Experiments with generating sat assignments.

src/sat/bmc/bmcGen.c

+/**CFile****************************************************************
+
+  FileName    [bmcGen.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [SAT-based bounded model checking.]
+
+  Synopsis    [Generating satisfying assignments.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bmcGen.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bmc.h"
+#include "sat/cnf/cnf.h"
+#include "sat/bsat/satStore.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+extern Cnf_Dat_t * Mf_ManGenerateCnf( Gia_Man_t * pGia, int nLutSize, int fCnfObjIds, int fAddOrCla, int fVerbose );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline word * Gia_ManMoObj( Gia_Man_t * p, int iObj )
+{
+    return Vec_WrdEntryP( p->vSims, iObj * p->iPatsPi );
+}
+static inline void Gia_ManMoSetCi( Gia_Man_t * p, int iObj )
+{
+    int w;
+    word * pSims = Gia_ManMoObj( p, iObj );
+    for ( w = 0; w < p->iPatsPi; w++ )
+        pSims[w] = Gia_ManRandomW( 0 );
+}
+static inline void Gia_ManMoSimAnd( Gia_Man_t * p, int iObj )
+{
+    int w;
+    Gia_Obj_t * pObj = Gia_ManObj( p, iObj );
+    word * pSims  = Gia_ManMoObj( p, iObj );
+    word * pSims0 = Gia_ManMoObj( p, Gia_ObjFaninId0(pObj, iObj) );
+    word * pSims1 = Gia_ManMoObj( p, Gia_ObjFaninId1(pObj, iObj) );
+    if ( Gia_ObjFaninC0(pObj) )
+    {
+        if (  Gia_ObjFaninC1(pObj) )
+            for ( w = 0; w < p->iPatsPi; w++ )
+                pSims[w] = ~(pSims0[w] | pSims1[w]);
+        else 
+            for ( w = 0; w < p->iPatsPi; w++ )
+                pSims[w] = ~pSims0[w] & pSims1[w];
+    }
+    else 
+    {
+        if (  Gia_ObjFaninC1(pObj) )
+            for ( w = 0; w < p->iPatsPi; w++ )
+                pSims[w] = pSims0[w] & ~pSims1[w];
+        else 
+            for ( w = 0; w < p->iPatsPi; w++ )
+                pSims[w] = pSims0[w] & pSims1[w];
+    }
+}
+static inline void Gia_ManMoSetCo( Gia_Man_t * p, int iObj )
+{
+    int w;
+    Gia_Obj_t * pObj  = Gia_ManObj( p, iObj );
+    word * pSims  = Gia_ManMoObj( p, iObj );
+    word * pSims0 = Gia_ManMoObj( p, Gia_ObjFaninId0(pObj, iObj) );
+    if ( Gia_ObjFaninC0(pObj) )
+    {
+        for ( w = 0; w < p->iPatsPi; w++ )
+            pSims[w] = ~pSims0[w];
+    }
+    else 
+    {
+        for ( w = 0; w < p->iPatsPi; w++ )
+            pSims[w] = pSims0[w];
+    }
+}
+void Gia_ManMoFindSimulate( Gia_Man_t * p, int nWords )
+{
+    int i, iObj;
+    Gia_ManRandomW( 1 );
+    p->iPatsPi = nWords;
+    if ( p->vSims )
+        Vec_WrdFill( p->vSims, nWords * Gia_ManObjNum(p), 0 );
+    else
+        p->vSims = Vec_WrdStart( nWords * Gia_ManObjNum(p) );
+    Gia_ManForEachCiId( p, iObj, i )
+        Gia_ManMoSetCi( p, iObj );
+    Gia_ManForEachAndId( p, iObj )
+        Gia_ManMoSimAnd( p, iObj );
+    Gia_ManForEachCoId( p, iObj, i )
+        Gia_ManMoSetCo( p, iObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Gia_ManTestSatEnum( Gia_Man_t * p )
+{
+    abctime clk = Abc_Clock(), clk2, clkTotal = 0;
+    Cnf_Dat_t * pCnf = Mf_ManGenerateCnf( p, 8, 0, 0, 0 );
+    sat_solver * pSat = (sat_solver *)Cnf_DataWriteIntoSolver(pCnf, 1, 0);
+    int i, v, status, iLit, nWords = 1, iOutVar = 1, Count = 0;
+    Vec_Int_t * vVars = Vec_IntAlloc( 1000 );
+    word * pSimInfo;
+
+    // add literals to the solver
+    iLit  = Abc_Var2Lit( iOutVar, 0 ); 
+    status = sat_solver_addclause( pSat, &iLit, &iLit + 1 );
+    assert( status );
+
+    // simulate the AIG
+    Gia_ManMoFindSimulate( p, nWords );
+
+    // print outputs
+    pSimInfo = Gia_ManMoObj( p, Gia_ObjId(p, Gia_ManCo(p, 0)) );
+    for ( i = 0; i < 64*nWords; i++ )
+        printf( "%d", Abc_InfoHasBit( (unsigned *)pSimInfo, i ) );
+    printf( "\n" );
+
+    // iterate through the assignments
+    for ( i = 0; i < 64*nWords; i++ )
+    {
+        Vec_IntClear( vVars );
+        for ( v = 0; v < Gia_ManObjNum(p); v++ )
+        {
+            if ( pCnf->pVarNums[v] == -1 )
+                continue;
+            pSimInfo = Gia_ManMoObj( p, v );
+            if ( !Abc_InfoHasBit( (unsigned *)pSimInfo, i ) )
+                continue;
+            Vec_IntPush( vVars, pCnf->pVarNums[v] );
+        }
+        //sat_solver_act_var_clear( pSat );
+        sat_solver_set_polarity( pSat, Vec_IntArray(vVars), Vec_IntSize(vVars) );
+
+        clk2 = Abc_Clock();
+        status = sat_solver_solve( pSat, NULL, NULL, 0, 0, 0, 0 );
+        clkTotal += Abc_Clock() - clk2;
+        printf( "%c", status == l_True ? '+' : '-' );
+        if ( status == l_True )
+            Count++;
+    }
+    printf( "\n" );
+    printf( "Finished generating %d assignments.  ", Count );
+    Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+    Abc_PrintTime( 1, "SAT solver time", clkTotal );
+
+    Vec_WrdFreeP( &p->vSims );
+    Vec_IntFree( vVars );
+    sat_solver_delete( pSat );
+    Cnf_DataFree( pCnf );
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+

src/sat/bmc/module.make

@@ -16,6 +16,7 @@ SRC +=    src/sat/bmc/bmcBCore.c \
     src/sat/bmc/bmcExpand.c \
     src/sat/bmc/bmcFault.c \
     src/sat/bmc/bmcFx.c \
+    src/sat/bmc/bmcGen.c \
     src/sat/bmc/bmcICheck.c \
     src/sat/bmc/bmcInse.c \
     src/sat/bmc/bmcLoad.c \