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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 [Mark nodes affected by sweep in the previous iteration.]
Description [Assumes that affected nodes are in p->ppClasses->vRefined.]
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_ManSweepMarkRefinement( Ssw_Man_t * p )
{
Vec_Ptr_t * vRefined, * vSupp;
Aig_Obj_t * pObj, * pObjLo, * pObjLi;
int i, k;
vRefined = Ssw_ClassesGetRefined( p->ppClasses );
if ( Vec_PtrSize(vRefined) == 0 )
{
Aig_ManForEachObj( p->pAig, pObj, i )
pObj->fMarkA = 1;
return;
}
// mark the nodes to be refined
Aig_ManCleanMarkA( p->pAig );
Vec_PtrForEachEntry( vRefined, pObj, i )
{
if ( Aig_ObjIsPi(pObj) )
{
pObj->fMarkA = 1;
continue;
}
assert( Aig_ObjIsNode(pObj) );
vSupp = Aig_Support( p->pAig, pObj );
Vec_PtrForEachEntry( vSupp, pObjLo, k )
pObjLo->fMarkA = 1;
Vec_PtrFree( vSupp );
}
// mark refinement
Aig_ManForEachNode( p->pAig, pObj, i )
pObj->fMarkA = Aig_ObjFanin0(pObj)->fMarkA | Aig_ObjFanin1(pObj)->fMarkA;
Saig_ManForEachLi( p->pAig, pObj, i )
pObj->fMarkA |= Aig_ObjFanin0(pObj)->fMarkA;
Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, i )
pObjLo->fMarkA |= pObjLi->fMarkA;
}
/**Function*************************************************************
Synopsis [Retrives value of the PI in the original AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ssw_ManGetSatVarValue( Ssw_Man_t * p, Aig_Obj_t * pObj, int f )
{
Aig_Obj_t * pObjFraig;
int nVarNum, Value;
// assert( Aig_ObjIsPi(pObj) );
pObjFraig = Ssw_ObjFrame( p, pObj, f );
nVarNum = Ssw_ObjSatNum( p, Aig_Regular(pObjFraig) );
assert( nVarNum > 0 );
if ( nVarNum == 0 )
printf( "Variable is not assigned.\n" );
Value = (!nVarNum)? 0 : (Aig_IsComplement(pObjFraig) ^ sat_solver_var_value( p->pSat, nVarNum ));
// Value = (Aig_IsComplement(pObjFraig) ^ ((!nVarNum)? 0 : sat_solver_var_value( p->pSat, nVarNum )));
// Value = (!nVarNum)? Aig_ManRandom(0) & 1 : (Aig_IsComplement(pObjFraig) ^ sat_solver_var_value( p->pSat, nVarNum ));
if ( p->pPars->fPolarFlip )
{
if ( Aig_Regular(pObjFraig)->fPhase ) Value ^= 1;
}
return Value;
}
/**Function*************************************************************
Synopsis [Copy pattern from the solver into the internal storage.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_SmlSavePatternAig( Ssw_Man_t * p, int f )
{
Aig_Obj_t * pObj;
int i;
memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
Aig_ManForEachPi( p->pAig, pObj, i )
if ( Ssw_ManGetSatVarValue( p, pObj, f ) )
Aig_InfoSetBit( p->pPatWords, i );
}
/**Function*************************************************************
Synopsis [Copy pattern from the solver into the internal storage.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_SmlSavePatternAig2( Ssw_Man_t * p, int f )
{
Aig_Obj_t * pObj;
int i;
memset( p->pPatWords2, 0, sizeof(unsigned) * p->nPatWords );
Aig_ManForEachPi( p->pAig, pObj, i )
if ( Ssw_ManGetSatVarValue( p, pObj, f ) )
Aig_InfoSetBit( p->pPatWords2, i );
}
/**Function*************************************************************
Synopsis [Copy pattern from the solver into the internal storage.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_SmlSavePatternAigPhase( Ssw_Man_t * p, int f )
{
Aig_Obj_t * pObj;
int i;
memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
Aig_ManForEachPi( p->pAig, pObj, i )
if ( Aig_ObjPhaseReal( Ssw_ObjFrame(p, pObj, f) ) )
Aig_InfoSetBit( p->pPatWords, i );
}
/**Function*************************************************************
Synopsis [Performs fraiging for one node.]
Description [Returns the fraiged node.]
SideEffects []
SeeAlso []
***********************************************************************/
int Ssw_ManSweepNode( Ssw_Man_t * p, Aig_Obj_t * pObj, int f, int fBmc )
{
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 );
if ( (pObj->fPhase == pObjRepr->fPhase) != (Aig_ObjPhaseReal(pObjFraig) == Aig_ObjPhaseReal(pObjReprFraig)) )
{
p->nStrangers++;
Ssw_SmlSavePatternAigPhase( p, f );
}
else
{
// if the fraiged nodes are the same, return
if ( Aig_Regular(pObjFraig) == Aig_Regular(pObjReprFraig) )
return 0;
// count the number of skipped calls
if ( !pObj->fMarkA && !pObjRepr->fMarkA )
p->nRefSkip++;
else
p->nRefUse++;
// call equivalence checking
if ( p->pPars->fSkipCheck && !fBmc && !pObj->fMarkA && !pObjRepr->fMarkA )
RetValue = 1;
else 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;
}
// check if skipping calls works correctly
if ( p->pPars->fSkipCheck && !fBmc && !pObj->fMarkA && !pObjRepr->fMarkA )
{
assert( 0 );
printf( "\nSsw_ManSweepNode(): Error!\n" );
}
// disproved the equivalence
Ssw_SmlSavePatternAig( p, f );
}
if ( !fBmc && p->pPars->fUniqueness && p->pPars->nFramesK > 1 &&
Ssw_ManUniqueOne( p, pObjRepr, pObj ) && p->iOutputLit == -1 )
{
if ( Ssw_ManUniqueAddConstraint( p, p->vCommon, 0, 1 ) )
{
int RetValue2 = Ssw_NodesAreEquiv( p, Aig_Regular(pObjReprFraig), Aig_Regular(pObjFraig) );
p->iOutputLit = -1;
{
int Flag = 0;
if ( Flag )
{
Aig_Obj_t * pFan0 = Aig_ObjFanin0(pObj);
Aig_Obj_t * pFan1 = Aig_ObjFanin1(pObj);
Aig_Obj_t * pFan00 = Aig_ObjFanin0(pFan0);
Aig_Obj_t * pFan01 = Aig_ObjFanin1(pFan0);
Aig_Obj_t * pFan10 = Aig_ObjFanin0(pFan1);
Aig_Obj_t * pFan11 = Aig_ObjFanin1(pFan1);
}
}
if ( RetValue2 == 0 )
{
int x = Ssw_ManUniqueOne( p, pObjRepr, pObj );
// Ssw_SmlSavePatternAig2( p, f );
// Ssw_ManResimulateWord2( p, pObj, pObjRepr, f );
Ssw_SmlSavePatternAig( p, f );
Ssw_ManResimulateWord( p, pObj, pObjRepr, f );
if ( Aig_ObjRepr( p->pAig, pObj ) == pObjRepr )
printf( "Ssw_ManSweepNode(): Refinement did not happen!!!!!!!!!!!!!!!!!!!!.\n" );
return 1;
}
return 0;
/*
int RetValue;
assert( p->iOutputLit > -1 );
RetValue = Ssw_ManSweepNode( p, pObj, f, 0 );
p->iOutputLit = -1;
return RetValue;
*/
}
}
if ( p->pPars->nConstrs == 0 )
Ssw_ManResimulateWord( p, pObj, pObjRepr, f );
else
Ssw_ManResimulateBit( p, pObj, pObjRepr );
assert( Aig_ObjRepr( p->pAig, pObj ) != pObjRepr );
if ( Aig_ObjRepr( p->pAig, pObj ) == pObjRepr )
printf( "Ssw_ManSweepNode(): Refinement did not happen.\n" );
return 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, * pObjLi, * pObjLo;
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_ObjSetFrame( p, pObj, 0, Aig_ManConst0(p->pFrames) );
// sweep internal nodes
p->fRefined = 0;
if ( p->pPars->fVerbose )
pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(p->pAig) * p->pPars->nFramesK );
Ssw_ManStartSolver( p );
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_ObjCreatePi(p->pFrames);
Ssw_ObjSetFrame( p, pObj, f, pObjNew );
Ssw_CnfNodeAddToSolver( p, Aig_Regular(pObjNew) );
}
// 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_ManSweepNode( 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
// build logic cones for register outputs
Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, i )
{
pObjNew = Ssw_ObjChild0Fra(p, pObjLi,f);
Ssw_ObjSetFrame( p, pObjLo, f+1, pObjNew );
Ssw_CnfNodeAddToSolver( p, Aig_Regular(pObjNew) );
}
}
if ( p->pPars->fVerbose )
Bar_ProgressStop( pProgress );
// cleanup
// Ssw_ClassesCheck( p->ppClasses );
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;
int v;
// perform speculative reduction
clk = clock();
// create timeframes
p->pFrames = Ssw_FramesWithClasses( p );
// add constraints
Ssw_ManStartSolver( p );
// nConstrPairs = Aig_ManPoNum(p->pFrames)-Aig_ManRegNum(p->pAig);
nConstrPairs = Aig_ManPoNum(p->pFrames)-p->nFrames*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_ObjChild0(pObj), Aig_ObjChild0(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) );
}
*/
p->timeReduce += clock() - clk;
// mark nodes that do not have to be refined
clk = clock();
if ( p->pPars->fSkipCheck )
Ssw_ManSweepMarkRefinement( p );
p->timeMarkCones += clock() - clk;
//Ssw_ManUnique( p );
// map constants and PIs of the last frame
f = p->pPars->nFramesK;
Ssw_ObjSetFrame( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(p->pFrames) );
Saig_ManForEachPi( p->pAig, pObj, i )
Ssw_ObjSetFrame( p, pObj, f, Aig_ObjCreatePi(p->pFrames) );
////
// bring up the previous frames
// if ( p->pPars->fUniqueness )
for ( v = 0; v <= f; v++ )
// Saig_ManForEachLo( p->pAig, pObj, i )
Aig_ManForEachPi( p->pAig, pObj, i )
{
/*
if ( i == 53 && v == 1 )
{
int x = 0;
}
*/
Ssw_CnfNodeAddToSolver( p, Aig_Regular(Ssw_ObjFrame(p, pObj, v)) );
}
////
sat_solver_simplify( p->pSat );
// make sure LOs are assigned
Saig_ManForEachLo( p->pAig, pObj, i )
assert( Ssw_ObjFrame( p, pObj, f ) != NULL );
// sweep internal nodes
p->fRefined = 0;
p->nSatFailsReal = 0;
p->nRefUse = p->nRefSkip = 0;
p->nUniques = 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_ManSweepNode( p, pObj, f, 0 );
else if ( Aig_ObjIsNode(pObj) )
{
pObj->fMarkA = Aig_ObjFanin0(pObj)->fMarkA | Aig_ObjFanin1(pObj)->fMarkA;
pObjNew = Aig_And( p->pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
Ssw_ObjSetFrame( p, pObj, f, pObjNew );
p->fRefined |= Ssw_ManSweepNode( p, pObj, f, 0 );
}
}
p->nSatFailsTotal += p->nSatFailsReal;
if ( p->pPars->fVerbose )
Bar_ProgressStop( pProgress );
// cleanup
// Ssw_ClassesCheck( p->ppClasses );
return p->fRefined;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
