Improvements to gate sizing.

7 files changed, 221 insertions, 163 deletions

diff --git a/src/base/abc/abcHie.c b/src/base/abc/abcHie.c
index 73b08fcc..886056e2 100644
--- a/src/base/abc/abcHie.c
+++ b/src/base/abc/abcHie.c
@@ -436,7 +436,7 @@ void Abc_NtkPrintBoxInfo( Abc_Ntk_t * pNtk )
     int i, k, Num;
     if ( pNtk->pDesign == NULL || pNtk->pDesign->vModules == NULL )
     {
-        printf( "There is no hierarchy information.\n" );
+//        printf( "There is no hierarchy information.\n" );
         return;
     }
     // sort models by name
diff --git a/src/map/scl/scl.c b/src/map/scl/scl.c
index fb11311f..f9d88c45 100644
--- a/src/map/scl/scl.c
+++ b/src/map/scl/scl.c
@@ -63,9 +63,9 @@ void Scl_Init( Abc_Frame_t * pAbc )
     Cmd_CommandAdd( pAbc, "SCL mapping",  "stime",      Scl_CommandStime,    0 ); 
     Cmd_CommandAdd( pAbc, "SCL mapping",  "topo",       Scl_CommandTopo,     1 ); 
     Cmd_CommandAdd( pAbc, "SCL mapping",  "buffer",     Scl_CommandBuffer,   1 ); 
+    Cmd_CommandAdd( pAbc, "SCL mapping",  "minsize",    Scl_CommandMinsize,  1 ); 
     Cmd_CommandAdd( pAbc, "SCL mapping",  "gsize",      Scl_CommandGsize,    1 ); 
     Cmd_CommandAdd( pAbc, "SCL mapping",  "upsize",     Scl_CommandUpsize,   1 ); 
-    Cmd_CommandAdd( pAbc, "SCL mapping",  "minsize",    Scl_CommandMinsize,  1 ); 
 }
 void Scl_End( Abc_Frame_t * pAbc )
 {
@@ -510,10 +510,73 @@ usage:
   SeeAlso     []
 
 ***********************************************************************/
+int Scl_CommandMinsize( Abc_Frame_t * pAbc, int argc, char **argv )
+{
+    Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
+    int c, fVerbose = 0;
+    Extra_UtilGetoptReset();
+    while ( ( c = Extra_UtilGetopt( argc, argv, "vh" ) ) != EOF )
+    {
+        switch ( c )
+        {
+        case 'v':
+            fVerbose ^= 1;
+            break;
+        case 'h':
+            goto usage;
+        default:
+            goto usage;
+        }
+    }
+
+    if ( Abc_FrameReadNtk(pAbc) == NULL )
+    {
+        fprintf( pAbc->Err, "There is no current network.\n" );
+        return 1;
+    }
+    if ( !Abc_NtkHasMapping(Abc_FrameReadNtk(pAbc)) )
+    {
+        fprintf( pAbc->Err, "The current network is not mapped.\n" );
+        return 1;
+    }
+    if ( !Abc_SclCheckNtk(Abc_FrameReadNtk(pAbc), 0) )
+    {
+        fprintf( pAbc->Err, "The current networks is not in a topo order (run \"topo\").\n" );
+        return 1;
+    }
+    if ( pAbc->pLibScl == NULL )
+    {
+        fprintf( pAbc->Err, "There is no Liberty library available.\n" );
+        return 1;
+    }
+
+    Abc_SclMinsizePerform( (SC_Lib *)pAbc->pLibScl, pNtk, fVerbose );
+    return 0;
+
+usage:
+    fprintf( pAbc->Err, "usage: minsize [-vh]\n" );
+    fprintf( pAbc->Err, "\t           downsized all gates to their minimum size\n" );
+    fprintf( pAbc->Err, "\t-v       : toggle printing verbose information [default = %s]\n", fVerbose? "yes": "no" );
+    fprintf( pAbc->Err, "\t-h       : print the command usage\n");
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
 int Scl_CommandGsize( Abc_Frame_t * pAbc, int argc, char **argv )
 {
     SC_SizePars Pars, * pPars = &Pars;
     int c;
+    memset( pPars, 0, sizeof(SC_SizePars) );
     pPars->nSteps        = 1000000;
     pPars->nRange        = 0;
     pPars->nRangeF       = 10;
@@ -623,8 +686,8 @@ usage:
     fprintf( pAbc->Err, "usage: gsize [-NWUT num] [-acpvwh]\n" );
     fprintf( pAbc->Err, "\t           performs gate sizing using Liberty library\n" );
     fprintf( pAbc->Err, "\t-N <num> : the number of gate-sizing steps performed [default = %d]\n", pPars->nSteps );
-    fprintf( pAbc->Err, "\t-W <num> : delay window (in percents) of near-critical COs [default = %d]\n", pPars->nRange );
-    fprintf( pAbc->Err, "\t-U <num> : delay window (in percents) of near-critical fanins [default = %d]\n", pPars->nRangeF );
+    fprintf( pAbc->Err, "\t-W <num> : delay window (in percent) of near-critical COs [default = %d]\n", pPars->nRange );
+    fprintf( pAbc->Err, "\t-U <num> : delay window (in percent) of near-critical fanins [default = %d]\n", pPars->nRangeF );
     fprintf( pAbc->Err, "\t-T <num> : an approximate timeout, in seconds [default = %d]\n", pPars->nTimeOut );
     fprintf( pAbc->Err, "\t-a       : try resizing all gates (not only critical) [default = %s]\n", pPars->fTryAll? "yes": "no" );
     fprintf( pAbc->Err, "\t-c       : toggle using wire-loads if specified [default = %s]\n", pPars->fUseWireLoads? "yes": "no" );
@@ -648,18 +711,22 @@ usage:
 ***********************************************************************/
 int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
 {
+    SC_UpSizePars Pars, * pPars = &Pars;
     Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
-    int nIters  = 1000;
-    int nIterNoChange = 50;
-    int Window  =   2;
-    int Ratio   =  10;
-    int Notches =  10;
-    int TimeOut =   0;
-    int fDumpStats = 0;
-    int c, fVerbose = 0;
-    int fVeryVerbose = 0;
+    int c;
+    memset( pPars, 0, sizeof(SC_UpSizePars) );
+    pPars->nIters        = 1000;
+    pPars->nIterNoChange =   50;
+    pPars->Window        =    2;
+    pPars->Ratio         =   10;
+    pPars->Notches       =   20;
+    pPars->TimeOut       =    0;
+    pPars->fUseDept      =    1;
+    pPars->fDumpStats    =    0;
+    pPars->fVerbose      =    0;
+    pPars->fVeryVerbose  =    0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "IJWRNTdvwh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "IJWRNTsdvwh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -669,9 +736,9 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
                 Abc_Print( -1, "Command line switch \"-I\" should be followed by a positive integer.\n" );
                 goto usage;
             }
-            nIterNoChange = atoi(argv[globalUtilOptind]);
+            pPars->nIters = atoi(argv[globalUtilOptind]);
             globalUtilOptind++;
-            if ( nIterNoChange < 0 ) 
+            if ( pPars->nIters < 0 ) 
                 goto usage;
             break;
         case 'J':
@@ -680,9 +747,9 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
                 Abc_Print( -1, "Command line switch \"-J\" should be followed by a positive integer.\n" );
                 goto usage;
             }
-            nIters = atoi(argv[globalUtilOptind]);
+            pPars->nIterNoChange = atoi(argv[globalUtilOptind]);
             globalUtilOptind++;
-            if ( nIters < 0 ) 
+            if ( pPars->nIterNoChange < 0 ) 
                 goto usage;
             break;
         case 'W':
@@ -691,9 +758,9 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
                 Abc_Print( -1, "Command line switch \"-W\" should be followed by a positive integer.\n" );
                 goto usage;
             }
-            Window = atoi(argv[globalUtilOptind]);
+            pPars->Window = atoi(argv[globalUtilOptind]);
             globalUtilOptind++;
-            if ( Window < 0 ) 
+            if ( pPars->Window < 0 ) 
                 goto usage;
             break;
         case 'R':
@@ -702,9 +769,9 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
                 Abc_Print( -1, "Command line switch \"-R\" should be followed by a positive integer.\n" );
                 goto usage;
             }
-            Ratio = atoi(argv[globalUtilOptind]);
+            pPars->Ratio = atoi(argv[globalUtilOptind]);
             globalUtilOptind++;
-            if ( Ratio < 0 ) 
+            if ( pPars->Ratio < 0 ) 
                 goto usage;
             break;
         case 'N':
@@ -713,9 +780,9 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
                 Abc_Print( -1, "Command line switch \"-N\" should be followed by a positive integer.\n" );
                 goto usage;
             }
-            Notches = atoi(argv[globalUtilOptind]);
+            pPars->Notches = atoi(argv[globalUtilOptind]);
             globalUtilOptind++;
-            if ( Notches < 0 ) 
+            if ( pPars->Notches < 0 ) 
                 goto usage;
             break;
         case 'T':
@@ -724,19 +791,22 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
                 Abc_Print( -1, "Command line switch \"-T\" should be followed by a positive integer.\n" );
                 goto usage;
             }
-            TimeOut = atoi(argv[globalUtilOptind]);
+            pPars->TimeOut = atoi(argv[globalUtilOptind]);
             globalUtilOptind++;
-            if ( TimeOut < 0 ) 
+            if ( pPars->TimeOut < 0 ) 
                 goto usage;
             break;
+        case 's':
+            pPars->fUseDept ^= 1;
+            break;
         case 'd':
-            fDumpStats ^= 1;
+            pPars->fDumpStats ^= 1;
             break;
         case 'v':
-            fVerbose ^= 1;
+            pPars->fVerbose ^= 1;
             break;
         case 'w':
-            fVeryVerbose ^= 1;
+            pPars->fVeryVerbose ^= 1;
             break;
         case 'h':
             goto usage;
@@ -766,83 +836,22 @@ int Scl_CommandUpsize( Abc_Frame_t * pAbc, int argc, char **argv )
         return 1;
     }
 
-    Abc_SclUpsizePerform( (SC_Lib *)pAbc->pLibScl, pNtk, nIters, nIterNoChange, Window, Ratio, Notches, TimeOut, fDumpStats, fVerbose, fVeryVerbose );
+    Abc_SclUpsizePerform( (SC_Lib *)pAbc->pLibScl, pNtk, pPars );
     return 0;
 
 usage:
     fprintf( pAbc->Err, "usage: upsize [-IJWRNT num] [-dvwh]\n" );
-    fprintf( pAbc->Err, "\t           selectively increases gate sizes in timing-critical regions\n" );
-    fprintf( pAbc->Err, "\t-I <num> : the number of upsizing iterations to perform [default = %d]\n", nIters );
-    fprintf( pAbc->Err, "\t-J <num> : the number of iterations without improvement [default = %d]\n", nIterNoChange );
-    fprintf( pAbc->Err, "\t-W <num> : delay window (in percents) of near-critical COs [default = %d]\n", Window );
-    fprintf( pAbc->Err, "\t-R <num> : ratio of critical nodes (in percents) to update [default = %d]\n", Ratio );
-    fprintf( pAbc->Err, "\t-N <num> : limit on discrete upsizing steps at a node [default = %d]\n", Notches );
-    fprintf( pAbc->Err, "\t-T <num> : approximate timeout in seconds [default = %d]\n", TimeOut );
-    fprintf( pAbc->Err, "\t-d       : toggle dumping statistics into a file [default = %s]\n", fDumpStats? "yes": "no" );
-    fprintf( pAbc->Err, "\t-v       : toggle printing verbose information [default = %s]\n", fVerbose? "yes": "no" );
-    fprintf( pAbc->Err, "\t-w       : toggle printing more verbose information [default = %s]\n", fVeryVerbose? "yes": "no" );
-    fprintf( pAbc->Err, "\t-h       : print the command usage\n");
-    return 1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Scl_CommandMinsize( Abc_Frame_t * pAbc, int argc, char **argv )
-{
-    Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
-    int c, fVerbose = 0;
-    Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "vh" ) ) != EOF )
-    {
-        switch ( c )
-        {
-        case 'v':
-            fVerbose ^= 1;
-            break;
-        case 'h':
-            goto usage;
-        default:
-            goto usage;
-        }
-    }
-
-    if ( Abc_FrameReadNtk(pAbc) == NULL )
-    {
-        fprintf( pAbc->Err, "There is no current network.\n" );
-        return 1;
-    }
-    if ( !Abc_NtkHasMapping(Abc_FrameReadNtk(pAbc)) )
-    {
-        fprintf( pAbc->Err, "The current network is not mapped.\n" );
-        return 1;
-    }
-    if ( !Abc_SclCheckNtk(Abc_FrameReadNtk(pAbc), 0) )
-    {
-        fprintf( pAbc->Err, "The current networks is not in a topo order (run \"topo\").\n" );
-        return 1;
-    }
-    if ( pAbc->pLibScl == NULL )
-    {
-        fprintf( pAbc->Err, "There is no Liberty library available.\n" );
-        return 1;
-    }
-
-    Abc_SclMinsizePerform( (SC_Lib *)pAbc->pLibScl, pNtk, fVerbose );
-    return 0;
-
-usage:
-    fprintf( pAbc->Err, "usage: minsize [-vh]\n" );
-    fprintf( pAbc->Err, "\t           downsized all gates to their minimum size\n" );
-    fprintf( pAbc->Err, "\t-v       : toggle printing verbose information [default = %s]\n", fVerbose? "yes": "no" );
+    fprintf( pAbc->Err, "\t           selectively increases gate sizes on the critical path\n" );
+    fprintf( pAbc->Err, "\t-I <num> : the number of upsizing iterations to perform [default = %d]\n", pPars->nIters );
+    fprintf( pAbc->Err, "\t-J <num> : the number of iterations without improvement to stop [default = %d]\n", pPars->nIterNoChange );
+    fprintf( pAbc->Err, "\t-W <num> : delay window (in percent) of near-critical COs [default = %d]\n", pPars->Window );
+    fprintf( pAbc->Err, "\t-R <num> : ratio of critical nodes (in percent) to update [default = %d]\n", pPars->Ratio );
+    fprintf( pAbc->Err, "\t-N <num> : limit on discrete upsizing steps at a node [default = %d]\n", pPars->Notches );
+    fprintf( pAbc->Err, "\t-T <num> : approximate timeout in seconds [default = %d]\n", pPars->TimeOut );
+    fprintf( pAbc->Err, "\t-s       : toggle using slack based on departure times [default = %s]\n", pPars->fUseDept? "yes": "no" );
+    fprintf( pAbc->Err, "\t-d       : toggle dumping statistics into a file [default = %s]\n", pPars->fDumpStats? "yes": "no" );
+    fprintf( pAbc->Err, "\t-v       : toggle printing verbose information [default = %s]\n", pPars->fVerbose? "yes": "no" );
+    fprintf( pAbc->Err, "\t-w       : toggle printing more verbose information [default = %s]\n", pPars->fVeryVerbose? "yes": "no" );
     fprintf( pAbc->Err, "\t-h       : print the command usage\n");
     return 1;
 }
diff --git a/src/map/scl/sclInt.h b/src/map/scl/sclInt.h
index da997d98..5a9336d8 100644
--- a/src/map/scl/sclInt.h
+++ b/src/map/scl/sclInt.h
@@ -74,6 +74,21 @@ struct SC_SizePars_
     int        fVeryVerbose;
 };
 
+typedef struct SC_UpSizePars_    SC_UpSizePars;
+struct SC_UpSizePars_
+{
+    int        nIters;
+    int        nIterNoChange;
+    int        Window;
+    int        Ratio;
+    int        Notches;
+    int        TimeOut;
+    int        fUseDept;
+    int        fDumpStats;
+    int        fVerbose;
+    int        fVeryVerbose;
+};
+
 ////////////////////////////////////////////////////////////////////////
 ///                    STRUCTURE DEFINITIONS                         ///
 ////////////////////////////////////////////////////////////////////////
@@ -439,7 +454,7 @@ extern void          Abc_SclTimePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fU
 /*=== sclSize.c ===============================================================*/
 extern void          Abc_SclSizingPerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, SC_SizePars * p );
 /*=== sclUpsize.c ===============================================================*/
-extern void          Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int nIters, int nIterNoChange, int Window, int Ratio, int Notches, int TimeOut, int fDumpStats, int fVerbose, int fVeryVerbose );
+extern void          Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, SC_UpSizePars * pPars );
 /*=== sclUtil.c ===============================================================*/
 extern void          Abc_SclHashCells( SC_Lib * p );
 extern int           Abc_SclCellFind( SC_Lib * p, char * pName );
diff --git a/src/map/scl/sclMan.h b/src/map/scl/sclMan.h
index c8fb2ebd..155dccc4 100644
--- a/src/map/scl/sclMan.h
+++ b/src/map/scl/sclMan.h
@@ -64,6 +64,7 @@ struct SC_Man_
     SC_Pair *      pSlews;        // slews for each gate
     SC_Pair *      pTimes2;       // arrivals for each gate
     SC_Pair *      pSlews2;       // slews for each gate
+    float *        pSlack;        // slacks for each gate
     Vec_Flt_t *    vTimesOut;     // output arrival times
     Vec_Que_t *    vQue;          // outputs by their time
     SC_WireLoad *  pWLoadUsed;    // name of the used WireLoad model
@@ -147,6 +148,7 @@ static inline SC_Man * Abc_SclManAlloc( SC_Lib * pLib, Abc_Ntk_t * pNtk )
     p->pSlews    = ABC_CALLOC( SC_Pair, p->nObjs );
     p->pTimes2   = ABC_CALLOC( SC_Pair, p->nObjs );
     p->pSlews2   = ABC_CALLOC( SC_Pair, p->nObjs );
+    p->pSlack    = ABC_FALLOC( float, p->nObjs );
     p->vTimesOut = Vec_FltStart( Abc_NtkCoNum(pNtk) );
     p->vQue      = Vec_QueAlloc( Abc_NtkCoNum(pNtk) );
     Vec_QueSetCosts( p->vQue, Vec_FltArray(p->vTimesOut) );
@@ -182,6 +184,7 @@ static inline void Abc_SclManFree( SC_Man * p )
     ABC_FREE( p->pSlews );
     ABC_FREE( p->pTimes2 );
     ABC_FREE( p->pSlews2 );
+    ABC_FREE( p->pSlack );
     ABC_FREE( p );
 }
 static inline void Abc_SclManCleanTime( SC_Man * p )
@@ -300,6 +303,10 @@ static inline float Abc_SclGetMaxDelayNodeFanins( SC_Man * p, Abc_Obj_t * pNode
         fMaxArr = Abc_MaxFloat( fMaxArr, Abc_SclObjTimeMax(p, pObj) );
     return fMaxArr;
 }
+static inline float Abc_SclReadMaxDelay( SC_Man * p )
+{
+    return Abc_SclObjTimeMax( p, Abc_NtkPo(p->pNtk, Vec_QueTop(p->vQue)) );
+}
 
 /**Function*************************************************************
 
@@ -340,8 +347,8 @@ static inline void Abc_SclDumpStats( SC_Man * p, char * pFileName, clock_t Time
     fprintf( pTable, "%d ", Abc_NtkPiNum(p->pNtk) );
     fprintf( pTable, "%d ", Abc_NtkPoNum(p->pNtk) );
     fprintf( pTable, "%d ", Abc_NtkNodeNum(p->pNtk) );
-    fprintf( pTable, "%d ", (int)p->SumArea0 );
-    fprintf( pTable, "%d ", (int)p->MaxDelay0 );
+    fprintf( pTable, "%d ", (int)p->SumArea );
+    fprintf( pTable, "%d ", (int)SC_LibTimePs(p->pLib, p->MaxDelay) );
     fprintf( pTable, "%.2f ", 1.0*Time/CLOCKS_PER_SEC );
     fprintf( pTable, "\n" );
     fclose( pTable );
@@ -352,7 +359,7 @@ static inline void Abc_SclDumpStats( SC_Man * p, char * pFileName, clock_t Time
 extern Abc_Obj_t * Abc_SclFindCriticalCo( SC_Man * p, int * pfRise );
 extern Abc_Obj_t * Abc_SclFindMostCriticalFanin( SC_Man * p, int * pfRise, Abc_Obj_t * pNode );
 extern void        Abc_SclTimeNtkPrint( SC_Man * p, int fShowAll, int fShort );
-extern SC_Man *    Abc_SclManStart( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads );
+extern SC_Man *    Abc_SclManStart( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads, int fDept );
 extern void        Abc_SclTimeCone( SC_Man * p, Vec_Int_t * vCone );
 extern void        Abc_SclTimeNtkRecompute( SC_Man * p, float * pArea, float * pDelay, int fReverse );
 /*=== sclTime.c =============================================================*/
diff --git a/src/map/scl/sclSize.c b/src/map/scl/sclSize.c
index 45b0bcd2..f7bb9371 100644
--- a/src/map/scl/sclSize.c
+++ b/src/map/scl/sclSize.c
@@ -67,7 +67,8 @@ Vec_Int_t * Abc_SclCollectNodes( Abc_Ntk_t * p )
 ***********************************************************************/
 Vec_Int_t * Abc_SclFindCriticalCoRange( SC_Man * p, int Range )
 {
-    float fMaxArr = Abc_SclGetMaxDelay( p ) * (100.0 - Range) / 100.0;
+//    float fMaxArr = Abc_SclGetMaxDelay( p ) * (100.0 - Range) / 100.0;
+    float fMaxArr = Abc_SclReadMaxDelay( p ) * (100.0 - Range) / 100.0;
     Vec_Int_t * vPivots;
     Abc_Obj_t * pObj;
     int i;
@@ -333,7 +334,7 @@ void Abc_SclUpdateNetwork( SC_Man * p, Abc_Obj_t * pObj, int nCone, int fUpsize,
         printf( "%5d :",               iStep );
         printf( "%7d  ",               Abc_ObjId(pObj) );
         printf( "%-12s->  %-12s  ",    pOld->pName, pNew->pName );
-        printf( "d =%8.2f ps    ",     SC_LibTimePs(p->pLib, Abc_SclGetMaxDelay(p)) );
+        printf( "d =%8.2f ps    ",     SC_LibTimePs(p->pLib, Abc_SclReadMaxDelay(p)) );
         printf( "a =%10.2f   ",        p->SumArea );
         printf( "n =%5d   ",           nCone );
 //        Abc_PrintTime( 1, "Time",      clock() - p->timeTotal );
@@ -365,7 +366,7 @@ void Abc_SclSizingPerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, SC_SizePars * pPars
     Abc_Obj_t * pBest;
     clock_t nRuntimeLimit = pPars->nTimeOut ? pPars->nTimeOut * CLOCKS_PER_SEC + clock() : 0;
     int r, i, nNodes, nCones = 0, nDownSize = 0;
-    p = Abc_SclManStart( pLib, pNtk, pPars->fUseWireLoads );
+    p = Abc_SclManStart( pLib, pNtk, pPars->fUseWireLoads, 0 );
     p->timeTotal  = clock();
     if ( pPars->fPrintCP )
         Abc_SclTimeNtkPrint( p, 0, 0 );
@@ -375,7 +376,7 @@ void Abc_SclSizingPerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, SC_SizePars * pPars
     {
 //        printf( "%5d :                                       ", 0 );
         printf( "Starting parameters of current mapping:       " );
-        printf( "d =%8.2f ps    ", SC_LibTimePs(p->pLib, Abc_SclGetMaxDelay(p)) );
+        printf( "d =%8.2f ps    ", SC_LibTimePs(p->pLib, Abc_SclReadMaxDelay(p)) );
         printf( "a =%10.2f   ",    p->SumArea );
         printf( "           " );
         Abc_PrintTime( 1, "Time",      clock() - p->timeTotal );
@@ -458,7 +459,7 @@ void Abc_SclSizingPerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, SC_SizePars * pPars
             printf( "\n" );
     }
 
-    p->MaxDelay = Abc_SclGetMaxDelay(p);
+    p->MaxDelay = Abc_SclReadMaxDelay(p);
     if ( pPars->fPrintCP )
         Abc_SclTimeNtkPrint( p, 0, 0 );
     if ( nRuntimeLimit && clock() > nRuntimeLimit )
diff --git a/src/map/scl/sclTime.c b/src/map/scl/sclTime.c
index 7b27a9d0..ad0f7446 100644
--- a/src/map/scl/sclTime.c
+++ b/src/map/scl/sclTime.c
@@ -226,7 +226,7 @@ void Abc_SclDeptFanin( SC_Man * p, SC_Timing * pTime, Abc_Obj_t * pObj, Abc_Obj_
         pDepIn->rise  = Abc_MaxFloat( pDepIn->rise,  pDepOut->fall + Abc_SclLookup(pTime->pCellFall,  pSlewIn->rise, pLoad->fall) );
     }
 }
-void Abc_SclTimeNode( SC_Man * p, Abc_Obj_t * pObj, int fDept )
+void Abc_SclTimeNode( SC_Man * p, Abc_Obj_t * pObj, int fDept, float D )
 {
     SC_Timings * pRTime;
     SC_Timing * pTime;
@@ -256,6 +256,8 @@ void Abc_SclTimeNode( SC_Man * p, Abc_Obj_t * pObj, int fDept )
         else
             Abc_SclTimeFanin( p, pTime, pObj, Abc_ObjFanin(pObj, k) );
     }
+    if ( fDept )
+        p->pSlack[Abc_ObjId(pObj)] = Abc_MaxFloat( 0.0, Abc_SclObjSlack(p, pObj, D) );
 }
 void Abc_SclTimeCone( SC_Man * p, Vec_Int_t * vCone )
 {
@@ -269,7 +271,7 @@ void Abc_SclTimeCone( SC_Man * p, Vec_Int_t * vCone )
         printf( "  Updating node %d with gate %s\n", Abc_ObjId(pObj), Abc_SclObjCell(p, pObj)->pName );
         if ( fVerbose && Abc_ObjIsNode(pObj) )
         printf( "    before (%6.1f ps  %6.1f ps)   ", Abc_SclObjTimePs(p, pObj, 1), Abc_SclObjTimePs(p, pObj, 0) );
-        Abc_SclTimeNode( p, pObj, 0 );
+        Abc_SclTimeNode( p, pObj, 0, 0 );
         if ( fVerbose && Abc_ObjIsNode(pObj) )
         printf( "after (%6.1f ps  %6.1f ps)\n", Abc_SclObjTimePs(p, pObj, 1), Abc_SclObjTimePs(p, pObj, 0) );
     }
@@ -277,27 +279,26 @@ void Abc_SclTimeCone( SC_Man * p, Vec_Int_t * vCone )
 void Abc_SclTimeNtkRecompute( SC_Man * p, float * pArea, float * pDelay, int fReverse )
 {
     Abc_Obj_t * pObj;
+    float D;
     int i;
     Abc_SclComputeLoad( p );
     Abc_SclManCleanTime( p );
     Abc_NtkForEachNode1( p->pNtk, pObj, i )
-        Abc_SclTimeNode( p, pObj, 0 );
-    if ( fReverse )
-        Abc_NtkForEachNodeReverse1( p->pNtk, pObj, i )
-            Abc_SclTimeNode( p, pObj, 1 );
+        Abc_SclTimeNode( p, pObj, 0, 0 );
     Abc_NtkForEachCo( p->pNtk, pObj, i )
     {
         Abc_SclObjDupFanin( p, pObj );
         Vec_FltWriteEntry( p->vTimesOut, i, Abc_SclObjTimeMax(p, pObj) );
         Vec_QueUpdate( p->vQue, i );
     }
-//    Vec_FltClear( p->vTimesOut );
-//    Abc_NtkForEachCo( p->pNtk, pObj, i )
-//        Vec_FltPush( p->vTimesOut, Abc_SclObjTimeMax(p, pObj) );
+    D = Abc_SclReadMaxDelay( p );
     if ( pArea )
         *pArea = Abc_SclGetTotalArea( p );
     if ( pDelay )
-        *pDelay = Abc_SclGetMaxDelay( p );
+        *pDelay = D;
+    if ( fReverse )
+        Abc_NtkForEachNodeReverse1( p->pNtk, pObj, i )
+            Abc_SclTimeNode( p, pObj, 1, D );
 }
 
 /**Function*************************************************************
@@ -311,14 +312,14 @@ void Abc_SclTimeNtkRecompute( SC_Man * p, float * pArea, float * pDelay, int fRe
   SeeAlso     []
 
 ***********************************************************************/
-SC_Man * Abc_SclManStart( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads )
+SC_Man * Abc_SclManStart( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads, int fDept )
 {
     SC_Man * p = Abc_SclManAlloc( pLib, pNtk );
     assert( p->vGates == NULL );
     p->vGates = Abc_SclManFindGates( pLib, pNtk );
     if ( fUseWireLoads )
         p->pWLoadUsed = Abc_SclFindWireLoadModel( pLib, Abc_SclGetTotalArea(p) );
-    Abc_SclTimeNtkRecompute( p, &p->SumArea0, &p->MaxDelay0, 0 );
+    Abc_SclTimeNtkRecompute( p, &p->SumArea0, &p->MaxDelay0, fDept );
     p->SumArea = p->SumArea0;
     return p;
 }
@@ -337,7 +338,7 @@ SC_Man * Abc_SclManStart( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads )
 void Abc_SclTimePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads, int fShowAll, int fShort, int fDumpStats )
 {
     SC_Man * p;
-    p = Abc_SclManStart( pLib, pNtk, fUseWireLoads );   
+    p = Abc_SclManStart( pLib, pNtk, fUseWireLoads, 1 );   
     Abc_SclTimeNtkPrint( p, fShowAll, fShort );
     if ( fDumpStats )
         Abc_SclDumpStats( p, "stats.txt", 0 );
diff --git a/src/map/scl/sclUpsize.c b/src/map/scl/sclUpsize.c
index 90c7708f..6c9a61bc 100644
--- a/src/map/scl/sclUpsize.c
+++ b/src/map/scl/sclUpsize.c
@@ -28,8 +28,6 @@ ABC_NAMESPACE_IMPL_START
 ///                        DECLARATIONS                              ///
 ////////////////////////////////////////////////////////////////////////
 
-extern Vec_Int_t * Abc_SclFindCriticalCoWindow( SC_Man * p, int Window );
-
 ////////////////////////////////////////////////////////////////////////
 ///                     FUNCTION DEFINITIONS                         ///
 ////////////////////////////////////////////////////////////////////////
@@ -100,7 +98,7 @@ Vec_Int_t * Abc_SclFindTFO( Abc_Ntk_t * p, Vec_Int_t * vPath )
 ***********************************************************************/
 Vec_Int_t * Abc_SclFindCriticalCoWindow( SC_Man * p, int Window )
 {
-    float fMaxArr = Abc_SclGetMaxDelay( p ) * (100.0 - Window) / 100.0;
+    float fMaxArr = Abc_SclReadMaxDelay( p ) * (100.0 - Window) / 100.0;
     Vec_Int_t * vPivots;
     Abc_Obj_t * pObj;
     int i;
@@ -123,7 +121,7 @@ Vec_Int_t * Abc_SclFindCriticalCoWindow( SC_Man * p, int Window )
   SeeAlso     []
 
 ***********************************************************************/
-void Abc_SclFindCriticalNodeWindow_rec( SC_Man * p, Abc_Obj_t * pObj, Vec_Int_t * vPath, float fSlack )
+void Abc_SclFindCriticalNodeWindow_rec( SC_Man * p, Abc_Obj_t * pObj, Vec_Int_t * vPath, float fSlack, int fDept )
 {
     Abc_Obj_t * pNext;
     float fArrMax, fSlackFan;
@@ -135,30 +133,40 @@ void Abc_SclFindCriticalNodeWindow_rec( SC_Man * p, Abc_Obj_t * pObj, Vec_Int_t
     Abc_NodeSetTravIdCurrent( pObj );
     assert( Abc_ObjIsNode(pObj) );
     // compute the max arrival time of the fanins
-    fArrMax = Abc_SclGetMaxDelayNodeFanins( p, pObj );
+    if ( fDept )
+        fArrMax = p->pSlack[Abc_ObjId(pObj)];
+    else
+        fArrMax = Abc_SclGetMaxDelayNodeFanins( p, pObj );
+    assert( fArrMax >= 0 );
     // traverse all fanins whose arrival times are within a window
     Abc_ObjForEachFanin( pObj, pNext, i )
     {
-        fSlackFan = fSlack - (fArrMax - Abc_SclObjTimeMax(p, pNext));
+        if ( Abc_ObjIsCi(pNext) || Abc_ObjFaninNum(pNext) == 0 )
+            continue;
+        assert( Abc_ObjIsNode(pNext) );
+        if ( fDept )
+            fSlackFan = fSlack - (p->pSlack[Abc_ObjId(pNext)] - fArrMax);
+        else
+            fSlackFan = fSlack - (fArrMax - Abc_SclObjTimeMax(p, pNext));
         if ( fSlackFan >= 0 )
-            Abc_SclFindCriticalNodeWindow_rec( p, pNext, vPath, fSlackFan );
+            Abc_SclFindCriticalNodeWindow_rec( p, pNext, vPath, fSlackFan, fDept );
     }
     if ( Abc_ObjFaninNum(pObj) > 0 )
         Vec_IntPush( vPath, Abc_ObjId(pObj) );
 }
-Vec_Int_t * Abc_SclFindCriticalNodeWindow( SC_Man * p, Vec_Int_t * vPathCos, int Window )
+Vec_Int_t * Abc_SclFindCriticalNodeWindow( SC_Man * p, Vec_Int_t * vPathCos, int Window, int fDept )
 {
-    float fMaxArr = Abc_SclGetMaxDelay( p );
-    float fSlack = fMaxArr * Window / 100.0;
+    float fMaxArr = Abc_SclReadMaxDelay( p );
+    float fSlackMax = fMaxArr * Window / 100.0;
     Vec_Int_t * vPath = Vec_IntAlloc( 100 );
     Abc_Obj_t * pObj;
     int i;
     Abc_NtkIncrementTravId( p->pNtk ); 
     Abc_NtkForEachObjVec( vPathCos, p->pNtk, pObj, i )
     {
-        float fSlackThis = fSlack - (fMaxArr - Abc_SclObjTimeMax(p, pObj));
+        float fSlackThis = fSlackMax - (fMaxArr - Abc_SclObjTimeMax(p, pObj));
         if ( fSlackThis >= 0 )
-            Abc_SclFindCriticalNodeWindow_rec( p, Abc_ObjFanin0(pObj), vPath, fSlackThis );
+            Abc_SclFindCriticalNodeWindow_rec( p, Abc_ObjFanin0(pObj), vPath, fSlackThis, fDept );
     }
     // label critical nodes
     Abc_NtkForEachObjVec( vPathCos, p->pNtk, pObj, i )
@@ -454,29 +462,30 @@ void Abc_SclUpsizePrint( SC_Man * p, int Iter, int win, int nPathPos, int nPathN
   SeeAlso     []
 
 ***********************************************************************/
-void Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int nIters, int nIterNoChange, int Window, int Ratio, int Notches, int TimeOut, int fDumpStats, int fVerbose, int fVeryVerbose )
+void Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, SC_UpSizePars * pPars )
 {
     SC_Man * p;
     Vec_Int_t * vPathPos = NULL;    // critical POs
     Vec_Int_t * vPathNodes = NULL;  // critical nodes and PIs
     Vec_Int_t * vTFO;
+    clock_t clk, nRuntimeLimit = pPars->TimeOut ? pPars->TimeOut * CLOCKS_PER_SEC + clock() : 0;
     int i, win, nUpsizes = -1, nFramesNoChange = 0;
     int nAllPos, nAllNodes, nAllTfos, nAllUpsizes;
-    clock_t clk;
 
-    if ( fVerbose )
+    if ( pPars->fVerbose )
     {
         printf( "Sizing parameters: " );
-        printf( "Iters =%4d.  ",            nIters );
-        printf( "Time window =%3d %%.  ",   Window );
-        printf( "Update ratio =%3d %%.  ",  Ratio );
-        printf( "Max upsize steps =%2d.  ", Notches );
-        printf( "Timeout =%3d sec",         TimeOut );
+        printf( "Iters =%5d.  ",          pPars->nIters   );
+        printf( "Time window =%3d %%. ",  pPars->Window   );
+        printf( "Update ratio =%3d %%. ", pPars->Ratio    );
+        printf( "Max steps =%3d. ",       pPars->Notches  );
+        printf( "UseDept =%2d. ",         pPars->fUseDept );
+        printf( "Timeout =%4d sec",       pPars->TimeOut  );
         printf( "\n" );
     }
 
     // prepare the manager; collect init stats
-    p = Abc_SclManStart( pLib, pNtk, 1 );
+    p = Abc_SclManStart( pLib, pNtk, 1, pPars->fUseDept );
     p->timeTotal  = clock();
     assert( p->vGatesBest == NULL );
     p->vGatesBest = Vec_IntDup( p->vGates );
@@ -484,19 +493,19 @@ void Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int nIters, int nIte
 
     // perform upsizing
     nAllPos = nAllNodes = nAllTfos = nAllUpsizes = 0;
-    for ( i = 0; i < nIters; i++ )
+    for ( i = 0; i < pPars->nIters; i++ )
     {
-        for ( win = Window; win <= 100;  win *= 2 )
+        for ( win = pPars->Window; win <= 100;  win *= 2 )
         {
             // detect critical path
             clk = clock();
             vPathPos   = Abc_SclFindCriticalCoWindow( p, win );
-            vPathNodes = Abc_SclFindCriticalNodeWindow( p, vPathPos, win );
+            vPathNodes = Abc_SclFindCriticalNodeWindow( p, vPathPos, win, pPars->fUseDept );
             p->timeCone += clock() - clk;
 
             // selectively upsize the nodes
             clk = clock();
-            nUpsizes   = Abc_SclFindUpsizes( p, vPathNodes, Ratio, Notches, i );
+            nUpsizes   = Abc_SclFindUpsizes( p, vPathNodes, pPars->Ratio, pPars->Notches, i );
             p->timeSize += clock() - clk;
 
             // unmark critical path
@@ -514,15 +523,21 @@ void Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int nIters, int nIte
 
         // update timing information
         clk = clock();
-//        vTFO = Abc_SclFindTFO( p->pNtk, vPathNodes );
-//        Abc_SclTimeCone( p, vTFO );
-        vTFO = Vec_IntAlloc( 0 );
-        Abc_SclTimeNtkRecompute( p, NULL, NULL, 0 );
+        if ( pPars->fUseDept )
+        {
+            vTFO = Vec_IntAlloc( 0 );
+            Abc_SclTimeNtkRecompute( p, NULL, NULL, pPars->fUseDept );
+        }
+        else
+        {
+            vTFO = Abc_SclFindTFO( p->pNtk, vPathNodes );
+            Abc_SclTimeCone( p, vTFO );
+        }
         p->timeTime += clock() - clk;
 //        Abc_SclUpsizePrintDiffs( p, pLib, pNtk );
 
         // save the best network
-        p->MaxDelay = Abc_SclGetMaxDelay( p );
+        p->MaxDelay = Abc_SclReadMaxDelay( p );
         if ( p->BestDelay > p->MaxDelay )
         {
             p->BestDelay = p->MaxDelay;
@@ -531,27 +546,35 @@ void Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int nIters, int nIte
         }
         else
             nFramesNoChange++;
-        if ( nFramesNoChange > nIterNoChange )
+        if ( nFramesNoChange > pPars->nIterNoChange )
+        {
+            Vec_IntFree( vPathPos );
+            Vec_IntFree( vPathNodes );
+            Vec_IntFree( vTFO );
             break;
+        }
 
         // report and cleanup
-        Abc_SclUpsizePrint( p, i, win, Vec_IntSize(vPathPos), Vec_IntSize(vPathNodes), nUpsizes, Vec_IntSize(vTFO), fVeryVerbose ); //|| (i == nIters-1) );
-        nAllPos += Vec_IntSize(vPathPos);
-        nAllNodes += Vec_IntSize(vPathNodes);
-        nAllTfos += Vec_IntSize(vTFO);
+        Abc_SclUpsizePrint( p, i, win, Vec_IntSize(vPathPos), Vec_IntSize(vPathNodes), nUpsizes, Vec_IntSize(vTFO), pPars->fVeryVerbose ); //|| (i == nIters-1) );
+        nAllPos     += Vec_IntSize(vPathPos);
+        nAllNodes   += Vec_IntSize(vPathNodes);
+        nAllTfos    += Vec_IntSize(vTFO);
         nAllUpsizes += nUpsizes;
         Vec_IntFree( vPathPos );
         Vec_IntFree( vPathNodes );
         Vec_IntFree( vTFO );
+        // check timeout
+        if ( nRuntimeLimit && clock() > nRuntimeLimit )
+            break;
     }
     // update for best gates and recompute timing
     ABC_SWAP( Vec_Int_t *, p->vGatesBest, p->vGates );
     Abc_SclTimeNtkRecompute( p, &p->SumArea, &p->MaxDelay, 0 );
-    if ( fVerbose )
-        Abc_SclUpsizePrint( p, i, Window, nAllPos/i, nAllNodes/i, nAllUpsizes/i, nAllTfos/i, 1 );
+    if ( pPars->fVerbose )
+        Abc_SclUpsizePrint( p, i, pPars->Window, nAllPos/(i?i:1), nAllNodes/(i?i:1), nAllUpsizes/(i?i:1), nAllTfos/(i?i:1), 1 );
     // report runtime
     p->timeTotal = clock() - p->timeTotal;
-    if ( fVerbose )
+    if ( pPars->fVerbose )
     {
         p->timeOther = p->timeTotal - p->timeCone - p->timeSize - p->timeTime;
         ABC_PRTP( "Runtime: Critical path", p->timeCone,  p->timeTotal );
@@ -560,8 +583,10 @@ void Abc_SclUpsizePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int nIters, int nIte
         ABC_PRTP( "Runtime: Other        ", p->timeOther, p->timeTotal );
         ABC_PRTP( "Runtime: TOTAL        ", p->timeTotal, p->timeTotal );
     }
-    if ( fDumpStats )
+    if ( pPars->fDumpStats )
         Abc_SclDumpStats( p, "stats2.txt", p->timeTotal );
+    if ( nRuntimeLimit && clock() > nRuntimeLimit )
+        printf( "Gate sizing timed out at %d seconds.\n", pPars->TimeOut );
 
     // save the result and quit
     Abc_SclManSetGates( pLib, pNtk, p->vGates ); // updates gate pointers