Improvements to the QBF solver.

src/base/abci/abc.c

@@ -11016,14 +11016,16 @@ int Abc_CommandQbf( Abc_Frame_t * pAbc, int argc, char ** argv )
     Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
     int c;
     int nPars;
+    int nIters;
     int fVerbose;
 
-    extern void Abc_NtkQbf( Abc_Ntk_t * pNtk, int nPars, int fVerbose );
+    extern void Abc_NtkQbf( Abc_Ntk_t * pNtk, int nPars, int nIters, int fVerbose );
     // set defaults
     nPars    = -1;
+    nIters   = -1;
     fVerbose =  1;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "Pvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "PIvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -11038,6 +11040,17 @@ int Abc_CommandQbf( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( nPars < 0 ) 
                 goto usage;
             break;
+        case 'I':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-I\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nIters = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nIters < 0 ) 
+                goto usage;
+            break;
         case 'v':
             fVerbose ^= 1;
             break;
@@ -11068,19 +11081,20 @@ int Abc_CommandQbf( Abc_Frame_t * pAbc, int argc, char ** argv )
         return 1;
     }
     if ( Abc_NtkIsStrash(pNtk) )
-        Abc_NtkQbf( pNtk, nPars, fVerbose );
+        Abc_NtkQbf( pNtk, nPars, nIters, fVerbose );
     else
     {
         pNtk = Abc_NtkStrash( pNtk, 0, 1, 0 );
-        Abc_NtkQbf( pNtk, nPars, fVerbose );
+        Abc_NtkQbf( pNtk, nPars, nIters, fVerbose );
         Abc_NtkDelete( pNtk );
     }
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: qbf [-P num] [-vh]\n" );
+    Abc_Print( -2, "usage: qbf [-PI num] [-vh]\n" );
     Abc_Print( -2, "\t         solves QBF problem EpVxM(p,x)\n" );
     Abc_Print( -2, "\t-P num : number of parameters p (should be the first PIs) [default = %d]\n", nPars );
+    Abc_Print( -2, "\t-I num : quit after the given iteration even if unsolved [default = %d]\n", nIters );
     Abc_Print( -2, "\t-v     : toggle verbose output [default = %s]\n", fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h     : print the command usage\n");
     return 1;

src/base/abci/abcGen.c

@@ -442,8 +442,8 @@ void Abc_GenFpga( char * pFileName, int nLutSize, int nLuts, int nVars )
     fprintf( pFile, ".inputs" );
     for ( i = 0; i < nParsLut; i++ )
     {
-        if ( i % (1 << nLutSize) == 0 && i != (nLuts - 1) * (1 << nLutSize) )
+//        if ( i % (1 << nLutSize) == 0 && i != (nLuts - 1) * (1 << nLutSize) )
-            continue;
+//            continue;
         fprintf( pFile, " pl%02d", i );
     }
     fprintf( pFile, "\n" );

src/base/abci/abcQbf.c

@@ -41,6 +41,8 @@ static void Abc_NtkVectorClearVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int
 static void Abc_NtkVectorPrintPars( Vec_Int_t * vPiValues, int nPars );
 static void Abc_NtkVectorPrintVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int nPars );
 
+extern int Abc_NtkDSat( Abc_Ntk_t * pNtk, ABC_INT64_T nConfLimit, ABC_INT64_T nInsLimit, int fAlignPol, int fAndOuts, int fVerbose );
+
 ////////////////////////////////////////////////////////////////////////
 ///                     FUNCTION DEFINITIONS                         ///
 ////////////////////////////////////////////////////////////////////////
@@ -58,7 +60,7 @@ static void Abc_NtkVectorPrintVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int
   SeeAlso     []
 
 ***********************************************************************/
-void Abc_NtkQbf( Abc_Ntk_t * pNtk, int nPars, int fVerbose )
+void Abc_NtkQbf( Abc_Ntk_t * pNtk, int nPars, int nItersMax, int fVerbose )
 {
     Abc_Ntk_t * pNtkVer, * pNtkSyn, * pNtkSyn2, * pNtkTemp;
     Vec_Int_t * vPiValues;
@@ -74,6 +76,15 @@ void Abc_NtkQbf( Abc_Ntk_t * pNtk, int nPars, int fVerbose )
 
     // initialize the synthesized network with 0000-combination
     vPiValues = Vec_IntStart( Abc_NtkPiNum(pNtk) );
+
+    // create random init value
+    {
+    int i;
+    srand( time(NULL) );
+    for ( i = nPars; i < Abc_NtkPiNum(pNtk); i++ )
+        Vec_IntWriteEntry( vPiValues, i, rand() & 1 );
+    }
+
     Abc_NtkVectorClearPars( vPiValues, nPars );
     pNtkSyn = Abc_NtkMiterCofactor( pNtk, vPiValues );
     if ( fVerbose )
@@ -147,6 +158,8 @@ clkV = clock() - clkV;
             ABC_PRT( "Syn", clkS );
 //            ABC_PRT( "Ver", clkV );
         }
+        if ( nIters+1 == nItersMax )
+            break;
     }
     Abc_NtkDelete( pNtkSyn );
     // report the results
@@ -159,6 +172,8 @@ clkV = clock() - clkV;
     }
     else if ( nIters == nIterMax )
         printf( "Unsolved after %d interations.  ", nIters );
+    else if ( nIters == nItersMax )
+        printf( "Quit after %d interatios.  ", nItersMax );
     else
         printf( "Implementation does not exist.  " );
     ABC_PRT( "Total runtime", clock() - clkTotal );