Adding restart to rarity simulation in sim3 and &sim3.

4 files changed, 99 insertions, 37 deletions

diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index b3f4d559..5f93db11 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -16630,21 +16630,23 @@ int Abc_CommandSim3( Abc_Frame_t * pAbc, int argc, char ** argv )
     int nWords;
     int nBinSize;
     int nRounds;
+    int nRestart;
     int nRandSeed;
     int TimeOut;
     int fVerbose;
-    extern int Abc_NtkDarSeqSim3( Abc_Ntk_t * pNtk, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fVerbose );
+    extern int Abc_NtkDarSeqSim3( Abc_Ntk_t * pNtk, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fVerbose );
     // set defaults
     nFrames    =  20;
     nWords     =  50;
     nBinSize   =   8;
-    nRounds    =  80;
+    nRounds    =   0;
+    nRestart   = 100;
     nRandSeed  =   0;
     TimeOut    =   0;
     fVerbose   =   0;
     // parse command line
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "FWBRNTvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "FWBRSNTvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -16692,6 +16694,17 @@ int Abc_CommandSim3( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( nRounds < 0 ) 
                 goto usage;
             break;
+        case 'S':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-S\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nRestart = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nRestart < 0 ) 
+                goto usage;
+            break;
         case 'N':
             if ( globalUtilOptind >= argc )
             {
@@ -16734,18 +16747,19 @@ int Abc_CommandSim3( Abc_Frame_t * pAbc, int argc, char ** argv )
         return 1;
     }
     ABC_FREE( pNtk->pSeqModel );
-    pAbc->Status = Abc_NtkDarSeqSim3( pNtk, nFrames, nWords, nBinSize, nRounds, nRandSeed, TimeOut, fVerbose );  
+    pAbc->Status = Abc_NtkDarSeqSim3( pNtk, nFrames, nWords, nBinSize, nRounds, nRestart, nRandSeed, TimeOut, fVerbose );  
 //    pAbc->nFrames = pAbc->pCex->iFrame;
     Abc_FrameReplaceCex( pAbc, &pNtk->pSeqModel );
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: sim3 [-FWBRNT num] [-vh]\n" );
+    Abc_Print( -2, "usage: sim3 [-FWBRSNT num] [-vh]\n" );
     Abc_Print( -2, "\t         performs random simulation of the sequential miter\n" );
     Abc_Print( -2, "\t-F num : the number of frames to simulate [default = %d]\n", nFrames );
     Abc_Print( -2, "\t-W num : the number of words to simulate [default = %d]\n",  nWords );
     Abc_Print( -2, "\t-B num : the number of flops in one bin [default = %d]\n",   nBinSize );
     Abc_Print( -2, "\t-R num : the number of simulation rounds [default = %d]\n",  nRounds );
+    Abc_Print( -2, "\t-S num : the number of rounds before a restart [default = %d]\n",  nRestart );
     Abc_Print( -2, "\t-N num : random number seed (1 <= num <= 1000) [default = %d]\n", nRandSeed );
     Abc_Print( -2, "\t-T num : approximate runtime limit in seconds [default = %d]\n", TimeOut );
     Abc_Print( -2, "\t-v     : toggle printing verbose information [default = %s]\n", fVerbose? "yes": "no" );
@@ -23257,21 +23271,23 @@ int Abc_CommandAbc9Sim3( Abc_Frame_t * pAbc, int argc, char ** argv )
     int nWords;
     int nBinSize;
     int nRounds;
+    int nRestart;
     int nRandSeed;
     int TimeOut;
     int fVerbose;
-    extern int Ssw_RarSimulateGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fVerbose );
+    extern int Ssw_RarSimulateGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fVerbose );
     // set defaults
     nFrames    =  20;
     nWords     =  50;
     nBinSize   =   8;
-    nRounds    =  80;
+    nRounds    =   0;
+    nRestart   = 100;
     nRandSeed  =   0;
     TimeOut    =   0;
     fVerbose   =   0;
     // parse command line
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "FWBRNTvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "FWBRSNTvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -23319,6 +23335,17 @@ int Abc_CommandAbc9Sim3( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( nRounds < 0 ) 
                 goto usage;
             break;
+        case 'S':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-S\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nRestart = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nRestart < 0 ) 
+                goto usage;
+            break;
         case 'N':
             if ( globalUtilOptind >= argc )
             {
@@ -23355,7 +23382,7 @@ int Abc_CommandAbc9Sim3( Abc_Frame_t * pAbc, int argc, char ** argv )
         Abc_Print( -1, "Abc_CommandAbc9Sim3(): There is no AIG.\n" );
         return 1;
     }
-    pAbc->Status = Ssw_RarSimulateGia( pAbc->pGia, nFrames, nWords, nBinSize, nRounds, nRandSeed, TimeOut, fVerbose );  
+    pAbc->Status = Ssw_RarSimulateGia( pAbc->pGia, nFrames, nWords, nBinSize, nRounds, nRestart, nRandSeed, TimeOut, fVerbose );  
 //    pAbc->nFrames = pAbc->pGia->pCexSeq->iFrame;
     Abc_FrameReplaceCex( pAbc, &pAbc->pGia->pCexSeq );
     return 0;
@@ -23367,6 +23394,7 @@ usage:
     Abc_Print( -2, "\t-W num : the number of words to simulate [default = %d]\n",  nWords );
     Abc_Print( -2, "\t-B num : the number of flops in one bin [default = %d]\n",   nBinSize );
     Abc_Print( -2, "\t-R num : the number of simulation rounds [default = %d]\n",  nRounds );
+    Abc_Print( -2, "\t-S num : the number of rounds before a restart [default = %d]\n",  nRestart );
     Abc_Print( -2, "\t-N num : random number seed (1 <= num <= 1000) [default = %d]\n", nRandSeed );
     Abc_Print( -2, "\t-T num : approximate runtime limit in seconds [default = %d]\n", TimeOut );
     Abc_Print( -2, "\t-v     : toggle printing verbose information [default = %s]\n", fVerbose? "yes": "no" );
@@ -23799,12 +23827,13 @@ usage:
 int Abc_CommandAbc9Equiv3( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
 //    extern int Ssw_RarSignalFilterGia2( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int TimeOut, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose );
-    extern int Ssw_RarSignalFilterGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose );
+    extern int Ssw_RarSignalFilterGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose );
     int c;
     int nFrames    =   20;
     int nWords     =   50;
     int nBinSize   =    8;
-    int nRounds    =   80;
+    int nRounds    =    0;
+    int nRestart   =  100;
     int nRandSeed  =    0;
     int TimeOut    =    0;
     int fMiter     =    0;
@@ -23813,7 +23842,7 @@ int Abc_CommandAbc9Equiv3( Abc_Frame_t * pAbc, int argc, char ** argv )
     int fNewAlgo   =    1;
     int fVerbose   =    0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "FWBRNTmxlavh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "FWBRSNTmxlavh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -23861,6 +23890,17 @@ int Abc_CommandAbc9Equiv3( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( nRounds < 0 ) 
                 goto usage;
             break;
+        case 'S':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-S\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nRestart = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nRestart < 0 ) 
+                goto usage;
+            break;
         case 'N':
             if ( globalUtilOptind >= argc )
             {
@@ -23934,7 +23974,7 @@ int Abc_CommandAbc9Equiv3( Abc_Frame_t * pAbc, int argc, char ** argv )
         }
     }
 //    if ( fNewAlgo )
-        pAbc->Status = Ssw_RarSignalFilterGia( pAbc->pGia, nFrames, nWords, nBinSize, nRounds, nRandSeed, TimeOut, fMiter, fUseCex? pAbc->pCex: NULL, fLatchOnly, fVerbose );
+        pAbc->Status = Ssw_RarSignalFilterGia( pAbc->pGia, nFrames, nWords, nBinSize, nRounds, nRestart, nRandSeed, TimeOut, fMiter, fUseCex? pAbc->pCex: NULL, fLatchOnly, fVerbose );
 //    else
 //        pAbc->Status = Ssw_RarSignalFilterGia2( pAbc->pGia, nFrames, nWords, nBinSize, nRounds, TimeOut, fUseCex? pAbc->pCex: NULL, fLatchOnly, fVerbose );
 //    pAbc->nFrames = pAbc->pGia->pCexSeq->iFrame;
@@ -23942,12 +23982,13 @@ int Abc_CommandAbc9Equiv3( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: &equiv3 [-FWRNT num] [-mxlvh]\n" );
+    Abc_Print( -2, "usage: &equiv3 [-FWRSNT num] [-mxlvh]\n" );
     Abc_Print( -2, "\t         computes candidate equivalence classes\n" );
     Abc_Print( -2, "\t-F num : the max number of frames for BMC [default = %d]\n",    nFrames );
     Abc_Print( -2, "\t-W num : the number of words to simulate [default = %d]\n",     nWords );
 //    Abc_Print( -2, "\t-B num : the number of flops in one bin [default = %d]\n",      nBinSize );
     Abc_Print( -2, "\t-R num : the max number of simulation rounds [default = %d]\n", nRounds );
+    Abc_Print( -2, "\t-S num : the number of rounds before a restart [default = %d]\n",  nRestart );
     Abc_Print( -2, "\t-N num : random number seed (1 <= num <= 1000) [default = %d]\n", nRandSeed );
     Abc_Print( -2, "\t-T num : runtime limit in seconds for all rounds [default = %d]\n", TimeOut );
     Abc_Print( -2, "\t-m     : toggle miter vs. any circuit [default = %s]\n",        fMiter? "miter": "circuit" );
diff --git a/src/base/abci/abcDar.c b/src/base/abci/abcDar.c
index bd299425..4fd80eef 100644
--- a/src/base/abci/abcDar.c
+++ b/src/base/abci/abcDar.c
@@ -3199,7 +3199,7 @@ int Abc_NtkDarSeqSim( Abc_Ntk_t * pNtk, int nFrames, int nWords, int TimeOut, in
   SeeAlso     []
 
 ***********************************************************************/
-int Abc_NtkDarSeqSim3( Abc_Ntk_t * pNtk, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fVerbose )
+int Abc_NtkDarSeqSim3( Abc_Ntk_t * pNtk, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fVerbose )
 {
     Aig_Man_t * pMan;
     int status, RetValue = -1;
@@ -3210,12 +3210,12 @@ int Abc_NtkDarSeqSim3( Abc_Ntk_t * pNtk, int nFrames, int nWords, int nBinSize,
         Abc_AigCleanup((Abc_Aig_t *)pNtk->pManFunc);
     }
     pMan = Abc_NtkToDar( pNtk, 0, 1 );
-    if ( Ssw_RarSimulate( pMan, nFrames, nWords, nBinSize, nRounds, nRandSeed, TimeOut, fVerbose ) == 0 )
+    if ( Ssw_RarSimulate( pMan, nFrames, nWords, nBinSize, nRounds, nRestart, nRandSeed, TimeOut, fVerbose ) == 0 )
     { 
         if ( pMan->pSeqModel )
         {
-            Abc_Print( 1, "Simulation of %d frames with %d words asserted output %d in frame %d. ", 
-                nFrames, nWords, pMan->pSeqModel->iPo, pMan->pSeqModel->iFrame );
+//            Abc_Print( 1, "Simulation of %d frames with %d words asserted output %d in frame %d. ", 
+//                nFrames, nWords, pMan->pSeqModel->iPo, pMan->pSeqModel->iFrame );
             status = Saig_ManVerifyCex( pMan, pMan->pSeqModel );
             if ( status == 0 )
                 Abc_Print( 1, "Abc_NtkDarSeqSim(): Counter-example verification has FAILED.\n" );
@@ -3230,7 +3230,7 @@ int Abc_NtkDarSeqSim3( Abc_Ntk_t * pNtk, int nFrames, int nWords, int nBinSize,
 //        Abc_Print( 1, "Simulation of %d frames with %d words did not assert the outputs.    ", 
 //            nFrames, nWords );
     }
-    ABC_PRT( "Time", clock() - clk );
+//    ABC_PRT( "Time", clock() - clk );
     Aig_ManStop( pMan );
     return RetValue;
 }
diff --git a/src/proof/ssw/ssw.h b/src/proof/ssw/ssw.h
index 4680f6fb..35d41a35 100644
--- a/src/proof/ssw/ssw.h
+++ b/src/proof/ssw/ssw.h
@@ -116,8 +116,8 @@ extern int           Ssw_SecWithPairs( Aig_Man_t * pAig1, Aig_Man_t * pAig2, Vec
 extern int           Ssw_SecGeneral( Aig_Man_t * pAig1, Aig_Man_t * pAig2, Ssw_Pars_t * pPars );
 extern int           Ssw_SecGeneralMiter( Aig_Man_t * pMiter, Ssw_Pars_t * pPars );
 /*=== sswRarity.c ===================================================*/
-extern int           Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose );
-extern int           Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fVerbose );
+extern int           Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose );
+extern int           Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fVerbose );
 /*=== sswSim.c ===================================================*/
 extern Ssw_Sml_t *   Ssw_SmlSimulateComb( Aig_Man_t * pAig, int nWords );
 extern Ssw_Sml_t *   Ssw_SmlSimulateSeq( Aig_Man_t * pAig, int nPref, int nFrames, int nWords );
diff --git a/src/proof/ssw/sswRarity.c b/src/proof/ssw/sswRarity.c
index 01715e7d..b845ec11 100644
--- a/src/proof/ssw/sswRarity.c
+++ b/src/proof/ssw/sswRarity.c
@@ -17,7 +17,7 @@
   Revision    [$Id: sswRarity.c,v 1.00 2008/09/01 00:00:00 alanmi Exp $]
 
 ***********************************************************************/
-
+ 
 #include "sswInt.h"
 #include "aig/gia/giaAig.h"
 #include "base/main/main.h"
@@ -191,8 +191,6 @@ Abc_Cex_t * Ssw_RarDeriveCex( Ssw_RarMan_t * p, int iFrame, int iPo, int iPatFin
     else
     {
 //      printf( "Counter-example verification is successful.\n" );
-        if ( fVerbose )
-            printf( "Output %d was asserted in frame %d (use \"write_counter\" to dump a witness). \n", pCex->iPo, pCex->iFrame );
     }
     return pCex;
 }
@@ -892,7 +890,7 @@ int Ssw_RarCheckTrivial( Aig_Man_t * pAig, int fVerbose )
   SeeAlso     []
 
 ***********************************************************************/
-int Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fVerbose )
+int Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fVerbose )
 {
     int fTryBmc = 0;
     int fMiter = 1;
@@ -900,6 +898,8 @@ int Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, in
     int r, f = -1;
     clock_t clk, clkTotal = clock();
     clock_t nTimeToStop = TimeOut ? TimeOut * CLOCKS_PER_SEC + clock(): 0;
+    int nNumRestart = 0;
+    int nSavedSeed = nRandSeed;
     int RetValue = -1;
     int iFrameFail = -1;
     assert( Aig_ManRegNum(pAig) > 0 );
@@ -914,14 +914,14 @@ int Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, in
         printf( "Rarity simulation with %d words, %d frames, %d rounds, %d seed, and %d sec timeout.\n", 
             nWords, nFrames, nRounds, nRandSeed, TimeOut );
     // reset random numbers
-    Ssw_RarManPrepareRandom( nRandSeed );
+    Ssw_RarManPrepareRandom( nSavedSeed );
 
     // create manager
     p = Ssw_RarManStart( pAig, nWords, nFrames, nBinSize, fVerbose );
     p->vInits = Vec_IntStart( Aig_ManRegNum(pAig) * nWords );
 
     // perform simulation rounds
-    for ( r = 0; r < nRounds; r++ )
+    for ( r = 0; !nRounds || (nNumRestart * nRestart + r < nRounds); r++ )
     {
         clk = clock();
         if ( fTryBmc )
@@ -940,9 +940,14 @@ int Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, in
             {
                 if ( fVerbose ) printf( "\n" );
 //                printf( "Simulation asserted a PO in frame f: %d <= f < %d.\n", r * nFrames, (r+1) * nFrames );
-                Ssw_RarManPrepareRandom( nRandSeed );
+                Ssw_RarManPrepareRandom( nSavedSeed );
                 ABC_FREE( pAig->pSeqModel );
+                if ( fVerbose )
+                    printf( "Simulated %d frames for %d rounds with %d restarts.\n", nFrames, nNumRestart * nRestart + r, nNumRestart );
                 pAig->pSeqModel = Ssw_RarDeriveCex( p, r * p->nFrames + f, p->iFailPo, p->iFailPat, fVerbose );
+                // print final report
+                printf( "Output %d was asserted in frame %d (use \"write_counter\" to dump a witness).  ", pAig->pSeqModel->iPo, pAig->pSeqModel->iFrame );
+                Abc_PrintTime( 1, "Time", clock() - clkTotal );
                 RetValue = 0;
                 goto finish;
             }
@@ -950,12 +955,25 @@ int Ssw_RarSimulate( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, in
             if ( TimeOut && clock() > nTimeToStop )
             {
                 if ( fVerbose ) printf( "\n" );
-                printf( "Reached timeout (%d seconds).\n",  TimeOut );
+                printf( "Simulated %d frames for %d rounds with %d restarts.  ", nFrames, nNumRestart * nRestart + r, nNumRestart );
+                printf( "Reached timeout (%d sec).\n",  TimeOut );
                 goto finish;
             }
         }
         // get initialization patterns
-        Ssw_RarTransferPatterns( p, p->vInits );
+        if ( r == nRestart )
+        {
+            r = -1;
+            nSavedSeed = (nSavedSeed + 1) % 1000;
+            Ssw_RarManPrepareRandom( nSavedSeed );
+            Vec_IntFill( p->vInits, Aig_ManRegNum(pAig) * nWords, 0 );
+            nNumRestart++;
+            Vec_IntClear( p->vPatBests );
+            // clean rarity info
+//            memset( p->pRarity, 0, sizeof(int) * (1 << nBinSize) * p->nGroups );
+        }
+        else
+            Ssw_RarTransferPatterns( p, p->vInits );
         // printout
         if ( fVerbose )
         {
@@ -988,12 +1006,12 @@ finish:
   SeeAlso     []
 
 ***********************************************************************/
-int Ssw_RarSimulateGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fVerbose )
+int Ssw_RarSimulateGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fVerbose )
 {
     Aig_Man_t * pAig;
     int RetValue;
     pAig = Gia_ManToAigSimple( p );
-    RetValue = Ssw_RarSimulate( pAig, nFrames, nWords, nBinSize, nRounds, nRandSeed, TimeOut, fVerbose );
+    RetValue = Ssw_RarSimulate( pAig, nFrames, nWords, nBinSize, nRounds, nRestart, nRandSeed, TimeOut, fVerbose );
     // save counter-example
     Abc_CexFree( p->pCexSeq );
     p->pCexSeq = pAig->pSeqModel; pAig->pSeqModel = NULL;
@@ -1012,7 +1030,7 @@ int Ssw_RarSimulateGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, in
   SeeAlso     []
 
 ***********************************************************************/
-int Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose )
+int Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose )
 {
     Ssw_RarMan_t * p;
     int r, f = -1, i, k;
@@ -1063,7 +1081,7 @@ int Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize
         Ssw_ClassesPrint( p->ppClasses, 0 );
     }
     // refine classes using BMC
-    for ( r = 0; r < nRounds; r++ )
+    for ( r = 0; !nRounds || r < nRounds; r++ )
     {
         // start filtering equivalence classes
         if ( Ssw_ClassesCand1Num(p->ppClasses) == 0 && Ssw_ClassesClassNum(p->ppClasses) == 0 )
@@ -1083,6 +1101,9 @@ int Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize
                 Ssw_RarManPrepareRandom( nRandSeed );
                 Abc_CexFree( pAig->pSeqModel );
                 pAig->pSeqModel = Ssw_RarDeriveCex( p, r * p->nFrames + f, p->iFailPo, p->iFailPat, 1 );
+                // print final report
+                printf( "Output %d was asserted in frame %d (use \"write_counter\" to dump a witness).  ", pAig->pSeqModel->iPo, pAig->pSeqModel->iFrame );
+                Abc_PrintTime( 1, "Time", clock() - clkTotal );
                 RetValue = 0;
                 goto finish;
             }
@@ -1090,7 +1111,7 @@ int Ssw_RarSignalFilter( Aig_Man_t * pAig, int nFrames, int nWords, int nBinSize
             if ( TimeOut && clock() > nTimeToStop )
             {
                 if ( fVerbose ) printf( "\n" );
-                printf( "Reached timeout (%d seconds).\n",  TimeOut );
+                printf( "Reached timeout (%d sec).\n",  TimeOut );
                 goto finish;
             }
         }
@@ -1132,7 +1153,7 @@ finish:
   SeeAlso     []
 
 ***********************************************************************/
-int Ssw_RarSignalFilterGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose )
+int Ssw_RarSignalFilterGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize, int nRounds, int nRestart, int nRandSeed, int TimeOut, int fMiter, Abc_Cex_t * pCex, int fLatchOnly, int fVerbose )
 { 
     Aig_Man_t * pAig;
     int RetValue;
@@ -1143,7 +1164,7 @@ int Ssw_RarSignalFilterGia( Gia_Man_t * p, int nFrames, int nWords, int nBinSize
         ABC_FREE( p->pReprs );
         ABC_FREE( p->pNexts );
     }
-    RetValue = Ssw_RarSignalFilter( pAig, nFrames, nWords, nBinSize, nRounds, nRandSeed, TimeOut, fMiter, pCex, fLatchOnly, fVerbose );
+    RetValue = Ssw_RarSignalFilter( pAig, nFrames, nWords, nBinSize, nRounds, nRestart, nRandSeed, TimeOut, fMiter, pCex, fLatchOnly, fVerbose );
     Gia_ManReprFromAigRepr( pAig, p );
     // save counter-example
     Abc_CexFree( p->pCexSeq );