Adding switch &fftest -N <num> to detect fixed vars after each <num> iterations.

src/base/abci/abc.c

@@ -35635,7 +35635,7 @@ int Abc_CommandAbc9FFTest( Abc_Frame_t * pAbc, int argc, char ** argv )
     int c;
     Gia_ParFfSetDefault( pPars );
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "ATSGsbduvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "ATNSGsbduvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -35661,6 +35661,17 @@ int Abc_CommandAbc9FFTest( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( pPars->nTimeOut < 0 )
                 goto usage;
             break;
+        case 'N':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-N\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            pPars->nIterCheck = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( pPars->nIterCheck < 0 )
+                goto usage;
+            break;
         case 'S':
             if ( globalUtilOptind >= argc )
             {
@@ -35769,7 +35780,7 @@ int Abc_CommandAbc9FFTest( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: &fftest [-AT num] [-sbduvh] <file> [-G file] [-S str]\n" );
+    Abc_Print( -2, "usage: &fftest [-ATN num] [-sbduvh] <file> [-G file] [-S str]\n" );
     Abc_Print( -2, "\t          performs functional fault test generation\n" );
     Abc_Print( -2, "\t-A num  : selects fault model for all gates [default = %d]\n", pPars->Algo );
     Abc_Print( -2, "\t                0: fault model is not selected (use -S str)\n" );
@@ -35778,6 +35789,7 @@ usage:
     Abc_Print( -2, "\t                3: complement fault: -S ((a&b)^p)\n" );
     Abc_Print( -2, "\t                4: functionally observable fault\n" );
     Abc_Print( -2, "\t-T num  : specifies approximate runtime limit in seconds [default = %d]\n",        pPars->nTimeOut );
+    Abc_Print( -2, "\t-N num  : specifies iteration to check for fixed parameters [default = %d]\n",     pPars->nIterCheck );
     Abc_Print( -2, "\t-s      : toggles starting with the all-0 and all-1 patterns [default = %s]\n",    pPars->fStartPats?  "yes": "no" );
     Abc_Print( -2, "\t-b      : toggles testing for single faults only [default = %s]\n",                pPars->fBasic?      "yes": "no" );
     Abc_Print( -2, "\t-d      : toggles dumping test patterns into file \"tests.txt\" [default = %s]\n", pPars->fDump?       "yes": "no" );

src/sat/bmc/bmc.h

@@ -129,6 +129,7 @@ struct Bmc_ParFf_t_
     int        fComplVars;
     int        fStartPats;
     int        nTimeOut;
+    int        nIterCheck;
     int        fBasic;
     int        fDump;
     int        fDumpUntest;

src/sat/bmc/bmcFault.c

@@ -55,6 +55,7 @@ void Gia_ParFfSetDefault( Bmc_ParFf_t * p )
     p->Algo          =     0; 
     p->fStartPats    =     0; 
     p->nTimeOut      =     0; 
+    p->nIterCheck    =     0;
     p->fBasic        =     0; 
     p->fDump         =     0; 
     p->fDumpUntest   =     0; 
@@ -802,12 +803,60 @@ Gia_Man_t * Gia_ManDeriveDup( Gia_Man_t * p, int nPisNew )
   SeeAlso     []
 
 ***********************************************************************/
+int Gia_ManFaultAnalyze( sat_solver * pSat, Vec_Int_t * vPars, Vec_Int_t * vLits, int Iter )
+{
+    int status, i, v, iVar, Lit;
+    int nUnsats = 0, nRuns = 0;
+    abctime clk = Abc_Clock();
+    Vec_IntFill( vLits, Vec_IntSize(vPars), 0 );
+    for ( v = 0; v < Vec_IntSize(vPars); v++ )
+    {
+        if ( Vec_IntEntry(vLits, v) )
+            continue;
+        nRuns++;
+        Lit = Abc_Var2Lit( Vec_IntEntry(vPars, v), 0 );
+        status = sat_solver_solve( pSat, &Lit, &Lit+1, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
+        if ( status == l_Undef )
+        {
+            //printf( "Var %d timed out\n", v );
+            continue;
+        }
+        if ( status == l_False )
+        {
+            nUnsats++;
+            //printf( "Var %d is UNSAT\n", v );
+            Lit = Abc_LitNot(Lit);
+            //status = sat_solver_addclause( pSat, &Lit, &Lit+1 );
+            //assert( status );
+            continue;
+        }
+        Vec_IntForEachEntry( vPars, iVar, i )
+            if ( !Vec_IntEntry(vLits, i) && sat_solver_var_value(pSat, iVar) )
+                Vec_IntWriteEntry( vLits, i, 1 );
+        assert( Vec_IntEntry(vLits, v) == 1 );
+    }
+    printf( "Iteration %3d has determined %5d (out of %5d) parameters after %6d SAT calls.  ", Iter, nUnsats, Vec_IntSize(vPars), nRuns );
+    Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+    return nUnsats;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
 void Gia_ManFaultTest( Gia_Man_t * p, Gia_Man_t * pG, Bmc_ParFf_t * pPars )
 {
     int nIterMax = 1000000, nVars, nPars;
     int i, Iter, Iter2, status, nFuncVars = -1;
     abctime clkSat = 0, clkTotal = Abc_Clock();
-    Vec_Int_t * vLits, * vTests;
+    Vec_Int_t * vLits, * vTests, * vPars = NULL;
     Gia_Man_t * p0 = NULL, * p1 = NULL, * pM;
     Gia_Obj_t * pObj;
     Cnf_Dat_t * pCnf;
@@ -1015,6 +1064,18 @@ void Gia_ManFaultTest( Gia_Man_t * p, Gia_Man_t * pG, Bmc_ParFf_t * pPars )
         Vec_IntAppend( vTests, vLits );
         // add constraint
         Gia_ManFaultAddOne( pM, pCnf, pSat, vLits, nFuncVars );
+        // collect parameter variables
+        if ( pPars->nIterCheck && vPars == NULL )
+        {
+            vPars = Vec_IntAlloc( Gia_ManPiNum(pM) - nFuncVars );
+            Gia_ManForEachPi( pM, pObj, i )
+                if ( i >= nFuncVars )
+                    Vec_IntPush( vPars, pCnf->pVarNums[Gia_ObjId(pM, pObj)] );
+            assert( Vec_IntSize(vPars) == Gia_ManPiNum(pM) - nFuncVars );
+        }
+        // derive unit parameter variables
+        if ( pPars->nIterCheck && !(Iter % pPars->nIterCheck) )
+            Gia_ManFaultAnalyze( pSat, vPars, vLits, Iter );
     }
 finish:
     // print results
@@ -1142,6 +1203,7 @@ finish:
     Gia_ManStop( pM );
     Vec_IntFree( vTests );
     Vec_IntFree( vLits );
+    Vec_IntFreeP( &vPars );
 }