Version abc71002

5 files changed, 331 insertions, 92 deletions

diff --git a/src/base/abc/abc.h b/src/base/abc/abc.h
index f7739b91..11161698 100644
--- a/src/base/abc/abc.h
+++ b/src/base/abc/abc.h
@@ -197,6 +197,7 @@ struct Abc_Ntk_t_
     Vec_Int_t *       vLevelsR;      // level in the reverse topological order (for AIGs)
     Vec_Ptr_t *       vSupps;        // CO support information
     int *             pModel;        // counter-example (for miters)
+    void *            pSeqModel;     // counter-example (for sequential miters)
     Abc_Ntk_t *       pExdc;         // the EXDC network (if given)
     void *            pData;         // misc
     Abc_Ntk_t *       pCopy;
diff --git a/src/base/abc/abcNtk.c b/src/base/abc/abcNtk.c
index adaaf7be..d78a3a6a 100644
--- a/src/base/abc/abcNtk.c
+++ b/src/base/abc/abcNtk.c
@@ -979,7 +979,8 @@ void Abc_NtkDelete( Abc_Ntk_t * pNtk )
     Vec_PtrFree( pNtk->vObjs );
     Vec_PtrFree( pNtk->vBoxes );
     if ( pNtk->vLevelsR ) Vec_IntFree( pNtk->vLevelsR );
-    if ( pNtk->pModel ) free( pNtk->pModel );
+    FREE( pNtk->pModel );
+    FREE( pNtk->pSeqModel );
     TotalMemory  = 0;
     TotalMemory += pNtk->pMmObj? Extra_MmFixedReadMemUsage(pNtk->pMmObj)  : 0;
     TotalMemory += pNtk->pMmStep? Extra_MmStepReadMemUsage(pNtk->pMmStep) : 0;
diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 7d9b8be2..3f9ffb40 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -123,11 +123,9 @@ static int Abc_CommandISat           ( Abc_Frame_t * pAbc, int argc, char ** arg
 static int Abc_CommandIFraig         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandDFraig         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandCSweep         ( Abc_Frame_t * pAbc, int argc, char ** argv );
-static int Abc_CommandIProve         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandDProve         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandHaig           ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandMini           ( Abc_Frame_t * pAbc, int argc, char ** argv );
-static int Abc_CommandBmc            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandQbf            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 
 static int Abc_CommandFraig          ( Abc_Frame_t * pAbc, int argc, char ** argv );
@@ -173,6 +171,7 @@ static int Abc_CommandLcorr          ( Abc_Frame_t * pAbc, int argc, char ** arg
 static int Abc_CommandSeqCleanup     ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandCycle          ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandXsim           ( Abc_Frame_t * pAbc, int argc, char ** argv );
+static int Abc_CommandSim            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 
 static int Abc_CommandCec            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandDCec           ( Abc_Frame_t * pAbc, int argc, char ** argv );
@@ -181,7 +180,9 @@ static int Abc_CommandDSec           ( Abc_Frame_t * pAbc, int argc, char ** arg
 static int Abc_CommandSat            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandDSat           ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandProve          ( Abc_Frame_t * pAbc, int argc, char ** argv );
+static int Abc_CommandIProve         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandDebug          ( Abc_Frame_t * pAbc, int argc, char ** argv );
+static int Abc_CommandBmc            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 
 static int Abc_CommandTraceStart     ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandTraceCheck     ( Abc_Frame_t * pAbc, int argc, char ** argv );
@@ -294,10 +295,8 @@ void Abc_Init( Abc_Frame_t * pAbc )
     Cmd_CommandAdd( pAbc, "New AIG",      "ifraig",        Abc_CommandIFraig,           1 );
     Cmd_CommandAdd( pAbc, "New AIG",      "dfraig",        Abc_CommandDFraig,           1 );
     Cmd_CommandAdd( pAbc, "New AIG",      "csweep",        Abc_CommandCSweep,           1 );
-    Cmd_CommandAdd( pAbc, "New AIG",      "iprove",        Abc_CommandIProve,           1 );
     Cmd_CommandAdd( pAbc, "New AIG",      "haig",          Abc_CommandHaig,             1 );
     Cmd_CommandAdd( pAbc, "New AIG",      "mini",          Abc_CommandMini,             1 );
-    Cmd_CommandAdd( pAbc, "New AIG",      "_bmc",           Abc_CommandBmc,              0 );
     Cmd_CommandAdd( pAbc, "New AIG",      "qbf",           Abc_CommandQbf,              0 );
 
     Cmd_CommandAdd( pAbc, "Fraiging",     "fraig",         Abc_CommandFraig,            1 );
@@ -341,6 +340,7 @@ void Abc_Init( Abc_Frame_t * pAbc )
     Cmd_CommandAdd( pAbc, "Sequential",   "scleanup",      Abc_CommandSeqCleanup,       1 );
     Cmd_CommandAdd( pAbc, "Sequential",   "cycle",         Abc_CommandCycle,            1 );
     Cmd_CommandAdd( pAbc, "Sequential",   "xsim",          Abc_CommandXsim,             0 );
+    Cmd_CommandAdd( pAbc, "Sequential",   "sim",           Abc_CommandSim,              0 );
 
     Cmd_CommandAdd( pAbc, "Verification", "cec",           Abc_CommandCec,              0 );
     Cmd_CommandAdd( pAbc, "Verification", "dcec",          Abc_CommandDCec,             0 );
@@ -350,7 +350,9 @@ void Abc_Init( Abc_Frame_t * pAbc )
     Cmd_CommandAdd( pAbc, "Verification", "sat",           Abc_CommandSat,              0 );
     Cmd_CommandAdd( pAbc, "Verification", "dsat",          Abc_CommandDSat,             0 );
     Cmd_CommandAdd( pAbc, "Verification", "prove",         Abc_CommandProve,            1 );
+    Cmd_CommandAdd( pAbc, "Verification", "iprove",        Abc_CommandIProve,           1 );
     Cmd_CommandAdd( pAbc, "Verification", "debug",         Abc_CommandDebug,            0 );
+    Cmd_CommandAdd( pAbc, "Verification", "bmc",           Abc_CommandBmc,              0 );
 
 //    Cmd_CommandAdd( pAbc, "Verification", "trace_start",   Abc_CommandTraceStart,       0 );
 //    Cmd_CommandAdd( pAbc, "Verification", "trace_check",   Abc_CommandTraceCheck,       0 );
@@ -6337,8 +6339,8 @@ int Abc_CommandTest( Abc_Frame_t * pAbc, int argc, char ** argv )
 
 //    pNtkRes = Abc_NtkDar( pNtk );
 //    pNtkRes = Abc_NtkDarRetime( pNtk, nLevels, 1 );
-    pNtkRes = Abc_NtkPcmTest( pNtk, fVerbose );
-//    pNtkRes = NULL;
+//    pNtkRes = Abc_NtkPcmTest( pNtk, fVerbose );
+    pNtkRes = NULL;
     if ( pNtkRes == NULL )
     {
         fprintf( pErr, "Command has failed.\n" );
@@ -8100,89 +8102,6 @@ usage:
   SeeAlso     []
 
 ***********************************************************************/
-int Abc_CommandBmc( Abc_Frame_t * pAbc, int argc, char ** argv )
-{
-    FILE * pOut, * pErr;
-    Abc_Ntk_t * pNtk;
-    int c;
-    int nFrames;
-    int fInit;
-    int fVerbose;
-
-    extern void Abc_NtkBmc( Abc_Ntk_t * pNtk, int nFrames, int fInit, int fVerbose );
-
-    pNtk = Abc_FrameReadNtk(pAbc);
-    pOut = Abc_FrameReadOut(pAbc);
-    pErr = Abc_FrameReadErr(pAbc);
-
-    // set defaults
-    nFrames  = 5;
-    fInit    = 0;
-    fVerbose = 1;
-    Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "Kivh" ) ) != EOF )
-    {
-        switch ( c )
-        {
-        case 'K':
-            if ( globalUtilOptind >= argc )
-            {
-                fprintf( pErr, "Command line switch \"-R\" should be followed by an integer.\n" );
-                goto usage;
-            }
-            nFrames = atoi(argv[globalUtilOptind]);
-            globalUtilOptind++;
-            if ( nFrames < 0 ) 
-                goto usage;
-            break;
-        case 'i':
-            fInit ^= 1;
-            break;
-        case 'v':
-            fVerbose ^= 1;
-            break;
-        case 'h':
-            goto usage;
-        default:
-            goto usage;
-        }
-    }
-    if ( pNtk == NULL )
-    {
-        fprintf( pErr, "Empty network.\n" );
-        return 1;
-    }
-    if ( Abc_NtkIsStrash(pNtk) )
-        Abc_NtkBmc( pNtk, nFrames, fInit, fVerbose );
-    else
-    {
-        pNtk = Abc_NtkStrash( pNtk, 0, 1, 0 );
-        Abc_NtkBmc( pNtk, nFrames, fInit, fVerbose );
-        Abc_NtkDelete( pNtk );
-    }
-    return 0;
-
-usage:
-    fprintf( pErr, "usage: _bmc [-K num] [-ivh]\n" );
-    fprintf( pErr, "\t         perform bounded model checking\n" );
-    fprintf( pErr, "\t-K num : number of time frames [default = %d]\n", nFrames );
-    fprintf( pErr, "\t-i     : toggle initialization of the first frame [default = %s]\n", fInit? "yes": "no" );
-    fprintf( pErr, "\t-v     : toggle verbose output [default = %s]\n", fVerbose? "yes": "no" );
-    fprintf( pErr, "\t-h     : print the command usage\n");
-    return 1;
-}
- 
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
 int Abc_CommandQbf( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
     FILE * pOut, * pErr;
@@ -11659,6 +11578,103 @@ usage:
 }
 
 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_CommandSim( Abc_Frame_t * pAbc, int argc, char ** argv )
+{
+    FILE * pOut, * pErr;
+    Abc_Ntk_t * pNtk;
+    int c;
+    int nFrames;
+    int nWords;
+    int fVerbose;
+    extern int Abc_NtkDarSeqSim( Abc_Ntk_t * pNtk, int nFrames, int nWords, int fVerbose );
+
+    pNtk = Abc_FrameReadNtk(pAbc);
+    pOut = Abc_FrameReadOut(pAbc);
+    pErr = Abc_FrameReadErr(pAbc);
+
+    // set defaults
+    nFrames    = 32;
+    nWords     =  8;
+    fVerbose   =  0;
+    Extra_UtilGetoptReset();
+    while ( ( c = Extra_UtilGetopt( argc, argv, "FWvh" ) ) != EOF )
+    {
+        switch ( c )
+        {
+        case 'F':
+            if ( globalUtilOptind >= argc )
+            {
+                fprintf( pErr, "Command line switch \"-F\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nFrames = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nFrames < 0 ) 
+                goto usage;
+            break;
+        case 'W':
+            if ( globalUtilOptind >= argc )
+            {
+                fprintf( pErr, "Command line switch \"-W\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nWords = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nWords < 0 ) 
+                goto usage;
+            break;
+        case 'v':
+            fVerbose ^= 1;
+            break;
+        case 'h':
+            goto usage;
+        default:
+            goto usage;
+        }
+    }
+    if ( pNtk == NULL )
+    {
+        fprintf( pErr, "Empty network.\n" );
+        return 1;
+    }
+
+    if ( !Abc_NtkIsStrash(pNtk) )
+    {
+        fprintf( pErr, "Only works for strashed networks.\n" );
+        return 1;
+    }
+    if ( !Abc_NtkLatchNum(pNtk) )
+    {
+        fprintf( pErr, "Only works for sequential networks.\n" );
+        return 1;
+    }
+
+    FREE( pNtk->pSeqModel );
+    Abc_NtkDarSeqSim( pNtk, nFrames, nWords, fVerbose );        
+    return 0;
+
+usage:
+    fprintf( pErr, "usage: sim [-F num] [-W num] [-vh]\n" );
+    fprintf( pErr, "\t         performs random simulation of the sequentail miter\n" );
+    fprintf( pErr, "\t-F num : the number of frames to simulate [default = %d]\n", nFrames );
+    fprintf( pErr, "\t-W num : the number of words to simulate [default = %d]\n", nWords );
+    fprintf( pErr, "\t-v     : toggle printing verbose information [default = %s]\n", fVerbose? "yes": "no" );
+    fprintf( pErr, "\t-h     : print the command usage\n");
+    return 1;
+}
+
+
 
 /**Function*************************************************************
 
@@ -12787,6 +12803,102 @@ usage:
     fprintf( pErr, "\t-h    : print the command usage\n");
     return 1;
 }
+ 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_CommandBmc( Abc_Frame_t * pAbc, int argc, char ** argv )
+{
+    FILE * pOut, * pErr;
+    Abc_Ntk_t * pNtk;
+    int c;
+    int nFrames;
+    int nBTLimit;
+    int fRewrite;
+    int fVerbose;
+
+//    extern void Abc_NtkBmc( Abc_Ntk_t * pNtk, int nFrames, int fInit, int fVerbose );
+    extern int Abc_NtkDarBmc( Abc_Ntk_t * pNtk, int nFrames, int nBTLimit, int fRewrite, int fVerbose );
+
+    pNtk = Abc_FrameReadNtk(pAbc);
+    pOut = Abc_FrameReadOut(pAbc);
+    pErr = Abc_FrameReadErr(pAbc);
+
+    // set defaults
+    nFrames  = 5;
+    nBTLimit = 1000000;
+    fRewrite = 0;
+    fVerbose = 0;
+    Extra_UtilGetoptReset();
+    while ( ( c = Extra_UtilGetopt( argc, argv, "FCrvh" ) ) != EOF )
+    {
+        switch ( c )
+        {
+        case 'F':
+            if ( globalUtilOptind >= argc )
+            {
+                fprintf( pErr, "Command line switch \"-F\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nFrames = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nFrames < 0 ) 
+                goto usage;
+            break;
+        case 'C':
+            if ( globalUtilOptind >= argc )
+            {
+                fprintf( pErr, "Command line switch \"-C\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nBTLimit = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nBTLimit < 0 ) 
+                goto usage;
+            break;
+        case 'r':
+            fRewrite ^= 1;
+            break;
+        case 'v':
+            fVerbose ^= 1;
+            break;
+        case 'h':
+            goto usage;
+        default:
+            goto usage;
+        }
+    }
+    if ( pNtk == NULL )
+    {
+        fprintf( pErr, "Empty network.\n" );
+        return 1;
+    }
+    if ( !Abc_NtkIsStrash(pNtk) )
+    {
+        fprintf( stdout, "Currently only works for structurally hashed circuits.\n" );
+        return 0;
+    }
+    Abc_NtkDarBmc( pNtk, nFrames, nBTLimit, fRewrite, fVerbose );
+    return 0;
+
+usage:
+    fprintf( pErr, "usage: bmc [-F num] [-C num] [-rvh]\n" );
+    fprintf( pErr, "\t         perform bounded model checking\n" );
+    fprintf( pErr, "\t-F num : number of time frames [default = %d]\n", nFrames );
+    fprintf( pErr, "\t-C num : the max number of conflicts at a node [default = %d]\n", nBTLimit );
+    fprintf( pErr, "\t-r     : toggle initialization of the first frame [default = %s]\n", fRewrite? "yes": "no" );
+    fprintf( pErr, "\t-v     : toggle verbose output [default = %s]\n", fVerbose? "yes": "no" );
+    fprintf( pErr, "\t-h     : print the command usage\n");
+    return 1;
+}
 
 
 /**Function*************************************************************
diff --git a/src/base/abci/abcDar.c b/src/base/abci/abcDar.c
index abf79a82..ab8614fb 100644
--- a/src/base/abci/abcDar.c
+++ b/src/base/abci/abcDar.c
@@ -1070,6 +1070,44 @@ Abc_Ntk_t * Abc_NtkDarLcorr( Abc_Ntk_t * pNtk, int nFramesP, int nConfMax, int f
   SeeAlso     []
 
 ***********************************************************************/
+int Abc_NtkDarBmc( Abc_Ntk_t * pNtk, int nFrames, int nBTLimit, int fRewrite, int fVerbose )
+{
+    Aig_Man_t * pMan;
+    int clk = clock();
+    // derive the AIG manager
+    pMan = Abc_NtkToDar( pNtk, 1 );
+    if ( pMan == NULL )
+    {
+        printf( "Converting miter into AIG has failed.\n" );
+        return -1;
+    }
+    assert( pMan->nRegs > 0 );
+    // perform verification
+    Fra_BmcPerformSimple( pMan, nFrames, nBTLimit, fRewrite, fVerbose );
+    pNtk->pSeqModel = pMan->pSeqModel; pMan->pSeqModel = NULL;
+    if ( pNtk->pSeqModel )
+    {
+        Fra_Cex_t * pCex = pNtk->pSeqModel;
+        printf( "Output %d was asserted in frame %d (use \"write_counter\" to dump the trace). ", pCex->iPo, pCex->iFrame );
+    }
+    else
+        printf( "No output was asserted after BMC with %d frames. ", nFrames );
+PRT( "Time", clock() - clk );
+    Aig_ManStop( pMan );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Gives the current ABC network to AIG manager for processing.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
 int Abc_NtkDarProve( Abc_Ntk_t * pNtk, int nFrames, int fRetimeFirst, int fVerbose, int fVeryVerbose )
 {
     Aig_Man_t * pMan;
@@ -1084,6 +1122,12 @@ int Abc_NtkDarProve( Abc_Ntk_t * pNtk, int nFrames, int fRetimeFirst, int fVerbo
     assert( pMan->nRegs > 0 );
     // perform verification
     RetValue = Fra_FraigSec( pMan, nFrames, fRetimeFirst, fVerbose, fVeryVerbose );
+    pNtk->pSeqModel = pMan->pSeqModel; pMan->pSeqModel = NULL;
+    if ( pNtk->pSeqModel )
+    {
+        Fra_Cex_t * pCex = pNtk->pSeqModel;
+        printf( "Output %d was asserted in frame %d (use \"write_counter\" to dump the trace).\n", pCex->iPo, pCex->iFrame );
+    }
     Aig_ManStop( pMan );
     return RetValue;
 }
@@ -1238,6 +1282,46 @@ Abc_Ntk_t * Abc_NtkDarRetime( Abc_Ntk_t * pNtk, int nStepsMax, int fVerbose )
     return pNtkAig;
 }
 
+/**Function*************************************************************
+
+  Synopsis    [Performs random simulation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_NtkDarSeqSim( Abc_Ntk_t * pNtk, int nFrames, int nWords, int fVerbose )
+{
+    Aig_Man_t * pMan;
+    Fra_Sml_t * pSml;
+    Fra_Cex_t * pCex;
+    int RetValue, clk = clock();
+    pMan = Abc_NtkToDar( pNtk, 1 );
+    pSml = Fra_SmlSimulateSeq( pMan, 0, nFrames, nWords );
+    if ( pSml->fNonConstOut )
+    {
+        pCex = Fra_SmlGetCounterExample( pSml );
+        if ( pCex )
+            printf( "Simulation of %d frames with %d words asserted output %d in frame %d. ", 
+                nFrames, nWords, pCex->iPo, pCex->iFrame );
+        pNtk->pSeqModel = pCex;
+        RetValue = 1;
+    }
+    else
+    {
+        RetValue = 0;
+        printf( "Simulation of %d frames with %d words did not assert the outputs. ", 
+            nFrames, nWords );
+    }
+    PRT( "Time", clock() - clk );
+    Fra_SmlStop( pSml );
+    Aig_ManStop( pMan );
+    return RetValue;
+}
+
 ////////////////////////////////////////////////////////////////////////
 ///                       END OF FILE                                ///
 ////////////////////////////////////////////////////////////////////////
diff --git a/src/base/io/io.c b/src/base/io/io.c
index 7a5e4a5d..941ef7a7 100644
--- a/src/base/io/io.c
+++ b/src/base/io/io.c
@@ -1569,6 +1569,8 @@ usage:
     return 1;
 }
 
+#include "fra.h"
+
 /**Function*************************************************************
 
   Synopsis    []
@@ -1617,13 +1619,14 @@ int IoCommandWriteCounter( Abc_Frame_t * pAbc, int argc, char **argv )
     // get the input file name
     pFileName = argv[globalUtilOptind];
 
-    if ( pNtk->pModel == NULL )
+    if ( pNtk->pModel == NULL && pNtk->pSeqModel == NULL )
     {
         fprintf( pAbc->Out, "Counter-example is not available.\n" );
         return 0;
     }
 
     // write the counter-example into the file
+    if ( pNtk->pModel )
     {
         Abc_Obj_t * pObj;
         FILE * pFile = fopen( pFileName, "w" );
@@ -1646,12 +1649,50 @@ int IoCommandWriteCounter( Abc_Frame_t * pAbc, int argc, char **argv )
         fprintf( pFile, "\n" );
         fclose( pFile );
     }
+    else
+    {
+        Fra_Cex_t * pCex = pNtk->pSeqModel;
+        Abc_Obj_t * pObj;
+        FILE * pFile;
+        int i, f;
+        Abc_NtkForEachLatch( pNtk, pObj, i )
+            if ( !Abc_LatchIsInit0(pObj) )
+            {
+                fprintf( stdout, "IoCommandWriteCounter(): The init-state should be all-0 for counter-example to work.\n" );
+                fprintf( stdout, "Run commands \"undc\" and \"zero\" and then rerun the equivalence check.\n" );
+                return 1;
+            }
+
+        pFile = fopen( pFileName, "w" );
+        if ( pFile == NULL )
+        {
+            fprintf( stdout, "IoCommandWriteCounter(): Cannot open the output file \"%s\".\n", pFileName );
+            return 1;
+        }
+        if ( fNames )
+        {
+            Abc_NtkForEachLatch( pNtk, pObj, i )
+                fprintf( pFile, "%s@0=%c ", Abc_ObjName(Abc_ObjFanout0(pObj)), '0'+!Abc_LatchIsInit0(pObj) );
+            for ( f = 0; f <= pCex->iFrame; f++ )
+                Abc_NtkForEachPi( pNtk, pObj, i )
+                    fprintf( pFile, "%s@%d=%c ", Abc_ObjName(pObj), f, '0'+Abc_InfoHasBit(pCex->pData, pCex->nRegs+pCex->nPis*f + i) );
+        }
+        else
+        {
+            Abc_NtkForEachLatch( pNtk, pObj, i )
+                fprintf( pFile, "%c", '0'+!Abc_LatchIsInit0(pObj) );
+            for ( i = pCex->nRegs; i < pCex->nBits; i++ )
+                fprintf( pFile, "%c", '0'+Abc_InfoHasBit(pCex->pData, i) );
+        }
+        fprintf( pFile, "\n" );
+        fclose( pFile );
+    }
 
     return 0;
 
 usage:
     fprintf( pAbc->Err, "usage: write_counter [-nh] <file>\n" );
-    fprintf( pAbc->Err, "\t         writes the counter-example derived by \"prove\" or \"sat\"\n" );
+    fprintf( pAbc->Err, "\t         saves counter-example derived by \"sat\", \"iprove\", or \"dprove\"\n" );
     fprintf( pAbc->Err, "\t         the file contains values for each PI in the natural order\n" );
     fprintf( pAbc->Err, "\t-n     : write input names into the file [default = %s]\n", fNames? "yes": "no" );
     fprintf( pAbc->Err, "\t-h     : print the help massage\n" );