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/**CFile****************************************************************
FileName [sswSimSat.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Inductive prover with constraints.]
Synopsis [Performs resimulation using counter-examples.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - September 1, 2008.]
Revision [$Id: sswSimSat.c,v 1.00 2008/09/01 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sswInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Collects internal nodes in the reverse DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManCollectTfoCands_rec( Ssw_Man_t * p, Aig_Obj_t * pObj )
{
Aig_Obj_t * pFanout, * pRepr;
int iFanout = -1, i;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p->pAig, pObj) )
return;
Aig_ObjSetTravIdCurrent(p->pAig, pObj);
// traverse the fanouts
Aig_ObjForEachFanout( p->pAig, pObj, pFanout, iFanout, i )
Ssw_ManCollectTfoCands_rec( p, pFanout );
// check if the given node has a representative
pRepr = Aig_ObjRepr( p->pAig, pObj );
if ( pRepr == NULL )
return;
// pRepr is the constant 1 node
if ( pRepr == Aig_ManConst1(p->pAig) )
{
Vec_PtrPush( p->vSimRoots, pObj );
return;
}
// pRepr is the representative of the equivalence class
if ( Aig_ObjIsTravIdCurrent(p->pAig, pRepr) )
return;
Aig_ObjSetTravIdCurrent(p->pAig, pRepr);
Vec_PtrPush( p->vSimClasses, pRepr );
}
/**Function*************************************************************
Synopsis [Collect equivalence classes and const1 cands in the TFO.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManCollectTfoCands( Ssw_Man_t * p, Aig_Obj_t * pObj1, Aig_Obj_t * pObj2 )
{
Vec_PtrClear( p->vSimRoots );
Vec_PtrClear( p->vSimClasses );
Aig_ManIncrementTravId( p->pAig );
Aig_ObjSetTravIdCurrent( p->pAig, Aig_ManConst1(p->pAig) );
Ssw_ManCollectTfoCands_rec( p, pObj1 );
Ssw_ManCollectTfoCands_rec( p, pObj2 );
Vec_PtrSort( p->vSimRoots, Aig_ObjCompareIdIncrease );
Vec_PtrSort( p->vSimClasses, Aig_ObjCompareIdIncrease );
}
/**Function*************************************************************
Synopsis [Resimulates the cone of influence of the solved nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManResimulateSolved_rec( Ssw_Man_t * p, Aig_Obj_t * pObj, int f )
{
if ( Aig_ObjIsTravIdCurrent(p->pAig, pObj) )
return;
Aig_ObjSetTravIdCurrent(p->pAig, pObj);
if ( Aig_ObjIsPi(pObj) )
{
Aig_Obj_t * pObjFraig = Ssw_ObjFraig( p, pObj, f );
int nVarNum = Ssw_ObjSatNum( p, pObjFraig );
// get the value from the SAT solver
// (account for the fact that some vars may be minimized away)
pObj->fMarkB = !nVarNum? 0 : sat_solver_var_value( p->pSat, nVarNum );
return;
}
Ssw_ManResimulateSolved_rec( p, Aig_ObjFanin0(pObj), f );
Ssw_ManResimulateSolved_rec( p, Aig_ObjFanin1(pObj), f );
pObj->fMarkB = ( Aig_ObjFanin0(pObj)->fMarkB ^ Aig_ObjFaninC0(pObj) )
& ( Aig_ObjFanin1(pObj)->fMarkB ^ Aig_ObjFaninC1(pObj) );
}
/**Function*************************************************************
Synopsis [Resimulates the cone of influence of the other nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManResimulateOther_rec( Ssw_Man_t * p, Aig_Obj_t * pObj )
{
if ( Aig_ObjIsTravIdCurrent(p->pAig, pObj) )
return;
Aig_ObjSetTravIdCurrent(p->pAig, pObj);
if ( Aig_ObjIsPi(pObj) )
{
// set random value
pObj->fMarkB = Aig_ManRandom(0) & 1;
return;
}
Ssw_ManResimulateOther_rec( p, Aig_ObjFanin0(pObj) );
Ssw_ManResimulateOther_rec( p, Aig_ObjFanin1(pObj) );
pObj->fMarkB = ( Aig_ObjFanin0(pObj)->fMarkB ^ Aig_ObjFaninC0(pObj) )
& ( Aig_ObjFanin1(pObj)->fMarkB ^ Aig_ObjFaninC1(pObj) );
}
/**Function*************************************************************
Synopsis [Handle the counter-example.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManResimulateCex( Ssw_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pRepr, int f )
{
Aig_Obj_t * pRoot, ** ppClass;
int i, k, nSize, RetValue1, RetValue2, clk = clock();
// get the equivalence classes
Ssw_ManCollectTfoCands( p, pObj, pRepr );
// resimulate the cone of influence of the solved nodes
Aig_ManIncrementTravId( p->pAig );
Aig_ObjSetTravIdCurrent( p->pAig, Aig_ManConst1(p->pAig) );
Ssw_ManResimulateSolved_rec( p, pObj, f );
Ssw_ManResimulateSolved_rec( p, pRepr, f );
// resimulate the cone of influence of the other nodes
Vec_PtrForEachEntry( p->vSimRoots, pRoot, i )
Ssw_ManResimulateOther_rec( p, pRoot );
// refine these nodes
RetValue1 = Ssw_ClassesRefineConst1Group( p->ppClasses, p->vSimRoots, 0 );
// resimulate the cone of influence of the cand classes
RetValue2 = 0;
Vec_PtrForEachEntry( p->vSimClasses, pRoot, i )
{
ppClass = Ssw_ClassesReadClass( p->ppClasses, pRoot, &nSize );
for ( k = 0; k < nSize; k++ )
Ssw_ManResimulateOther_rec( p, ppClass[k] );
// refine this class
RetValue2 += Ssw_ClassesRefineOneClass( p->ppClasses, pRoot, 0 );
}
// make sure refinement happened
if ( Aig_ObjIsConst1(pRepr) )
assert( RetValue1 );
else
assert( RetValue2 );
p->timeSimSat += clock() - clk;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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