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/**CFile****************************************************************
FileName [sswSweep.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Inductive prover with constraints.]
Synopsis [One round of SAT sweeping.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - September 1, 2008.]
Revision [$Id: sswSweep.c,v 1.00 2008/09/01 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sswInt.h"
#include "bar.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Performs fraiging for one node.]
Description [Returns the fraiged node.]
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManSweepNode( Ssw_Man_t * p, Aig_Obj_t * pObj, int f )
{
Aig_Obj_t * pObjRepr, * pObjFraig, * pObjFraig2, * pObjReprFraig;
int RetValue;
// get representative of this class
pObjRepr = Aig_ObjRepr( p->pAig, pObj );
if ( pObjRepr == NULL )
return;
// get the fraiged node
pObjFraig = Ssw_ObjFraig( p, pObj, f );
if ( pObjFraig == NULL )
return;
// get the fraiged representative
pObjReprFraig = Ssw_ObjFraig( p, pObjRepr, f );
if ( pObjReprFraig == NULL )
return;
// if the fraiged nodes are the same, return
if ( Aig_Regular(pObjFraig) == Aig_Regular(pObjReprFraig) )
{
// remember the proved equivalence
// p->pReprsProved[ pObj->Id ] = pObjRepr;
return;
}
assert( Aig_Regular(pObjFraig) != Aig_ManConst1(p->pFrames) );
RetValue = Ssw_NodesAreEquiv( p, Aig_Regular(pObjReprFraig), Aig_Regular(pObjFraig) );
if ( RetValue == -1 ) // timed out
{
Ssw_ClassesRemoveNode( p->ppClasses, pObj );
p->fRefined = 1;
return;
}
if ( RetValue == 1 ) // proved equivalent
{
pObjFraig2 = Aig_NotCond( pObjReprFraig, pObj->fPhase ^ pObjRepr->fPhase );
Ssw_ObjSetFraig( p, pObj, f, pObjFraig2 );
// remember the proved equivalence
// p->pReprsProved[ pObj->Id ] = pObjRepr;
return;
}
// disproved the equivalence
Ssw_ManResimulateCex( p, pObj, pObjRepr, f );
assert( Aig_ObjRepr( p->pAig, pObj ) != pObjRepr );
p->fRefined = 1;
}
/**Function*************************************************************
Synopsis [Performs fraiging for the internal nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ssw_ManSweepBmc( Ssw_Man_t * p )
{
Bar_Progress_t * pProgress = NULL;
Aig_Obj_t * pObj, * pObjNew;
int i, f, clk;
clk = clock();
// start initialized timeframes
p->pFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->pPars->nFramesK );
Saig_ManForEachLo( p->pAig, pObj, i )
Ssw_ObjSetFraig( p, pObj, 0, Aig_ManConst0(p->pFrames) );
// sweep internal nodes
p->fRefined = 0;
pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(p->pAig) * p->pPars->nFramesK );
for ( f = 0; f < p->pPars->nFramesK; f++ )
{
// map constants and PIs
Ssw_ObjSetFraig( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(p->pFrames) );
Saig_ManForEachPi( p->pAig, pObj, i )
Ssw_ObjSetFraig( p, pObj, f, Aig_ObjCreatePi(p->pFrames) );
// sweep internal nodes
Aig_ManForEachNode( p->pAig, pObj, i )
{
Bar_ProgressUpdate( pProgress, Aig_ManObjNumMax(p->pAig) * f + i, NULL );
pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
Ssw_ObjSetFraig( p, pObj, f, pObjNew );
Ssw_ManSweepNode( p, pObj, f );
}
}
Bar_ProgressStop( pProgress );
// cleanup
Ssw_ClassesCheck( p->ppClasses );
Ssw_ManCleanup( p );
p->timeBmc += clock() - clk;
return p->fRefined;
}
/**Function*************************************************************
Synopsis [Performs fraiging for the internal nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ssw_ManSweep( Ssw_Man_t * p )
{
Bar_Progress_t * pProgress = NULL;
Aig_Obj_t * pObj, * pObj2, * pObjNew;
int nConstrPairs, clk, i, f = p->pPars->nFramesK;
// perform speculative reduction
clk = clock();
// create timeframes
p->pFrames = Ssw_FramesWithClasses( p );
p->nFrameNodes = Aig_ManNodeNum( p->pFrames );
// add constraints
nConstrPairs = Aig_ManPoNum(p->pFrames)-Aig_ManRegNum(p->pAig);
assert( (nConstrPairs & 1) == 0 );
for ( i = 0; i < nConstrPairs; i += 2 )
{
pObj = Aig_ManPo( p->pFrames, i );
pObj2 = Aig_ManPo( p->pFrames, i+1 );
Ssw_NodesAreConstrained( p, Aig_ObjFanin0(pObj), Aig_ObjFanin0(pObj2) );
}
// build logic cones for register inputs
for ( i = 0; i < Aig_ManRegNum(p->pAig); i++ )
{
pObj = Aig_ManPo( p->pFrames, nConstrPairs + i );
Ssw_CnfNodeAddToSolver( p, Aig_ObjFanin0(pObj) );
}
sat_solver_simplify( p->pSat );
p->timeReduce += clock() - clk;
// map constants and PIs
Ssw_ObjSetFraig( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(p->pFrames) );
Saig_ManForEachPi( p->pAig, pObj, i )
Ssw_ObjSetFraig( p, pObj, f, Aig_ObjCreatePi(p->pFrames) );
// sweep internal nodes
p->fRefined = 0;
pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(p->pAig) );
Aig_ManForEachNode( p->pAig, pObj, i )
{
Bar_ProgressUpdate( pProgress, i, NULL );
pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
Ssw_ObjSetFraig( p, pObj, f, pObjNew );
Ssw_ManSweepNode( p, pObj, f );
}
Bar_ProgressStop( pProgress );
// cleanup
Ssw_ClassesCheck( p->ppClasses );
Ssw_ManCleanup( p );
return p->fRefined;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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