1 files changed, 115 insertions, 0 deletions
diff --git a/src/base/io/ioWriteCnf.c b/src/base/io/ioWriteCnf.c
new file mode 100644
index 00000000..e1b2d956
--- /dev/null
+++ b/src/base/io/ioWriteCnf.c
@@ -0,0 +1,115 @@
+/**CFile****************************************************************
+
+  FileName    [ioWriteCnf.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Command processing package.]
+
+  Synopsis    [Procedures to output CNF of the miter cone.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: ioWriteCnf.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "io.h"
+#include "satSolver.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+ 
+static Abc_Ntk_t * s_pNtk = NULL;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Write the miter cone into a CNF file for the SAT solver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Io_WriteCnf( Abc_Ntk_t * pNtk, char * pFileName, int fAllPrimes )
+{
+    sat_solver * pSat;
+    if ( Abc_NtkIsStrash(pNtk) )
+        printf( "Io_WriteCnf() warning: Generating CNF by applying heuristic AIG to CNF conversion.\n" );
+    else
+        printf( "Io_WriteCnf() warning: Generating CNF by convering logic nodes into CNF clauses.\n" );
+    if ( Abc_NtkPoNum(pNtk) != 1 )
+    {
+        fprintf( stdout, "Io_WriteCnf(): Currently can only process the miter (the network with one PO).\n" );
+        return 0;
+    }
+    if ( Abc_NtkLatchNum(pNtk) != 0 )
+    {
+        fprintf( stdout, "Io_WriteCnf(): Currently can only process the miter for combinational circuits.\n" );
+        return 0;
+    }
+    if ( Abc_NtkNodeNum(pNtk) == 0 )
+    {
+        fprintf( stdout, "The network has no logic nodes. No CNF file is generaled.\n" );
+        return 0;
+    }
+    // convert to logic BDD network
+    if ( Abc_NtkIsLogic(pNtk) )
+        Abc_NtkToBdd( pNtk );
+    // create solver with clauses
+    pSat = Abc_NtkMiterSatCreate( pNtk, fAllPrimes );
+    if ( pSat == NULL )
+    {
+        fprintf( stdout, "The problem is trivially UNSAT. No CNF file is generated.\n" );
+        return 1;
+    }        
+    // write the clauses
+    s_pNtk = pNtk;
+    Sat_SolverWriteDimacs( pSat, pFileName, 0, 0, 1 );
+    s_pNtk = NULL;
+    // free the solver
+    sat_solver_delete( pSat );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Output the mapping of PIs into variable numbers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Io_WriteCnfOutputPiMapping( FILE * pFile, int incrementVars )
+{
+    extern Vec_Int_t * Abc_NtkGetCiSatVarNums( Abc_Ntk_t * pNtk );
+    Abc_Ntk_t * pNtk = s_pNtk;
+    Vec_Int_t * vCiIds;
+    Abc_Obj_t * pObj;
+    int i;
+    vCiIds = Abc_NtkGetCiSatVarNums( pNtk );
+    fprintf( pFile, "c PI variable numbers: <PI_name> <SAT_var_number>\n" );
+    Abc_NtkForEachCi( pNtk, pObj, i )
+        fprintf( pFile, "c %s %d\n", Abc_ObjName(pObj), Vec_IntEntry(vCiIds, i) + (int)(incrementVars > 0) );
+    Vec_IntFree( vCiIds );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+