Adding features for invariant minimization.

1 files changed, 225 insertions, 0 deletions

diff --git a/src/sat/bmc/bmcEnum.c b/src/sat/bmc/bmcEnum.c
new file mode 100644
index 00000000..5fe2c1ed
--- /dev/null
+++ b/src/sat/bmc/bmcEnum.c
@@ -0,0 +1,225 @@
+/**CFile****************************************************************
+
+  FileName    [bmcEnum.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [SAT-based bounded model checking.]
+
+  Synopsis    [Enumeration.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bmcEnum.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bmc.h"
+#include "sat/cnf/cnf.h"
+#include "sat/bsat/satSolver.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     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManDeriveOne( Gia_Man_t * p, Vec_Int_t * vValues )
+{
+    Gia_Man_t * pNew;
+    Gia_Obj_t * pObj; int i, fPhase0, fPhase1;
+    assert( Vec_IntSize(vValues) == Gia_ManCiNum(p) );
+    // propagate forward
+    Gia_ManForEachCi( p, pObj, i )
+        pObj->fPhase = Vec_IntEntry(vValues, i);
+    Gia_ManForEachAnd( p, pObj, i )
+    {
+        fPhase0 = Gia_ObjPhase(Gia_ObjFanin0(pObj)) ^ Gia_ObjFaninC0(pObj);
+        fPhase1 = Gia_ObjPhase(Gia_ObjFanin1(pObj)) ^ Gia_ObjFaninC1(pObj);
+        pObj->fPhase = fPhase0 & fPhase1;
+    }
+    // propagate backward
+    Gia_ManCleanMark0(p);
+    Gia_ManForEachCo( p, pObj, i )
+        Gia_ObjFanin0(pObj)->fMark0 = 1;
+    Gia_ManForEachAndReverse( p, pObj, i )
+    {
+        if ( !pObj->fMark0 )
+            continue;
+        fPhase0 = Gia_ObjPhase(Gia_ObjFanin0(pObj)) ^ Gia_ObjFaninC0(pObj);
+        fPhase1 = Gia_ObjPhase(Gia_ObjFanin1(pObj)) ^ Gia_ObjFaninC1(pObj);
+        if ( fPhase0 == fPhase1 )
+        {
+            assert( (int)pObj->fPhase == fPhase0 );
+            Gia_ObjFanin0(pObj)->fMark0 = 1;
+            Gia_ObjFanin1(pObj)->fMark0 = 1;
+        }
+        else if ( fPhase0 )
+        {
+            assert( fPhase1 == 0 );
+            assert( pObj->fPhase == 0 );
+            Gia_ObjFanin1(pObj)->fMark0 = 1;
+        }
+        else if ( fPhase1 )
+        {
+            assert( fPhase0 == 0 );
+            assert( pObj->fPhase == 0 );
+            Gia_ObjFanin0(pObj)->fMark0 = 1;
+        }
+    }
+    // create new
+    Gia_ManFillValue( p );
+    pNew = Gia_ManStart( Gia_ManObjNum(p) );
+    pNew->pName = Abc_UtilStrsav( p->pName );
+    pNew->pSpec = Abc_UtilStrsav( p->pSpec );
+    Gia_ManConst0(p)->Value = 0;
+    Gia_ManForEachCi( p, pObj, i )
+        pObj->Value = Abc_LitNotCond( Gia_ManAppendCi(pNew), !Vec_IntEntry(vValues, i) );
+    Gia_ManForEachAnd( p, pObj, i )
+    {
+        if ( !pObj->fMark0 )
+            continue;
+        fPhase0 = Gia_ObjPhase(Gia_ObjFanin0(pObj)) ^ Gia_ObjFaninC0(pObj);
+        fPhase1 = Gia_ObjPhase(Gia_ObjFanin1(pObj)) ^ Gia_ObjFaninC1(pObj);
+        if ( fPhase0 == fPhase1 )
+        {
+            assert( (int)pObj->fPhase == fPhase0 );
+            if ( pObj->fPhase )
+                pObj->Value = Gia_ManAppendAnd( pNew, Gia_ObjFanin0(pObj)->Value, Gia_ObjFanin1(pObj)->Value );
+            else
+                pObj->Value = Gia_ManAppendOr( pNew, Gia_ObjFanin0(pObj)->Value, Gia_ObjFanin1(pObj)->Value );
+        }
+        else if ( fPhase0 )
+        {
+            assert( fPhase1 == 0 );
+            assert( pObj->fPhase == 0 );
+            pObj->Value = Gia_ObjFanin1(pObj)->Value;
+        }
+        else if ( fPhase1 )
+        {
+            assert( fPhase0 == 0 );
+            assert( pObj->fPhase == 0 );
+            pObj->Value = Gia_ObjFanin0(pObj)->Value;
+        }
+    }
+    Gia_ManForEachCo( p, pObj, i )
+        Gia_ManAppendCo( pNew, Gia_ObjFanin0(pObj)->Value );
+    Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
+    Gia_ManCleanMark0(p);
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManDeriveOneTest2( Gia_Man_t * p )
+{
+    Gia_Man_t * pNew;
+    Vec_Int_t * vValues = Vec_IntStart( Gia_ManCiNum(p) );
+    //Vec_IntFill( vValues, Gia_ManCiNum(p), 1 );
+    pNew = Gia_ManDeriveOne( p, vValues );
+    Vec_IntFree( vValues );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManDeriveOneTest( Gia_Man_t * p )
+{
+    int fVerbose = 1;
+    Gia_Man_t * pNew;
+    Gia_Obj_t * pObj, * pRoot;
+    Vec_Int_t * vValues = Vec_IntStart( Gia_ManCiNum(p) );
+    Cnf_Dat_t * pCnf = Mf_ManGenerateCnf( p, 8, 0, 0, 0 );
+    int i, iVar, nIter, iPoVarBeg = pCnf->nVars - Gia_ManCiNum(p);
+    sat_solver * pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 );
+    Vec_Int_t * vLits = Vec_IntAlloc( 100 );
+    Vec_IntPush( vLits, Abc_Var2Lit( 1, 1 ) );
+    for ( nIter = 0; nIter < 10000; nIter++ )
+    {
+        int status = sat_solver_solve( pSat, Vec_IntArray(vLits), Vec_IntLimit(vLits), 0, 0, 0, 0 );
+        if ( status == l_False ) 
+            break;
+        // derive new set
+        assert( status == l_True );
+        for ( i = 0; i < Gia_ManCiNum(p); i++ )
+        {
+            Vec_IntWriteEntry( vValues, i, sat_solver_var_value(pSat, iPoVarBeg+i) );
+            printf( "%d", sat_solver_var_value(pSat, iPoVarBeg+i) );
+        }
+        printf( " : " );
+
+        pNew = Gia_ManDeriveOne( p, vValues );
+        // assign variables
+        Gia_ManForEachCi( pNew, pObj, i )
+            pObj->Value = iPoVarBeg+i;
+        iVar = sat_solver_nvars(pSat);
+        Gia_ManForEachAnd( pNew, pObj, i )
+            pObj->Value = iVar++;
+        sat_solver_setnvars( pSat, iVar );
+        // create new clauses
+        Gia_ManForEachAnd( pNew, pObj, i )
+            sat_solver_add_and( pSat, pObj->Value, Gia_ObjFanin0(pObj)->Value, Gia_ObjFanin1(pObj)->Value, Gia_ObjFaninC0(pObj), Gia_ObjFaninC1(pObj), 0 );
+        // add to the assumptions
+        pRoot = Gia_ManCo(pNew, 0);
+        Vec_IntPush( vLits, Abc_Var2Lit(Gia_ObjFanin0(pRoot)->Value, !Gia_ObjFaninC0(pRoot)) );
+        if ( fVerbose )
+        {
+            printf( "Iter = %5d : ", nIter );
+            printf( "And = %4d ", Gia_ManAndNum(pNew) );
+            printf( "\n" );
+        }
+        Gia_ManStop( pNew );
+    }
+    Vec_IntFree( vLits );
+    Vec_IntFree( vValues );
+    Cnf_DataFree( pCnf );
+    sat_solver_delete( pSat );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+