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/**CFile****************************************************************
FileName [llbHint.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [BDD based reachability.]
Synopsis [Cofactors the circuit w.r.t. the high-fanout variables.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: llbHint.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "llbInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns CI index with the largest number of fanouts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Llb_ManMaxFanoutCi( Aig_Man_t * pAig )
{
Aig_Obj_t * pObj;
int i, WeightMax = -ABC_INFINITY, iInput = -1;
Aig_ManForEachPi( pAig, pObj, i )
if ( WeightMax < Aig_ObjRefs(pObj) )
{
WeightMax = Aig_ObjRefs(pObj);
iInput = i;
}
assert( iInput >= 0 );
return iInput;
}
/**Function*************************************************************
Synopsis [Derives AIG whose PI is substituted by a constant.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Llb_ManPerformHints( Aig_Man_t * pAig, int nHintDepth )
{
Aig_Man_t * pNew, * pTemp;
int i, iInput;
pNew = Aig_ManDupDfs( pAig );
for ( i = 0; i < nHintDepth; i++ )
{
iInput = Llb_ManMaxFanoutCi( pNew );
Abc_Print( 1, "%d %3d\n", i, iInput );
pNew = Aig_ManDupCof( pTemp = pNew, iInput, 1 );
Aig_ManStop( pTemp );
}
return pNew;
}
/**Function*************************************************************
Synopsis [Returns CI index with the largest number of fanouts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Llb_ManCollectHighFanoutObjects( Aig_Man_t * pAig, int nCandMax, int fCisOnly )
{
Vec_Int_t * vFanouts, * vResult;
Aig_Obj_t * pObj;
int i, fChanges, PivotValue;
// int Entry;
// collect fanout counts
vFanouts = Vec_IntAlloc( 100 );
Aig_ManForEachObj( pAig, pObj, i )
{
// if ( !Aig_ObjIsPi(pObj) && (fCisOnly || !Aig_ObjIsNode(pObj)) )
if ( !Saig_ObjIsLo(pAig,pObj) && (fCisOnly || !Aig_ObjIsNode(pObj)) )
continue;
Vec_IntPush( vFanouts, Aig_ObjRefs(pObj) );
}
Vec_IntSort( vFanouts, 1 );
// pick the separator
nCandMax = ABC_MIN( nCandMax, Vec_IntSize(vFanouts) - 1 );
PivotValue = Vec_IntEntry( vFanouts, nCandMax );
Vec_IntFree( vFanouts );
// collect obj satisfying the constraints
vResult = Vec_IntAlloc( 100 );
Aig_ManForEachObj( pAig, pObj, i )
{
// if ( !Aig_ObjIsPi(pObj) && (fCisOnly || !Aig_ObjIsNode(pObj)) )
if ( !Saig_ObjIsLo(pAig,pObj) && (fCisOnly || !Aig_ObjIsNode(pObj)) )
continue;
if ( Aig_ObjRefs(pObj) < PivotValue )
continue;
Vec_IntPush( vResult, Aig_ObjId(pObj) );
}
assert( Vec_IntSize(vResult) >= nCandMax );
// order in the decreasing order of fanouts
do
{
fChanges = 0;
for ( i = 0; i < Vec_IntSize(vResult) - 1; i++ )
if ( Aig_ObjRefs(Aig_ManObj(pAig, Vec_IntEntry(vResult, i))) <
Aig_ObjRefs(Aig_ManObj(pAig, Vec_IntEntry(vResult, i+1))) )
{
int Temp = Vec_IntEntry( vResult, i );
Vec_IntWriteEntry( vResult, i, Vec_IntEntry(vResult, i+1) );
Vec_IntWriteEntry( vResult, i+1, Temp );
fChanges = 1;
}
}
while ( fChanges );
/*
Vec_IntForEachEntry( vResult, Entry, i )
printf( "%d ", Aig_ObjRefs(Aig_ManObj(pAig, Entry)) );
printf( "\n" );
*/
return vResult;
}
/**Function*************************************************************
Synopsis [Derives AIG whose PI is substituted by a constant.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Llb_ManModelCheckAigWithHints( Aig_Man_t * pAigGlo, Gia_ParLlb_t * pPars )
{
DdManager * ddGlo = NULL;
Vec_Int_t * vHints;
Vec_Int_t * vHFCands;
int i, Entry, RetValue = -1;
int clk = clock();
assert( pPars->nHintDepth > 0 );
/*
// perform reachability without hints
RetValue = Llb_ManModelCheckAig( pAigGlo, pPars, NULL, NULL );
if ( RetValue >= 0 )
return RetValue;
*/
// create hints representation
vHFCands = Llb_ManCollectHighFanoutObjects( pAigGlo, pPars->nHintDepth+pPars->HintFirst, 1 );
vHints = Vec_IntStartFull( Aig_ManObjNumMax(pAigGlo) );
// add one hint at a time till the problem is solved
Vec_IntForEachEntryStart( vHFCands, Entry, i, pPars->HintFirst )
{
Vec_IntWriteEntry( vHints, Entry, 1 ); // change to 1 to start from zero cof!!!
// solve under hints
RetValue = Llb_ManModelCheckAig( pAigGlo, pPars, vHints, &ddGlo );
if ( RetValue == 0 )
goto Finish;
if ( RetValue == 1 )
break;
}
if ( RetValue == -1 )
goto Finish;
// undo the hints one at a time
for ( ; i >= pPars->HintFirst; i-- )
{
Entry = Vec_IntEntry( vHFCands, i );
Vec_IntWriteEntry( vHints, Entry, -1 );
// solve under relaxed hints
RetValue = Llb_ManModelCheckAig( pAigGlo, pPars, vHints, &ddGlo );
if ( RetValue == 0 )
goto Finish;
if ( RetValue == 1 )
continue;
break;
}
Finish:
if ( ddGlo )
{
if ( ddGlo->bReached )
Cudd_RecursiveDeref( ddGlo, ddGlo->bReached );
Extra_StopManager( ddGlo );
}
Vec_IntFreeP( &vHFCands );
Vec_IntFreeP( &vHints );
if ( pPars->fVerbose )
Abc_PrintTime( 1, "Total runtime", clock() - clk );
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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