1 );
-
-      pManMR->iteration++;
-    } while( cut != last );
-    
-    // compute initial states
-    if (!pManMR->fComputeInitState) break;
-
-    if (Abc_FlowRetime_SolveBackwardInit( pNtk )) {
-      if (pManMR->fVerbose) Abc_FlowRetime_PrintInitStateInfo( pNtk );
-      break;
-    } else {
-      if (!pManMR->fGuaranteeInitState) {
-        printf("WARNING: no equivalent init state. setting all initial states to don't-cares\n");
-        Abc_NtkForEachLatch( pNtk, pObj, i ) Abc_LatchSetInitDc( pObj );
-        break;
-      }
-      Abc_FlowRetime_ConstrainInit( );
-    }
-    
-    Abc_NtkDelete(pManMR->pInitNtk);
-    pManMR->pInitNtk = NULL;
-  } while(1);
-
-//  assert(!pManMR->fComputeInitState || pManMR->pInitNtk);
-  if (pManMR->fComputeInitState)   Abc_NtkDelete(pManMR->pInitNtk);
-  if (pManMR->fGuaranteeInitState) ; /* Abc_NtkDelete(pNtkCopy); note: original ntk deleted later */
-
-  return pNtk;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Pushes latch bubbles outside of box.]
-
-  Description [If network is an AIG, a fCompl0 is allowed to remain on
-               the BI node.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_RemoveLatchBubbles( Abc_Obj_t * pLatch ) {
-  int bubble = 0;
-  Abc_Ntk_t *pNtk = pManMR->pNtk;
-  Abc_Obj_t *pBi, *pBo, *pInv;
-      
-  pBi = Abc_ObjFanin0(pLatch);
-  pBo = Abc_ObjFanout0(pLatch);
-  assert(!Abc_ObjIsComplement(pBi));
-  assert(!Abc_ObjIsComplement(pBo));
-
-  // push bubbles on BO into latch box
-  if (Abc_ObjFaninC0(pBo) && Abc_ObjFanoutNum(pBo) > 0) {
-    bubble = 1;
-    if (Abc_LatchIsInit0(pLatch)) Abc_LatchSetInit1(pLatch);
-    else if (Abc_LatchIsInit1(pLatch)) Abc_LatchSetInit0(pLatch);  
-  }
-
-  // absorb bubbles on BI
-  pBi->fCompl0 ^= bubble ^ Abc_ObjFaninC0(pLatch);
-
-  // convert bubble to INV if not AIG
-  if (!Abc_NtkIsStrash( pNtk ) && Abc_ObjFaninC0(pBi)) {
-    pBi->fCompl0 = 0;
-    pInv = Abc_NtkCreateNodeInv( pNtk, Abc_ObjFanin0(pBi) );
-    Abc_ObjPatchFanin( pBi, Abc_ObjFanin0(pBi), pInv );
-  }
-
-  pBo->fCompl0 = 0;
-  pLatch->fCompl0 = 0;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Marks nodes in TFO/TFI of PI/PO.]
-
-  Description [Sets flow data flag BLOCK appropriately.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_MarkBlocks( Abc_Ntk_t * pNtk ) {
-  int i;
-  Abc_Obj_t *pObj;
-
-  if (pManMR->fIsForward){
-    // --- forward retiming : block TFO of inputs    
-
-    // mark the frontier
-    Abc_NtkForEachPo( pNtk, pObj, i )
-      pObj->fMarkA = 1;
-    Abc_NtkForEachLatch( pNtk, pObj, i )
-      {
-        pObj->fMarkA = 1;
-      }
-    // mark the nodes reachable from the PIs
-    Abc_NtkForEachPi( pNtk, pObj, i )
-      Abc_NtkMarkCone_rec( pObj, pManMR->fIsForward );
-  } else {
-    // --- backward retiming : block TFI of outputs
-
-    // mark the frontier
-    Abc_NtkForEachPi( pNtk, pObj, i )
-      pObj->fMarkA = 1;
-    Abc_NtkForEachLatch( pNtk, pObj, i )
-      {
-        pObj->fMarkA = 1;
-      }
-    // mark the nodes reachable from the POs
-    Abc_NtkForEachPo( pNtk, pObj, i )
-      Abc_NtkMarkCone_rec( pObj, pManMR->fIsForward );
-    // block constant nodes (if enabled)
-    if (pManMR->fBlockConst) {
-      Abc_NtkForEachObj( pNtk, pObj, i )
-        if ((Abc_NtkIsStrash(pNtk) && Abc_AigNodeIsConst(pObj)) ||
-            (!Abc_NtkIsStrash(pNtk) && Abc_NodeIsConst(pObj))) {
-          FSET(pObj, BLOCK);
-        }
-    }
-  }
-
-  // copy marks
-  Abc_NtkForEachObj( pNtk, pObj, i ) {
-    if (pObj->fMarkA) {
-      pObj->fMarkA = 0;
-      if (!Abc_ObjIsLatch(pObj) /* && !Abc_ObjIsPi(pObj) */ )
-        FSET(pObj, BLOCK);
-    }
-  }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Computes maximum flow.]
-
-  Description []
-               
-  SideEffects [Leaves VISITED flags on source-reachable nodes.]
-
-  SeeAlso     []
-
-***********************************************************************/
-int
-Abc_FlowRetime_PushFlows( Abc_Ntk_t * pNtk, int fVerbose ) {
-  int i, j, flow = 0, last, srcDist = 0;
-  Abc_Obj_t   *pObj, *pObj2;
-//  int clk = clock();
-
-  pManMR->constraintMask |= BLOCK;
-
-  pManMR->fSinkDistTerminate = 0;
-  dfsfast_preorder( pNtk );
-
-  // (i) fast max-flow computation
-  while(!pManMR->fSinkDistTerminate && srcDist < MAX_DIST) {
-    srcDist = MAX_DIST;
-    Abc_NtkForEachLatch( pNtk, pObj, i )
-      if (FDATA(pObj)->e_dist)    
-        srcDist = MIN(srcDist, FDATA(pObj)->e_dist);
-    
-    Abc_NtkForEachLatch( pNtk, pObj, i ) {
-      if (srcDist == FDATA(pObj)->e_dist &&
-          dfsfast_e( pObj, NULL )) {
-#ifdef DEBUG_PRINT_FLOWS
-        printf("\n\n");
-#endif
-        flow++;
-      }
-    }
-  }
-
-  if (fVerbose) vprintf("\t\tmax-flow1 = %d \t", flow);
-
-  // (ii) complete max-flow computation
-  // also, marks source-reachable nodes
-  do {
-    last = flow;
-    Abc_NtkForEachLatch( pNtk, pObj, i ) {
-      if (dfsplain_e( pObj, NULL )) {
-#ifdef DEBUG_PRINT_FLOWS
-        printf("\n\n");
-#endif
-        flow++;
-        Abc_NtkForEachObj( pNtk, pObj2, j )
-          FUNSET( pObj2, VISITED );
-      }
-    }
-  } while (flow > last);
-  
-  if (fVerbose) vprintf("max-flow2 = %d\n", flow);
-
-//  PRT( "time", clock() - clk );
-  return flow;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Restores latch boxes.]
-
-  Description [Latchless BI/BO nodes are removed.  Latch boxes are 
-               restored around remaining latches.]
-               
-  SideEffects [Deletes nodes as appropriate.]
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_FixLatchBoxes( Abc_Ntk_t *pNtk, Vec_Ptr_t *vBoxIns ) {
-  int i;
-  Abc_Obj_t *pObj, *pBo = NULL, *pBi = NULL;
-  Vec_Ptr_t *vFreeBi = Vec_PtrAlloc( 100 );
-  Vec_Ptr_t *vFreeBo = Vec_PtrAlloc( 100 );
-
-  // 1. remove empty bi/bo pairs
-  while(Vec_PtrSize( vBoxIns )) {
-    pBi = (Abc_Obj_t *)Vec_PtrPop( vBoxIns );
-    assert(Abc_ObjIsBi(pBi));
-    assert(Abc_ObjFanoutNum(pBi) == 1);
-    // APH: broken by bias nodes assert(Abc_ObjFaninNum(pBi) == 1);
-    pBo = Abc_ObjFanout0(pBi);
-    assert(!Abc_ObjFaninC0(pBo));
-
-    if (Abc_ObjIsBo(pBo)) {
-      // an empty bi/bo pair
-
-      Abc_ObjRemoveFanins( pBo );
-      // transfer complement from BI, if present 
-      assert(!Abc_ObjIsComplement(Abc_ObjFanin0(pBi)));
-      Abc_ObjBetterTransferFanout( pBo, Abc_ObjFanin0(pBi), Abc_ObjFaninC0(pBi) );
-
-      Abc_ObjRemoveFanins( pBi );
-      pBi->fCompl0 = 0;
-      Vec_PtrPush( vFreeBi, pBi );
-      Vec_PtrPush( vFreeBo, pBo );
-
-      // free names
-      if (Nm_ManFindNameById(pNtk->pManName, Abc_ObjId(pBi)))
-        Nm_ManDeleteIdName( pNtk->pManName, Abc_ObjId(pBi));
-      if (Nm_ManFindNameById(pNtk->pManName, Abc_ObjId(pBo)))
-        Nm_ManDeleteIdName( pNtk->pManName, Abc_ObjId(pBo));
-
-      // check for complete detachment
-      assert(Abc_ObjFaninNum(pBi) == 0);
-      assert(Abc_ObjFanoutNum(pBi) == 0);
-      assert(Abc_ObjFaninNum(pBo) == 0);
-      assert(Abc_ObjFanoutNum(pBo) == 0);
-    } else if (Abc_ObjIsLatch(pBo)) {
-    } else {
-      Abc_ObjPrint(stdout, pBi);
-      Abc_ObjPrint(stdout, pBo);
-      assert(0);
-    }
-  }
-
-  // 2. add bi/bos as necessary for latches
-  Abc_NtkForEachLatch( pNtk, pObj, i ) {
-    assert(Abc_ObjFaninNum(pObj) == 1);
-    if (Abc_ObjFanoutNum(pObj))
-      pBo = Abc_ObjFanout0(pObj);
-    else pBo = NULL;
-    pBi = Abc_ObjFanin0(pObj);
-    
-    // add BO
-    if (!pBo || !Abc_ObjIsBo(pBo)) {
-      pBo = (Abc_Obj_t *)Vec_PtrPop( vFreeBo );
-      if (Abc_ObjFanoutNum(pObj))  Abc_ObjTransferFanout( pObj, pBo );
-      Abc_ObjAddFanin( pBo, pObj );
-    }
-    // add BI
-    if (!Abc_ObjIsBi(pBi)) {
-      pBi = (Abc_Obj_t *)Vec_PtrPop( vFreeBi );
-      assert(Abc_ObjFaninNum(pBi) == 0);
-      Abc_ObjAddFanin( pBi, Abc_ObjFanin0(pObj) );
-      pBi->fCompl0 = pObj->fCompl0;
-      Abc_ObjRemoveFanins( pObj );
-      Abc_ObjAddFanin( pObj, pBi );
-    }
-  }
-
-  // delete remaining BIs and BOs
-  while(Vec_PtrSize( vFreeBi )) {
-    pObj = (Abc_Obj_t *)Vec_PtrPop( vFreeBi );
-    Abc_NtkDeleteObj( pObj );
-  }
-  while(Vec_PtrSize( vFreeBo )) {
-    pObj = (Abc_Obj_t *)Vec_PtrPop( vFreeBo );
-    Abc_NtkDeleteObj( pObj );
-  }
-
-#if defined(DEBUG_CHECK)
-  Abc_NtkForEachObj( pNtk, pObj, i ) {
-    if (Abc_ObjIsBo(pObj)) {
-      assert(Abc_ObjFaninNum(pObj) == 1);
-      assert(Abc_ObjIsLatch(Abc_ObjFanin0(pObj))); 
-    }
-    if (Abc_ObjIsBi(pObj)) {
-      assert(Abc_ObjFaninNum(pObj) == 1);
-      assert(Abc_ObjFanoutNum(pObj) == 1);
-      assert(Abc_ObjIsLatch(Abc_ObjFanout0(pObj))); 
-    }
-    if (Abc_ObjIsLatch(pObj)) {
-      assert(Abc_ObjFanoutNum(pObj) == 1);
-      assert(Abc_ObjFaninNum(pObj) == 1);
-    }
-  }
-#endif
-
-  Vec_PtrFree( vFreeBi );
-  Vec_PtrFree( vFreeBo );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks register count along all combinational paths.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_VerifyPathLatencies( Abc_Ntk_t * pNtk ) {
-  int i;
-  Abc_Obj_t *pObj;
-  fPathError = 0;
-
-  vprintf("\t\tVerifying latency along all paths...");
-
-  Abc_NtkForEachObj( pNtk, pObj, i ) {
-    if (Abc_ObjIsBo(pObj)) {
-      Abc_FlowRetime_VerifyPathLatencies_rec( pObj, 0 );
-    } else if (!pManMR->fIsForward && Abc_ObjIsPi(pObj)) {
-      Abc_FlowRetime_VerifyPathLatencies_rec( pObj, 0 );
-    }
-
-    if (fPathError) {
-      if (Abc_ObjFaninNum(pObj) > 0) {
-        printf("fanin ");
-        print_node(Abc_ObjFanin0(pObj));
-      }
-      printf("\n");
-      exit(0);
-    }
-  }
-
-  vprintf(" ok\n");
-
-  Abc_NtkForEachObj( pNtk, pObj, i ) {
-    pObj->fMarkA = 0;
-    pObj->fMarkB = 0;
-    pObj->fMarkC = 0;
-  }
-}
-
-
-int
-Abc_FlowRetime_VerifyPathLatencies_rec( Abc_Obj_t * pObj, int markD ) {
-  int i, j;
-  Abc_Obj_t *pNext;
-  int fCare = 0;
-  int markC = pObj->fMarkC;
-
-  if (!pObj->fMarkB) {
-    pObj->fMarkB = 1; // visited
-    
-    if (Abc_ObjIsLatch(pObj))
-      markC = 1;      // latch in output
-    
-    if (!pManMR->fIsForward && !Abc_ObjIsPo(pObj) && !Abc_ObjFanoutNum(pObj))
-      return -1; // dangling non-PO outputs : don't care what happens
-    
-    Abc_ObjForEachFanout( pObj, pNext, i ) {
-      // reached end of cycle?
-      if ( Abc_ObjIsBo(pNext) ||
-           (pManMR->fIsForward && Abc_ObjIsPo(pNext)) ) {
-        if (!markD && !Abc_ObjIsLatch(pObj)) {
-          printf("\nERROR: no-latch path (end)\n");
-          print_node(pNext);
-          printf("\n");
-          fPathError = 1;
-        }
-      } else if (!pManMR->fIsForward && Abc_ObjIsPo(pNext)) {
-        if (markD || Abc_ObjIsLatch(pObj)) {
-          printf("\nERROR: extra-latch path to outputs\n");
-          print_node(pNext);
-          printf("\n");
-          fPathError = 1;
-        }
-      } else {
-        j = Abc_FlowRetime_VerifyPathLatencies_rec( pNext, markD || Abc_ObjIsLatch(pObj) );
-        if (j >= 0) {
-          markC |= j;
-          fCare = 1;
-        }
-      }
-
-      if (fPathError) {
-        print_node(pObj);
-        printf("\n");
-        return 0;
-      }
-    }
-  }
-
-  if (!fCare) return -1;
-
-  if (markC && markD) {
-    printf("\nERROR: mult-latch path\n");
-    print_node(pObj);
-    printf("\n");
-    fPathError = 1;
-  }
-  if (!markC && !markD) {
-    printf("\nERROR: no-latch path (inter)\n");
-    print_node(pObj);
-    printf("\n");
-    fPathError = 1;
-  }
-
-  return (pObj->fMarkC = markC);
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Copies initial state from latches to BO nodes.]
-
-  Description [Initial states are marked on BO nodes with INIT_0 and
-               INIT_1 flags in their Flow_Data structures.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_CopyInitState( Abc_Obj_t * pSrc, Abc_Obj_t * pDest ) {
-  Abc_Obj_t *pObj;
-
-  if (!pManMR->fComputeInitState) return;
-
-  assert(Abc_ObjIsLatch(pSrc));
-  assert(Abc_ObjFanin0(pDest) == pSrc);
-  assert(!Abc_ObjFaninC0(pDest));
-
-  FUNSET(pDest, INIT_CARE);
-  if (Abc_LatchIsInit0(pSrc)) {
-    FSET(pDest, INIT_0);
-  } else if (Abc_LatchIsInit1(pSrc)) {
-    FSET(pDest, INIT_1);  
-  }
-  
-  if (!pManMR->fIsForward) {
-    pObj = Abc_ObjData(pSrc);
-    assert(Abc_ObjIsPi(pObj));
-    FDATA(pDest)->pInitObj = pObj;
-  }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Implements min-cut.]
-
-  Description [Requires source-reachable nodes to be marked VISITED.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int
-Abc_FlowRetime_ImplementCut( Abc_Ntk_t * pNtk ) {
-  int i, j, cut = 0, unmoved = 0;
-  Abc_Obj_t *pObj, *pReg, *pNext, *pBo = NULL, *pBi = NULL;
-  Vec_Ptr_t *vFreeRegs = Vec_PtrAlloc( Abc_NtkLatchNum(pNtk) );
-  Vec_Ptr_t *vBoxIns = Vec_PtrAlloc( Abc_NtkLatchNum(pNtk) );
-  Vec_Ptr_t *vMove = Vec_PtrAlloc( 100 );
-
-  // remove latches from netlist
-  Abc_NtkForEachLatch( pNtk, pObj, i ) {
-    pBo = Abc_ObjFanout0(pObj);
-    pBi = Abc_ObjFanin0(pObj);
-    assert(Abc_ObjIsBo(pBo) && Abc_ObjIsBi(pBi));
-    Vec_PtrPush( vBoxIns, pBi );
-
-    // copy initial state values to BO
-    Abc_FlowRetime_CopyInitState( pObj, pBo );
-
-    // re-use latch elsewhere
-    Vec_PtrPush( vFreeRegs, pObj );
-    FSET(pBo, CROSS_BOUNDARY);
-
-    // cut out of netlist
-    Abc_ObjPatchFanin( pBo, pObj, pBi );
-    Abc_ObjRemoveFanins( pObj );
-
-    // free name
-    if (Nm_ManFindNameById(pNtk->pManName, Abc_ObjId(pObj)))
-      Nm_ManDeleteIdName( pNtk->pManName, Abc_ObjId(pObj));
-  }
-
-  // insert latches into netlist
-  Abc_NtkForEachObj( pNtk, pObj, i ) {
-    if (Abc_ObjIsLatch( pObj )) continue;
-    if (FTEST(pObj, BIAS_NODE)) continue;
-    
-    // a latch is required on every node that lies across the min-cit
-    assert(!pManMR->fIsForward || !FTEST(pObj, VISITED_E) || FTEST(pObj, VISITED_R));
-    if (FTEST(pObj, VISITED_R) && !FTEST(pObj, VISITED_E)) {
-      assert(FTEST(pObj, FLOW));
-
-      // count size of cut
-      cut++;
-      if ((pManMR->fIsForward && Abc_ObjIsBo(pObj)) || 
-          (!pManMR->fIsForward && Abc_ObjIsBi(pObj)))
-        unmoved++;
-      
-      // only insert latch between fanouts that lie across min-cut
-      // some fanout paths may be cut at deeper points
-      Abc_ObjForEachFanout( pObj, pNext, j )
-        if (Abc_FlowRetime_IsAcrossCut( pObj, pNext ))
-          Vec_PtrPush(vMove, pNext);
-
-      // check that move-set is non-zero
-      if (Vec_PtrSize(vMove) == 0)
-        print_node(pObj);
-      assert(Vec_PtrSize(vMove) > 0);
-      
-      // insert one of re-useable registers
-      assert(Vec_PtrSize( vFreeRegs ));
-      pReg = (Abc_Obj_t *)Vec_PtrPop( vFreeRegs );
-      
-      Abc_ObjAddFanin(pReg, pObj);
-      while(Vec_PtrSize( vMove )) {
-        pNext = (Abc_Obj_t *)Vec_PtrPop( vMove );
-        Abc_ObjPatchFanin( pNext, pObj, pReg );
-        if (Abc_ObjIsBi(pNext)) assert(Abc_ObjFaninNum(pNext) == 1);
-
-      }
-      // APH: broken by bias nodes  if (Abc_ObjIsBi(pObj)) assert(Abc_ObjFaninNum(pObj) == 1);
-    }
-  }
-
-#if defined(DEBUG_CHECK)        
-  Abc_FlowRetime_VerifyPathLatencies( pNtk );
-#endif
-
-  // delete remaining latches
-  while(Vec_PtrSize( vFreeRegs )) {
-    pReg = (Abc_Obj_t *)Vec_PtrPop( vFreeRegs );
-    Abc_NtkDeleteObj( pReg );
-  }
-  
-  // update initial states
-  Abc_FlowRetime_UpdateLags( );
-  Abc_FlowRetime_InitState( pNtk );
-
-  // restore latch boxes
-  Abc_FlowRetime_FixLatchBoxes( pNtk, vBoxIns );
-
-  Vec_PtrFree( vFreeRegs );
-  Vec_PtrFree( vMove );
-  Vec_PtrFree( vBoxIns );
-
-  vprintf("\t\tmin-cut = %d (unmoved = %d)\n", cut, unmoved);
-  return cut;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Adds dummy fanin.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_AddDummyFanin( Abc_Obj_t * pObj ) {
-  Abc_Ntk_t *pNtk = Abc_ObjNtk( pObj );
-
-  if (Abc_NtkIsStrash(pNtk)) 
-    Abc_ObjAddFanin(pObj, Abc_AigConst1( pNtk ));
-  else
-    Abc_ObjAddFanin(pObj, Abc_NtkCreateNodeConst0( pNtk ));
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Prints information about a node.]
-
-  Description [Debuging.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-print_node(Abc_Obj_t *pObj) {
-  int i;
-  Abc_Obj_t * pNext;
-  char m[6];
-
-  m[0] = 0;
-  if (pObj->fMarkA)
-    strcat(m, "A");
-  if (pObj->fMarkB)
-    strcat(m, "B");
-  if (pObj->fMarkC)
-    strcat(m, "C");
-
-  printf("node %d type=%d lev=%d tedge=%d (%x%s) fanouts {", Abc_ObjId(pObj), Abc_ObjType(pObj),
-         pObj->Level, Vec_PtrSize(FTIMEEDGES(pObj)), FDATA(pObj)->mark, m);
-  Abc_ObjForEachFanout( pObj, pNext, i )
-    printf("%d[%d](%d),", Abc_ObjId(pNext), Abc_ObjType(pNext), FDATA(pNext)->mark);
-  printf("} fanins {");
-  Abc_ObjForEachFanin( pObj, pNext, i )
-    printf("%d[%d](%d),", Abc_ObjId(pNext), Abc_ObjType(pNext), FDATA(pNext)->mark);
-  printf("}\n");
-}
-
-void
-print_node2(Abc_Obj_t *pObj) {
-  int i;
-  Abc_Obj_t * pNext;
-  char m[6];
-
-  m[0] = 0;
-  if (pObj->fMarkA)
-    strcat(m, "A");
-  if (pObj->fMarkB)
-    strcat(m, "B");
-  if (pObj->fMarkC)
-    strcat(m, "C");
-
-  printf("node %d type=%d %s fanouts {", Abc_ObjId(pObj), Abc_ObjType(pObj), m);
-  Abc_ObjForEachFanout( pObj, pNext, i )
-    printf("%d ,", Abc_ObjId(pNext));
-  printf("} fanins {");
-  Abc_ObjForEachFanin( pObj, pNext, i )
-    printf("%d ,", Abc_ObjId(pNext));
-  printf("} ");
-}
-
-void
-print_node3(Abc_Obj_t *pObj) {
-  int i;
-  Abc_Obj_t * pNext;
-  char m[6];
-
-  m[0] = 0;
-  if (pObj->fMarkA)
-    strcat(m, "A");
-  if (pObj->fMarkB)
-    strcat(m, "B");
-  if (pObj->fMarkC)
-    strcat(m, "C");
-
-  printf("\nnode %d type=%d mark=%d %s\n", Abc_ObjId(pObj), Abc_ObjType(pObj), FDATA(pObj)->mark, m);
-  printf("fanouts\n");
-  Abc_ObjForEachFanout( pObj, pNext, i ) {
-    print_node(pNext);
-    printf("\n");
-  }
-  printf("fanins\n");
-  Abc_ObjForEachFanin( pObj, pNext, i ) {
-    print_node(pNext);
-    printf("\n");
-  }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Transfers fanout.]
-
-  Description [Does not produce an error if there is no fanout.
-               Complements as necessary.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void 
-Abc_ObjBetterTransferFanout( Abc_Obj_t * pFrom, Abc_Obj_t * pTo, int compl ) {
-  Abc_Obj_t *pNext;
-  
-  while(Abc_ObjFanoutNum(pFrom) > 0) {
-    pNext = Abc_ObjFanout0(pFrom);
-    Abc_ObjPatchFanin( pNext, pFrom, Abc_ObjNotCond(pTo, compl) );
-  }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns true is a connection spans the min-cut.]
-
-  Description [pNext is a direct fanout of pObj.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int
-Abc_FlowRetime_IsAcrossCut( Abc_Obj_t *pObj, Abc_Obj_t *pNext ) {
-
-  if (FTEST(pObj, VISITED_R) && !FTEST(pObj, VISITED_E)) {
-    if (pManMR->fIsForward) {
-      if (!FTEST(pNext, VISITED_R) || 
-          (FTEST(pNext, BLOCK_OR_CONS) & pManMR->constraintMask)|| 
-          FTEST(pNext, CROSS_BOUNDARY) || 
-          Abc_ObjIsLatch(pNext))
-        return 1;
-    } else {
-      if (FTEST(pNext, VISITED_E) ||
-          FTEST(pNext, CROSS_BOUNDARY))
-        return 1;
-    }
-  }
-  
-  return 0;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Resets flow problem]
-
-  Description [If fClearAll is true, all marks will be cleared; this is
-               typically appropriate after the circuit structure has
-               been modified.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Abc_FlowRetime_ClearFlows( int fClearAll ) {
-  int i;
-
-  if (fClearAll)
-    memset(pManMR->pDataArray, 0, sizeof(Flow_Data_t)*pManMR->nNodes);
-  else {
-    // clear only data related to flow problem
-    for(i=0; i<pManMR->nNodes; i++) {
-      pManMR->pDataArray[i].mark &= ~(VISITED | FLOW );
-      pManMR->pDataArray[i].e_dist = 0;
-      pManMR->pDataArray[i].r_dist = 0;
-      pManMR->pDataArray[i].pred = NULL;
-    }
-  }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Duplicates network.]
-
-  Description [Duplicates any type of network. Preserves copy data.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-static Abc_Ntk_t* Abc_FlowRetime_NtkDup( Abc_Ntk_t * pNtk ) {
-  Abc_Ntk_t *pNtkCopy;
-  Abc_Obj_t *pObj, *pObjCopy, *pNext, *pNextCopy;
-  int i, j;
-
-  pNtkCopy = Abc_NtkAlloc( pNtk->ntkType, pNtk->ntkFunc, 1 );
-  pNtkCopy->pName = Extra_UtilStrsav(pNtk->pName);
-  pNtkCopy->pSpec = Extra_UtilStrsav(pNtk->pSpec);
-
-  // copy each object
-  Abc_NtkForEachObj( pNtk, pObj, i) {
-
-    if (Abc_NtkIsStrash( pNtk ) && Abc_AigNodeIsConst( pObj ))
-      pObjCopy = Abc_AigConst1( pNtkCopy );
-    else
-      pObjCopy = Abc_NtkDupObj( pNtkCopy, pObj, 0 );
-
-    FDATA( pObj )->pCopy = pObjCopy;
-    FDATA( pObj )->mark = 0;
-
-    // assert( pManMR->fIsForward || pObj->Id == pObjCopy->Id );
-
-    // copy complementation
-    pObjCopy->fCompl0 = pObj->fCompl0;
-    pObjCopy->fCompl1 = pObj->fCompl1;
-    pObjCopy->fPhase = pObj->fPhase;
-  }
-
-  // connect fanin
-  Abc_NtkForEachObj( pNtk, pObj, i) {
-    pObjCopy = FDATA(pObj)->pCopy;
-    assert(pObjCopy);
-    Abc_ObjForEachFanin( pObj, pNext, j ) {
-      pNextCopy = FDATA(pNext)->pCopy;
-      assert(pNextCopy);
-      assert(pNext->Type == pNextCopy->Type);
-
-      Abc_ObjAddFanin(pObjCopy, pNextCopy);
-    }
-  }
-
-#if defined(DEBUG_CHECK) || 1
-  Abc_NtkForEachObj( pNtk, pObj, i) { 
-    pObjCopy = FDATA(pObj)->pCopy;
-    assert( Abc_ObjFanoutNum( pObj ) ==  Abc_ObjFanoutNum( pObjCopy ) );
-    assert( Abc_ObjFaninNum( pObj ) ==  Abc_ObjFaninNum( pObjCopy ) );
-  }
-#endif
-
-  assert(Abc_NtkObjNum( pNtk )   == Abc_NtkObjNum( pNtkCopy ) );
-  assert(Abc_NtkLatchNum( pNtk ) == Abc_NtkLatchNum( pNtkCopy ) );
-  assert(Abc_NtkPoNum( pNtk )    == Abc_NtkPoNum( pNtkCopy ) );
-  assert(Abc_NtkPiNum( pNtk )    == Abc_NtkPiNum( pNtkCopy ) );
-
-  return pNtkCopy;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Silent restrash.]
-
-  Description [Same functionality as Abc_NtkRestrash but w/o warnings.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Abc_Ntk_t * Abc_FlowRetime_NtkSilentRestrash( Abc_Ntk_t * pNtk, int fCleanup )
-{
-    Abc_Ntk_t * pNtkAig;
-    Abc_Obj_t * pObj;
-    int i, nNodes;//, RetValue;
-    assert( Abc_NtkIsStrash(pNtk) );
-    // start the new network (constants and CIs of the old network will point to the their counterparts in the new network)
-    pNtkAig = Abc_NtkStartFrom( pNtk, ABC_NTK_STRASH, ABC_FUNC_AIG );
-    // restrash the nodes (assuming a topological order of the old network)
-    Abc_NtkForEachNode( pNtk, pObj, i )
-        pObj->pCopy = Abc_AigAnd( (Abc_Aig_t *)pNtkAig->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
-    // finalize the network
-    Abc_NtkFinalize( pNtk, pNtkAig );
-    // perform cleanup if requested
-    if ( fCleanup )
-      nNodes = Abc_AigCleanup((Abc_Aig_t *)pNtkAig->pManFunc);
-    // duplicate EXDC 
-    if ( pNtk->pExdc )
-      pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc );
-    // make sure everything is okay
-    if ( !Abc_NtkCheck( pNtkAig ) )
-      {
-        printf( "Abc_NtkStrash: The network check has failed.\n" );
-        Abc_NtkDelete( pNtkAig );
-        return NULL;
-      }
-    return pNtkAig;
-}
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Updates lag values.]
-
-  Description [Recursive.  Forward retiming.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_UpdateLags_forw_rec( Abc_Obj_t *pObj ) {
-  Abc_Obj_t *pNext;
-  int i;
-
-  assert(!Abc_ObjIsPi(pObj));
-  assert(!Abc_ObjIsLatch(pObj));
-
-  if (Abc_ObjIsBo(pObj)) return;
-  if (Abc_NodeIsTravIdCurrent(pObj)) return;
-
-  Abc_NodeSetTravIdCurrent(pObj);
-
-  if (Abc_ObjIsNode(pObj)) {
-    Abc_FlowRetime_SetLag( pObj, -1+Abc_FlowRetime_GetLag(pObj) );
-  }
-
-  Abc_ObjForEachFanin( pObj, pNext, i ) {
-    Abc_FlowRetime_UpdateLags_forw_rec( pNext );
-  }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Updates lag values.]
-
-  Description [Recursive.  Backward retiming.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_UpdateLags_back_rec( Abc_Obj_t *pObj ) {
-  Abc_Obj_t *pNext;
-  int i;
-
-  assert(!Abc_ObjIsPo(pObj));
-  assert(!Abc_ObjIsLatch(pObj));
-
-  if (Abc_ObjIsBo(pObj)) return;
-  if (Abc_NodeIsTravIdCurrent(pObj)) return;
-
-  Abc_NodeSetTravIdCurrent(pObj);
-
-  if (Abc_ObjIsNode(pObj)) {
-    Abc_FlowRetime_SetLag( pObj, 1+Abc_FlowRetime_GetLag(pObj) );
-  }
-
-  Abc_ObjForEachFanout( pObj, pNext, i ) {
-    Abc_FlowRetime_UpdateLags_back_rec( pNext );
-  }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Updates lag values.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void
-Abc_FlowRetime_UpdateLags( ) {
-  Abc_Obj_t *pObj, *pNext;
-  int i, j;
-
-  Abc_NtkIncrementTravId( pManMR->pNtk );
-
-  Abc_NtkForEachLatch( pManMR->pNtk, pObj, i )
-    if (pManMR->fIsForward) {
-      Abc_ObjForEachFanin( pObj, pNext, j )          
-        Abc_FlowRetime_UpdateLags_forw_rec( pNext );
-    } else {
-      Abc_ObjForEachFanout( pObj, pNext, j )          
-        Abc_FlowRetime_UpdateLags_back_rec( pNext );
-    }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Gets lag value of a node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int 
-Abc_FlowRetime_GetLag( Abc_Obj_t *pObj ) {
-  assert( !Abc_ObjIsLatch(pObj) );
-  assert( Abc_ObjId(pObj) < Vec_IntSize(pManMR->vLags) );
-
-  return Vec_IntEntry(pManMR->vLags, Abc_ObjId(pObj));
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sets lag value of a node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void 
-Abc_FlowRetime_SetLag( Abc_Obj_t *pObj, int lag ) {
-  assert( Abc_ObjIsNode(pObj) );
-  assert( Abc_ObjId(pObj) < Vec_IntSize(pManMR->vLags) );
-
-  Vec_IntWriteEntry(pManMR->vLags, Abc_ObjId(pObj), lag);
-}
-
-
-static void Abc_ObjPrintNeighborhood_rec( Abc_Obj_t *pObj, Vec_Ptr_t *vNodes, int depth ) {
-  Abc_Obj_t *pObj2;
-  int i;
-  
-  if (pObj->fMarkC || depth < 0) return;
-
-  pObj->fMarkC = 1;
-  Vec_PtrPush( vNodes, pObj );
-
-  Abc_ObjPrint( stdout, pObj );
-
-  Abc_ObjForEachFanout(pObj, pObj2, i) {
-    Abc_ObjPrintNeighborhood_rec( pObj2, vNodes, depth-1 );
-  }
-  Abc_ObjForEachFanin(pObj, pObj2, i) {
-    Abc_ObjPrintNeighborhood_rec( pObj2, vNodes, depth-1 );
-  }
-}
-
-void Abc_ObjPrintNeighborhood( Abc_Obj_t *pObj, int depth ) {
-  Vec_Ptr_t *vNodes = Vec_PtrAlloc(100); 
-  Abc_Obj_t *pObj2;
-
-  Abc_ObjPrintNeighborhood_rec( pObj, vNodes, depth );
-
-  while(Vec_PtrSize(vNodes)) {
-    pObj2 = Vec_PtrPop(vNodes);
-    pObj2->fMarkC = 0;
-  }
-
-  Vec_PtrFree(vNodes);
-}
-ABC_NAMESPACE_IMPL_END
-