sswConstr.c File Reference

#include "sswInt.h"
#include "sat/cnf/cnf.h"
#include "misc/bar/bar.h"

Go to the source code of this file.

Functions
ABC_NAMESPACE_IMPL_START Aig_Man_t *	Ssw_FramesWithConstraints (Aig_Man_t *p, int nFrames)
	DECLARATIONS ///. More...
int	Ssw_ManSetConstrPhases (Aig_Man_t *p, int nFrames, Vec_Int_t **pvInits)
int	Ssw_ManSetConstrPhases_ (Aig_Man_t *p, int nFrames, Vec_Int_t **pvInits)
void	Ssw_ManPrintPolarity (Aig_Man_t *p)
void	Ssw_ManRefineByConstrSim (Ssw_Man_t *p)
int	Ssw_ManSweepNodeConstr (Ssw_Man_t *p, Aig_Obj_t *pObj, int f, int fBmc)
Aig_Obj_t *	Ssw_ManSweepBmcConstr_rec (Ssw_Man_t *p, Aig_Obj_t *pObj, int f)
int	Ssw_ManSweepBmcConstr_old (Ssw_Man_t *p)
int	Ssw_ManSweepBmcConstr (Ssw_Man_t *p)
Aig_Obj_t *	Ssw_FramesWithClasses_rec (Ssw_Man_t *p, Aig_Obj_t *pObj, int f)
int	Ssw_ManSweepConstr (Ssw_Man_t *p)

Function Documentation

Aig_Obj_t* Ssw_FramesWithClasses_rec	(	Ssw_Man_t *	p,
		Aig_Obj_t *	pObj,
		int	f
	)

Function*************************************************************

Synopsis [Performs fraiging for the internal nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 581 of file sswConstr.c.

{
    Aig_Obj_t * pObjNew, * pObjLi;
    pObjNew = Ssw_ObjFrame( p, pObj, f );
    if ( pObjNew )
        return pObjNew;
    assert( !Saig_ObjIsPi(p->pAig, pObj) );
    if ( Saig_ObjIsLo(p->pAig, pObj) )
    {
        assert( f > 0 );
        pObjLi  = Saig_ObjLoToLi( p->pAig, pObj );
        pObjNew = Ssw_FramesWithClasses_rec( p, Aig_ObjFanin0(pObjLi), f-1 );
        pObjNew = Aig_NotCond( pObjNew, Aig_ObjFaninC0(pObjLi) );
    }
    else
    {
        assert( Aig_ObjIsNode(pObj) );
        Ssw_FramesWithClasses_rec( p, Aig_ObjFanin0(pObj), f );
        Ssw_FramesWithClasses_rec( p, Aig_ObjFanin1(pObj), f );
        pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
    }
    Ssw_ObjSetFrame( p, pObj, f, pObjNew );
    assert( pObjNew != NULL );
    return pObjNew;
}

ABC_NAMESPACE_IMPL_START Aig_Man_t* Ssw_FramesWithConstraints	(	Aig_Man_t *	p,
		int	nFrames
	)

DECLARATIONS ///.

CFile****************************************************************

FileName [sswConstr.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:

sswConstr.c,v 1.00 2008/09/01 00:00:00 alanmi Exp

]FUNCTION DEFINITIONS /// Function*************************************************************

Synopsis [Constructs initialized timeframes with constraints as POs.]

Description []

SideEffects []

SeeAlso []

Definition at line 47 of file sswConstr.c.

{
    Aig_Man_t * pFrames;
    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
    int i, f;
//    assert( Saig_ManConstrNum(p) > 0 );
    assert( Aig_ManRegNum(p) > 0 );
    assert( Aig_ManRegNum(p) < Aig_ManCiNum(p) );
    // start the fraig package
    pFrames = Aig_ManStart( Aig_ManObjNumMax(p) * nFrames );
    // create latches for the first frame
    Saig_ManForEachLo( p, pObj, i )
        Aig_ObjSetCopy( pObj, Aig_ManConst0(pFrames) );
    // add timeframes
    for ( f = 0; f < nFrames; f++ )
    {
        // map constants and PIs
        Aig_ObjSetCopy( Aig_ManConst1(p), Aig_ManConst1(pFrames) );
        Saig_ManForEachPi( p, pObj, i )
            Aig_ObjSetCopy( pObj, Aig_ObjCreateCi(pFrames) );
        // add internal nodes of this frame
        Aig_ManForEachNode( p, pObj, i )
            Aig_ObjSetCopy( pObj, Aig_And( pFrames, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) ) );
        // transfer to the primary output
        Aig_ManForEachCo( p, pObj, i )
            Aig_ObjSetCopy( pObj, Aig_ObjChild0Copy(pObj) );
        // create constraint outputs
        Saig_ManForEachPo( p, pObj, i )
        {
            if ( i < Saig_ManPoNum(p) - Saig_ManConstrNum(p) )
                continue;
            Aig_ObjCreateCo( pFrames, Aig_Not( Aig_ObjCopy(pObj) ) );
        }
        // transfer latch inputs to the latch outputs
        Saig_ManForEachLiLo( p, pObjLi, pObjLo, i )
            Aig_ObjSetCopy( pObjLo, Aig_ObjCopy(pObjLi) );
    }
    // remove dangling nodes
    Aig_ManCleanup( pFrames );
    return pFrames;
}

void Ssw_ManPrintPolarity

(

Aig_Man_t *

p

)

Function*************************************************************

Synopsis [Performs fraiging for one node.]

Description [Returns the fraiged node.]

SideEffects []

SeeAlso []

Definition at line 227 of file sswConstr.c.

{
    Aig_Obj_t * pObj;
    int i;
    Aig_ManForEachObj( p, pObj, i )
        Abc_Print( 1, "%d", pObj->fPhase );
    Abc_Print( 1, "\n" );
}

void Ssw_ManRefineByConstrSim

(

Ssw_Man_t *

p

)

Function*************************************************************

Synopsis [Performs fraiging for one node.]

Description [Returns the fraiged node.]

SideEffects []

SeeAlso []

Definition at line 247 of file sswConstr.c.

{
    Aig_Obj_t * pObj, * pObjLi;
    int f, i, iLits, RetValue1, RetValue2;
    int nFrames = Vec_IntSize(p->vInits) / Saig_ManPiNum(p->pAig);
    assert( Vec_IntSize(p->vInits) % Saig_ManPiNum(p->pAig) == 0 );
    // assign register outputs
    Saig_ManForEachLi( p->pAig, pObj, i )
        pObj->fMarkB = 0;
    // simulate the timeframes
    iLits = 0;
    for ( f = 0; f < nFrames; f++ )
    {
        // set the PI simulation information
        Aig_ManConst1(p->pAig)->fMarkB = 1;
        Saig_ManForEachPi( p->pAig, pObj, i )
            pObj->fMarkB = Vec_IntEntry( p->vInits, iLits++ );
        Saig_ManForEachLiLo( p->pAig, pObjLi, pObj, i )
            pObj->fMarkB = pObjLi->fMarkB;
        // simulate internal nodes
        Aig_ManForEachNode( p->pAig, pObj, i )
            pObj->fMarkB = ( Aig_ObjFanin0(pObj)->fMarkB ^ Aig_ObjFaninC0(pObj) )
                         & ( Aig_ObjFanin1(pObj)->fMarkB ^ Aig_ObjFaninC1(pObj) );
        // assign the COs
        Aig_ManForEachCo( p->pAig, pObj, i )
            pObj->fMarkB = ( Aig_ObjFanin0(pObj)->fMarkB ^ Aig_ObjFaninC0(pObj) );
        // check the outputs
        Saig_ManForEachPo( p->pAig, pObj, i )
        {
            if ( i < Saig_ManPoNum(p->pAig) - Saig_ManConstrNum(p->pAig) )
            {
                if ( pObj->fMarkB && Saig_ManConstrNum(p->pAig) )
                    Abc_Print( 1, "output %d failed in frame %d.\n", i, f );
            }
            else
            {
                if ( pObj->fMarkB && Saig_ManConstrNum(p->pAig) )
                    Abc_Print( 1, "constraint %d failed in frame %d.\n", i, f );
            }
        }
        // transfer
        if ( f == 0 )
        { // copy markB into phase
            Aig_ManForEachObj( p->pAig, pObj, i )
                pObj->fPhase = pObj->fMarkB;
        }
        else
        { // refine classes
            RetValue1 = Ssw_ClassesRefineConst1( p->ppClasses, 0 );
            RetValue2 = Ssw_ClassesRefine( p->ppClasses, 0 );
        }
    }
    assert( iLits == Vec_IntSize(p->vInits) );
}

int Ssw_ManSetConstrPhases	(	Aig_Man_t *	p,
		int	nFrames,
		Vec_Int_t **	pvInits
	)

Function*************************************************************

Synopsis [Finds one satisfiable assignment of the timeframes.]

Description []

SideEffects []

SeeAlso []

Definition at line 100 of file sswConstr.c.

{
    Aig_Man_t * pFrames;
    sat_solver * pSat;
    Cnf_Dat_t * pCnf;
    Aig_Obj_t * pObj;
    int i, RetValue;
    if ( pvInits )
        *pvInits = NULL;
//    assert( p->nConstrs > 0 );
    // derive the timeframes
    pFrames = Ssw_FramesWithConstraints( p, nFrames );
    // create CNF
    pCnf = Cnf_Derive( pFrames, 0 );
    // create SAT solver
    pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 );
    if ( pSat == NULL )
    {
        Cnf_DataFree( pCnf );
        Aig_ManStop( pFrames );
        return 1;
    }
    // solve
    RetValue = sat_solver_solve( pSat, NULL, NULL,
        (ABC_INT64_T)1000000, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
    if ( RetValue == l_True && pvInits )
    {
        *pvInits = Vec_IntAlloc( 1000 );
        Aig_ManForEachCi( pFrames, pObj, i )
            Vec_IntPush( *pvInits, sat_solver_var_value(pSat, pCnf->pVarNums[Aig_ObjId(pObj)]) );

//        Aig_ManForEachCi( pFrames, pObj, i )
//            Abc_Print( 1, "%d", Vec_IntEntry(*pvInits, i) );
//        Abc_Print( 1, "\n" );
    }
    sat_solver_delete( pSat );
    Cnf_DataFree( pCnf );
    Aig_ManStop( pFrames );
    if ( RetValue == l_False )
        return 1;
    if ( RetValue == l_True )
        return 0;
    return -1;
}

int Ssw_ManSetConstrPhases_	(	Aig_Man_t *	p,
		int	nFrames,
		Vec_Int_t **	pvInits
	)

Function*************************************************************

Synopsis [Performs fraiging for one node.]

Description [Returns the fraiged node.]

SideEffects []

SeeAlso []

Definition at line 156 of file sswConstr.c.

{
    Vec_Int_t * vLits;
    sat_solver * pSat;
    Cnf_Dat_t * pCnf;
    Aig_Obj_t * pObj;
    int i, f, iVar, RetValue, nRegs;
    if ( pvInits )
        *pvInits = NULL;
    assert( p->nConstrs > 0 );
    // create CNF
    nRegs = p->nRegs; p->nRegs = 0;
    pCnf = Cnf_Derive( p, Aig_ManCoNum(p) );
    p->nRegs = nRegs;
    // create SAT solver
    pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, nFrames, 0 );
    assert( pSat->size == nFrames * pCnf->nVars );
    // collect constraint literals
    vLits = Vec_IntAlloc( 100 );
    Saig_ManForEachLo( p, pObj, i )
    {
        assert( pCnf->pVarNums[Aig_ObjId(pObj)] >= 0 );
        Vec_IntPush( vLits, toLitCond(pCnf->pVarNums[Aig_ObjId(pObj)], 1) );
    }
    for ( f = 0; f < nFrames; f++ )
    {
        Saig_ManForEachPo( p, pObj, i )
        {
            if ( i < Saig_ManPoNum(p) - Saig_ManConstrNum(p) )
                continue;
            assert( pCnf->pVarNums[Aig_ObjId(pObj)] >= 0 );
            iVar = pCnf->pVarNums[Aig_ObjId(pObj)] + pCnf->nVars*f;
            Vec_IntPush( vLits, toLitCond(iVar, 1) );
        }
    }
    RetValue = sat_solver_solve( pSat, (int *)Vec_IntArray(vLits),
        (int *)Vec_IntArray(vLits) + Vec_IntSize(vLits),
        (ABC_INT64_T)1000000, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
    if ( RetValue == l_True && pvInits )
    {
        *pvInits = Vec_IntAlloc( 1000 );
        for ( f = 0; f < nFrames; f++ )
        {
            Saig_ManForEachPi( p, pObj, i )
            {
                iVar = pCnf->pVarNums[Aig_ObjId(pObj)] + pCnf->nVars*f;
                Vec_IntPush( *pvInits, sat_solver_var_value(pSat, iVar) );
            }
        }
    }
    sat_solver_delete( pSat );
    Vec_IntFree( vLits );
    Cnf_DataFree( pCnf );
    if ( RetValue == l_False )
        return 1;
    if ( RetValue == l_True )
        return 0;
    return -1;
}

int Ssw_ManSweepBmcConstr

(

Ssw_Man_t *

p

)

Function*************************************************************

Synopsis [Performs fraiging for the internal nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 498 of file sswConstr.c.

{
    Aig_Obj_t * pObj, * pObjNew, * pObjLi, * pObjLo;
    int i, f, iLits;
    abctime clk;
clk = Abc_Clock();

    // start initialized timeframes
    p->pFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->pPars->nFramesK );
    Saig_ManForEachLo( p->pAig, pObj, i )
        Ssw_ObjSetFrame( p, pObj, 0, Aig_ManConst0(p->pFrames) );

    // build the constraint outputs
    iLits = 0;
    p->fRefined = 0;
    for ( f = 0; f < p->pPars->nFramesK; f++ )
    {
        // map constants and PIs
        Ssw_ObjSetFrame( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(p->pFrames) );
        Saig_ManForEachPi( p->pAig, pObj, i )
        {
            pObjNew = Aig_ObjCreateCi(p->pFrames);
            pObjNew->fPhase = Vec_IntEntry( p->vInits, iLits++ );
            Ssw_ObjSetFrame( p, pObj, f, pObjNew );
        }
        // build the constraint cones
        Saig_ManForEachPo( p->pAig, pObj, i )
        {
            if ( i < Saig_ManPoNum(p->pAig) - Saig_ManConstrNum(p->pAig) )
                continue;
            pObjNew = Ssw_ManSweepBmcConstr_rec( p, Aig_ObjFanin0(pObj), f );
            pObjNew = Aig_NotCond( pObjNew, Aig_ObjFaninC0(pObj) );
            if ( Aig_Regular(pObjNew) == Aig_ManConst1(p->pFrames) )
            {
                assert( Aig_IsComplement(pObjNew) );
                continue;
            }
            Ssw_NodesAreConstrained( p, pObjNew, Aig_ManConst0(p->pFrames) );
        }

        // sweep internal nodes
        Aig_ManForEachNode( p->pAig, pObj, i )
        {
            pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
            Ssw_ObjSetFrame( p, pObj, f, pObjNew );
            p->fRefined |= Ssw_ManSweepNodeConstr( p, pObj, f, 1 );
        }
        // quit if this is the last timeframe
        if ( f == p->pPars->nFramesK - 1 )
            break;
        // transfer latch input to the latch outputs
        Aig_ManForEachCo( p->pAig, pObj, i )
            Ssw_ObjSetFrame( p, pObj, f, Ssw_ObjChild0Fra(p, pObj, f) );
        // build logic cones for register outputs
        Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, i )
        {
            pObjNew = Ssw_ObjFrame( p, pObjLi, f );
            Ssw_ObjSetFrame( p, pObjLo, f+1, pObjNew );
            Ssw_CnfNodeAddToSolver( p->pMSat, Aig_Regular(pObjNew) );//
        }
    }
    assert( Vec_IntSize(p->vInits) == iLits + Saig_ManPiNum(p->pAig) );

    // cleanup
//    Ssw_ClassesCheck( p->ppClasses );
p->timeBmc += Abc_Clock() - clk;
    return p->fRefined;
}

int Ssw_ManSweepBmcConstr_old

(

Ssw_Man_t *

p

)

Function*************************************************************

Synopsis [Performs fraiging for the internal nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 407 of file sswConstr.c.

{
    Bar_Progress_t * pProgress = NULL;
    Aig_Obj_t * pObj, * pObjNew, * pObjLi, * pObjLo;
    int i, f, iLits;
    abctime clk;
clk = Abc_Clock();

    // start initialized timeframes
    p->pFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->pPars->nFramesK );
    Saig_ManForEachLo( p->pAig, pObj, i )
        Ssw_ObjSetFrame( p, pObj, 0, Aig_ManConst0(p->pFrames) );

    // build the constraint outputs
    iLits = 0;
    for ( f = 0; f < p->pPars->nFramesK; f++ )
    {
        // map constants and PIs
        Ssw_ObjSetFrame( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(p->pFrames) );
        Saig_ManForEachPi( p->pAig, pObj, i )
        {
            pObjNew = Aig_ObjCreateCi(p->pFrames);
            pObjNew->fPhase = Vec_IntEntry( p->vInits, iLits++ );
            Ssw_ObjSetFrame( p, pObj, f, pObjNew );
        }
        // build the constraint cones
        Saig_ManForEachPo( p->pAig, pObj, i )
        {
            if ( i < Saig_ManPoNum(p->pAig) - Saig_ManConstrNum(p->pAig) )
                continue;
            pObjNew = Ssw_ManSweepBmcConstr_rec( p, Aig_ObjFanin0(pObj), f );
            pObjNew = Aig_NotCond( pObjNew, Aig_ObjFaninC0(pObj) );
            if ( Aig_Regular(pObjNew) == Aig_ManConst1(p->pFrames) )
            {
                assert( Aig_IsComplement(pObjNew) );
                continue;
            }
            Ssw_NodesAreConstrained( p, pObjNew, Aig_ManConst0(p->pFrames) );
        }
    }
    assert( Vec_IntSize(p->vInits) == iLits + Saig_ManPiNum(p->pAig) );

    // sweep internal nodes
    p->fRefined = 0;
    if ( p->pPars->fVerbose )
        pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(p->pAig) * p->pPars->nFramesK );
    for ( f = 0; f < p->pPars->nFramesK; f++ )
    {
        // sweep internal nodes
        Aig_ManForEachNode( p->pAig, pObj, i )
        {
            if ( p->pPars->fVerbose )
                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_ObjSetFrame( p, pObj, f, pObjNew );
            p->fRefined |= Ssw_ManSweepNodeConstr( p, pObj, f, 1 );
        }
        // quit if this is the last timeframe
        if ( f == p->pPars->nFramesK - 1 )
            break;
        // transfer latch input to the latch outputs
        Aig_ManForEachCo( p->pAig, pObj, i )
            Ssw_ObjSetFrame( p, pObj, f, Ssw_ObjChild0Fra(p, pObj, f) );
        // build logic cones for register outputs
        Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, i )
        {
            pObjNew = Ssw_ObjFrame( p, pObjLi, f );
            Ssw_ObjSetFrame( p, pObjLo, f+1, pObjNew );
            Ssw_CnfNodeAddToSolver( p->pMSat, Aig_Regular(pObjNew) );//
        }
    }
    if ( p->pPars->fVerbose )
        Bar_ProgressStop( pProgress );

    // cleanup
//    Ssw_ClassesCheck( p->ppClasses );
p->timeBmc += Abc_Clock() - clk;
    return p->fRefined;
}

Aig_Obj_t* Ssw_ManSweepBmcConstr_rec	(	Ssw_Man_t *	p,
		Aig_Obj_t *	pObj,
		int	f
	)

Function*************************************************************

Synopsis [Performs fraiging for the internal nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 370 of file sswConstr.c.

{
    Aig_Obj_t * pObjNew, * pObjLi;
    pObjNew = Ssw_ObjFrame( p, pObj, f );
    if ( pObjNew )
        return pObjNew;
    assert( !Saig_ObjIsPi(p->pAig, pObj) );
    if ( Saig_ObjIsLo(p->pAig, pObj) )
    {
        assert( f > 0 );
        pObjLi  = Saig_ObjLoToLi( p->pAig, pObj );
        pObjNew = Ssw_ManSweepBmcConstr_rec( p, Aig_ObjFanin0(pObjLi), f-1 );
        pObjNew = Aig_NotCond( pObjNew, Aig_ObjFaninC0(pObjLi) );
    }
    else
    {
        assert( Aig_ObjIsNode(pObj) );
        Ssw_ManSweepBmcConstr_rec( p, Aig_ObjFanin0(pObj), f );
        Ssw_ManSweepBmcConstr_rec( p, Aig_ObjFanin1(pObj), f );
        pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
    }
    Ssw_ObjSetFrame( p, pObj, f, pObjNew );
    assert( pObjNew != NULL );
    return pObjNew;
}

int Ssw_ManSweepConstr

(

Ssw_Man_t *

p

)

Function*************************************************************

Synopsis [Performs fraiging for the internal nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 619 of file sswConstr.c.

{
    Bar_Progress_t * pProgress = NULL;
    Aig_Obj_t * pObj, * pObj2, * pObjNew;
    int nConstrPairs, i, f, iLits;
    abctime clk;
//Ssw_ManPrintPolarity( p->pAig );

    // perform speculative reduction
clk = Abc_Clock();
    // create timeframes
    p->pFrames = Ssw_FramesWithClasses( p );
    // add constants
    nConstrPairs = Aig_ManCoNum(p->pFrames)-Aig_ManRegNum(p->pAig);
    assert( (nConstrPairs & 1) == 0 );
    for ( i = 0; i < nConstrPairs; i += 2 )
    {
        pObj  = Aig_ManCo( p->pFrames, i   );
        pObj2 = Aig_ManCo( p->pFrames, i+1 );
        Ssw_NodesAreConstrained( p, Aig_ObjChild0(pObj), Aig_ObjChild0(pObj2) );
    }
    // build logic cones for register inputs
    for ( i = 0; i < Aig_ManRegNum(p->pAig); i++ )
    {
        pObj  = Aig_ManCo( p->pFrames, nConstrPairs + i );
        Ssw_CnfNodeAddToSolver( p->pMSat, Aig_ObjFanin0(pObj) );//
    }

    // map constants and PIs of the last frame
    f = p->pPars->nFramesK;
//    iLits = 0;
    iLits = f * Saig_ManPiNum(p->pAig);
    Ssw_ObjSetFrame( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(p->pFrames) );
    Saig_ManForEachPi( p->pAig, pObj, i )
    {
        pObjNew = Aig_ObjCreateCi(p->pFrames);
        pObjNew->fPhase = (p->vInits != NULL) && Vec_IntEntry(p->vInits, iLits++);
        Ssw_ObjSetFrame( p, pObj, f, pObjNew );
    }
    assert( Vec_IntSize(p->vInits) == iLits );
p->timeReduce += Abc_Clock() - clk;

    // add constraints to all timeframes
    for ( f = 0; f <= p->pPars->nFramesK; f++ )
    {
        Saig_ManForEachPo( p->pAig, pObj, i )
        {
            if ( i < Saig_ManPoNum(p->pAig) - Saig_ManConstrNum(p->pAig) )
                continue;
            Ssw_FramesWithClasses_rec( p, Aig_ObjFanin0(pObj), f );
//            if ( Aig_Regular(Ssw_ObjChild0Fra(p,pObj,f)) == Aig_ManConst1(p->pFrames) )
            if ( Ssw_ObjChild0Fra(p,pObj,f) == Aig_ManConst0(p->pFrames) )
                continue;
            assert( Ssw_ObjChild0Fra(p,pObj,f) != Aig_ManConst1(p->pFrames) );
            if ( Ssw_ObjChild0Fra(p,pObj,f) == Aig_ManConst1(p->pFrames) )
            {
                Abc_Print( 1, "Polarity violation.\n" );
                continue;
            }
            Ssw_NodesAreConstrained( p, Ssw_ObjChild0Fra(p,pObj,f), Aig_ManConst0(p->pFrames) );
        }
    }
    f = p->pPars->nFramesK;
    // clean the solver
    sat_solver_simplify( p->pMSat->pSat );


    // sweep internal nodes
    p->fRefined = 0;
    Ssw_ClassesClearRefined( p->ppClasses );
    if ( p->pPars->fVerbose )
        pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(p->pAig) );
    Aig_ManForEachObj( p->pAig, pObj, i )
    {
        if ( p->pPars->fVerbose )
            Bar_ProgressUpdate( pProgress, i, NULL );
        if ( Saig_ObjIsLo(p->pAig, pObj) )
            p->fRefined |= Ssw_ManSweepNodeConstr( p, pObj, f, 0 );
        else if ( Aig_ObjIsNode(pObj) )
        {
            pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
            Ssw_ObjSetFrame( p, pObj, f, pObjNew );
            p->fRefined |= Ssw_ManSweepNodeConstr( p, pObj, f, 0 );
        }
    }
    if ( p->pPars->fVerbose )
        Bar_ProgressStop( pProgress );
    // cleanup
//    Ssw_ClassesCheck( p->ppClasses );
    return p->fRefined;
}

int Ssw_ManSweepNodeConstr	(	Ssw_Man_t *	p,
		Aig_Obj_t *	pObj,
		int	f,
		int	fBmc
	)

Function*************************************************************

Synopsis [Performs fraiging for one node.]

Description [Returns the fraiged node.]

SideEffects []

SeeAlso []

Definition at line 314 of file sswConstr.c.

{
    Aig_Obj_t * pObjRepr, * pObjFraig, * pObjFraig2, * pObjReprFraig;
    int RetValue;
    // get representative of this class
    pObjRepr = Aig_ObjRepr( p->pAig, pObj );
    if ( pObjRepr == NULL )
        return 0;
    // get the fraiged node
    pObjFraig = Ssw_ObjFrame( p, pObj, f );
    // get the fraiged representative
    pObjReprFraig = Ssw_ObjFrame( p, pObjRepr, f );
    // check if constant 0 pattern distinquishes these nodes
    assert( pObjFraig != NULL && pObjReprFraig != NULL );
    assert( (pObj->fPhase == pObjRepr->fPhase) == (Aig_ObjPhaseReal(pObjFraig) == Aig_ObjPhaseReal(pObjReprFraig)) );
    // if the fraiged nodes are the same, return
    if ( Aig_Regular(pObjFraig) == Aig_Regular(pObjReprFraig) )
        return 0;
    // call equivalence checking
    if ( Aig_Regular(pObjFraig) != Aig_ManConst1(p->pFrames) )
        RetValue = Ssw_NodesAreEquiv( p, Aig_Regular(pObjReprFraig), Aig_Regular(pObjFraig) );
    else
        RetValue = Ssw_NodesAreEquiv( p, Aig_Regular(pObjFraig), Aig_Regular(pObjReprFraig) );
    if ( RetValue == 1 )  // proved equivalent
    {
        pObjFraig2 = Aig_NotCond( pObjReprFraig, pObj->fPhase ^ pObjRepr->fPhase );
        Ssw_ObjSetFrame( p, pObj, f, pObjFraig2 );
        return 0;
    }
    if ( RetValue == -1 ) // timed out
    {
        Ssw_ClassesRemoveNode( p->ppClasses, pObj );
        return 1;
    }
    // disproved equivalence
    Ssw_SmlSavePatternAig( p, f );
    Ssw_ManResimulateBit( p, pObj, pObjRepr );
    assert( Aig_ObjRepr( p->pAig, pObj ) != pObjRepr );
    if ( Aig_ObjRepr( p->pAig, pObj ) == pObjRepr )
    {
        Abc_Print( 1, "Ssw_ManSweepNodeConstr(): Failed to refine representative.\n" );
    }
    return 1;
}