/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Dar_ManRewrite( Aig_Man_t * pAig, Dar_RwrPar_t * pPars )
{
Dar_Man_t * p;
ProgressBar * pProgress;
Dar_Cut_t * pCut;
Aig_Obj_t * pObj, * pObjNew;
int i, k, nNodesOld, nNodeBefore, nNodeAfter, Required;
int clk = 0, clkStart;
// prepare the library
Dar_LibPrepare( pPars->nSubgMax );
// create rewriting manager
p = Dar_ManStart( pAig, pPars );
// remove dangling nodes
Aig_ManCleanup( pAig );
// if updating levels is requested, start fanout and timing
if ( p->pPars->fFanout )
Aig_ManFanoutStart( pAig );
if ( p->pPars->fUpdateLevel )
Aig_ManStartReverseLevels( pAig, 0 );
// set elementary cuts for the PIs
Dar_ManCutsStart( p );
// resynthesize each node once
clkStart = clock();
p->nNodesInit = Aig_ManNodeNum(pAig);
nNodesOld = Vec_PtrSize( pAig->vObjs );
pProgress = Extra_ProgressBarStart( stdout, nNodesOld );
Aig_ManForEachObj( pAig, pObj, i )
// pProgress = Extra_ProgressBarStart( stdout, 100 );
// Aig_ManOrderStart( pAig );
// Aig_ManForEachNodeInOrder( pAig, pObj )
{
// Extra_ProgressBarUpdate( pProgress, 100*pAig->nAndPrev/pAig->nAndTotal, NULL );
Extra_ProgressBarUpdate( pProgress, i, NULL );
if ( !Aig_ObjIsNode(pObj) )
continue;
if ( i > nNodesOld )
break;
// consider freeing the cuts
// if ( (i & 0xFFF) == 0 && Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20) > 100 )
// Dar_ManCutsStart( p );
// compute cuts for the node
p->nNodesTried++;
clk = clock();
Dar_ObjComputeCuts_rec( p, pObj );
p->timeCuts += clock() - clk;
// check if there is a trivial cut
Dar_ObjForEachCut( pObj, pCut, k )
if ( pCut->nLeaves == 0 || (pCut->nLeaves == 1 && pCut->pLeaves[0] != pObj->Id && Aig_ManObj(p->pAig, pCut->pLeaves[0])) )
break;
if ( k < (int)pObj->nCuts )
{
assert( pCut->nLeaves < 2 );
if ( pCut->nLeaves == 0 ) // replace by constant
{
assert( pCut->uTruth == 0 || pCut->uTruth == 0xFFFF );
pObjNew = Aig_NotCond( Aig_ManConst1(p->pAig), pCut->uTruth==0 );
}
else
{
assert( pCut->uTruth == 0xAAAA || pCut->uTruth == 0x5555 );
pObjNew = Aig_NotCond( Aig_ManObj(p->pAig, pCut->pLeaves[0]), pCut->uTruth==0x5555 );
}
// remove the old cuts
Dar_ObjSetCuts( pObj, NULL );
// replace the node
Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
continue;
}
// evaluate the cuts
p->GainBest = -1;
Required = pAig->vLevelR? Aig_ObjRequiredLevel(pAig, pObj) : AIG_INFINITY;
Dar_ObjForEachCut( pObj, pCut, k )
Dar_LibEval( p, pObj, pCut, Required );
// check the best gain
if ( !(p->GainBest > 0 || (p->GainBest == 0 && p->pPars->fUseZeros)) )
{
// Aig_ObjOrderAdvance( pAig );
continue;
}
// remove the old cuts
Dar_ObjSetCuts( pObj, NULL );
// if we end up here, a rewriting step is accepted
nNodeBefore = Aig_ManNodeNum( pAig );
pObjNew = Dar_LibBuildBest( p ); // pObjNew can be complemented!
pObjNew = Aig_NotCond( pObjNew, Aig_ObjPhaseReal(pObjNew) ^ pObj->fPhase );
assert( (int)Aig_Regular(pObjNew)->Level <= Required );
// replace the node
Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
// compare the gains
nNodeAfter = Aig_ManNodeNum( pAig );
assert( p->GainBest <= nNodeBefore - nNodeAfter );
// count gains of this class
p->ClassGains[p->ClassBest] += nNodeBefore - nNodeAfter;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Dar_ManRewrite( Aig_Man_t * pAig, Dar_RwrPar_t * pPars )
{
extern Vec_Int_t * Saig_ManComputeSwitchProbs( Aig_Man_t * p, int nFrames, int nPref, int fProbOne );
Dar_Man_t * p;
// Bar_Progress_t * pProgress;
Dar_Cut_t * pCut;
Aig_Obj_t * pObj, * pObjNew;
int i, k, nNodesOld, nNodeBefore, nNodeAfter, Required;
abctime clk = 0, clkStart;
int Counter = 0;
int nMffcSize;//, nMffcGains[MAX_VAL+1][MAX_VAL+1] = {{0}};
// prepare the library
Dar_LibPrepare( pPars->nSubgMax );
// create rewriting manager
p = Dar_ManStart( pAig, pPars );
if ( pPars->fPower )
pAig->vProbs = Saig_ManComputeSwitchProbs( pAig, 48, 16, 1 );
// remove dangling nodes
Aig_ManCleanup( pAig );
// if updating levels is requested, start fanout and timing
if ( p->pPars->fFanout )
Aig_ManFanoutStart( pAig );
if ( p->pPars->fUpdateLevel )
Aig_ManStartReverseLevels( pAig, 0 );
// set elementary cuts for the PIs
// Dar_ManCutsStart( p );
// resynthesize each node once
clkStart = Abc_Clock();
p->nNodesInit = Aig_ManNodeNum(pAig);
nNodesOld = Vec_PtrSize( pAig->vObjs );
// pProgress = Bar_ProgressStart( stdout, nNodesOld );
Aig_ManForEachObj( pAig, pObj, i )
// pProgress = Bar_ProgressStart( stdout, 100 );
// Aig_ManOrderStart( pAig );
// Aig_ManForEachNodeInOrder( pAig, pObj )
{
if ( pAig->Time2Quit && !(i & 256) && Abc_Clock() > pAig->Time2Quit )
break;
// Bar_ProgressUpdate( pProgress, 100*pAig->nAndPrev/pAig->nAndTotal, NULL );
// Bar_ProgressUpdate( pProgress, i, NULL );
if ( !Aig_ObjIsNode(pObj) )
continue;
if ( i > nNodesOld )
// if ( p->pPars->fUseZeros && i > nNodesOld )
break;
if ( pPars->fRecycle && ++Counter % 50000 == 0 && Aig_DagSize(pObj) < Vec_PtrSize(p->vCutNodes)/100 )
{
// printf( "Counter = %7d. Node = %7d. Dag = %5d. Vec = %5d.\n",
// Counter, i, Aig_DagSize(pObj), Vec_PtrSize(p->vCutNodes) );
// fflush( stdout );
Dar_ManCutsRestart( p, pObj );
}
// consider freeing the cuts
// if ( (i & 0xFFF) == 0 && Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20) > 100 )
// Dar_ManCutsStart( p );
// compute cuts for the node
p->nNodesTried++;
clk = Abc_Clock();
Dar_ObjSetCuts( pObj, NULL );
Dar_ObjComputeCuts_rec( p, pObj );
p->timeCuts += Abc_Clock() - clk;
// check if there is a trivial cut
Dar_ObjForEachCut( pObj, pCut, k )
if ( pCut->nLeaves == 0 || (pCut->nLeaves == 1 && pCut->pLeaves[0] != pObj->Id && Aig_ManObj(p->pAig, pCut->pLeaves[0])) )
break;
if ( k < (int)pObj->nCuts )
{
assert( pCut->nLeaves < 2 );
if ( pCut->nLeaves == 0 ) // replace by constant
{
assert( pCut->uTruth == 0 || pCut->uTruth == 0xFFFF );
pObjNew = Aig_NotCond( Aig_ManConst1(p->pAig), pCut->uTruth==0 );
}
else
{
assert( pCut->uTruth == 0xAAAA || pCut->uTruth == 0x5555 );
pObjNew = Aig_NotCond( Aig_ManObj(p->pAig, pCut->pLeaves[0]), pCut->uTruth==0x5555 );
}
// remove the old cuts
Dar_ObjSetCuts( pObj, NULL );
// replace the node
Aig_ObjReplace( pAig, pObj, pObjNew, p->pPars->fUpdateLevel );
continue;
}
// evaluate the cuts
p->GainBest = -1;
nMffcSize = -1;
Required = pAig->vLevelR? Aig_ObjRequiredLevel(pAig, pObj) : ABC_INFINITY;
Dar_ObjForEachCut( pObj, pCut, k )
{
int nLeavesOld = pCut->nLeaves;
if ( pCut->nLeaves == 3 )
pCut->pLeaves[pCut->nLeaves++] = 0;
Dar_LibEval( p, pObj, pCut, Required, &nMffcSize );
pCut->nLeaves = nLeavesOld;
}
// check the best gain
if ( !(p->GainBest > 0 || (p->GainBest == 0 && p->pPars->fUseZeros)) )
{
// Aig_ObjOrderAdvance( pAig );
continue;
}
// nMffcGains[p->GainBest < MAX_VAL ? p->GainBest : MAX_VAL][nMffcSize < MAX_VAL ? nMffcSize : MAX_VAL]++;
// remove the old cuts
Dar_ObjSetCuts( pObj, NULL );
// if we end up here, a rewriting step is accepted
nNodeBefore = Aig_ManNodeNum( pAig );
pObjNew = Dar_LibBuildBest( p ); // pObjNew can be complemented!
pObjNew = Aig_NotCond( pObjNew, Aig_ObjPhaseReal(pObjNew) ^ pObj->fPhase );
assert( (int)Aig_Regular(pObjNew)->Level <= Required );
// replace the node
Aig_ObjReplace( pAig, pObj, pObjNew, p->pPars->fUpdateLevel );
// compare the gains
nNodeAfter = Aig_ManNodeNum( pAig );
assert( p->GainBest <= nNodeBefore - nNodeAfter );
// count gains of this class
p->ClassGains[p->ClassBest] += nNodeBefore - nNodeAfter;
}
/**Function*************************************************************
Synopsis [Performs AIG shrinking using the current mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Gia_ManMapShrink4( Gia_Man_t * p, int fKeepLevel, int fVerbose )
{
Vec_Int_t * vLeaves, * vTruth, * vVisited, * vLeavesBest;
Gia_Man_t * pNew, * pTemp;
Gia_Obj_t * pObj, * pFanin;
unsigned * pTruth;
int i, k, iFan;
abctime clk = Abc_Clock();
// int ClassCounts[222] = {0};
int * pLutClass, Counter = 0;
assert( p->pMapping != NULL );
if ( Gia_ManLutSizeMax( p ) > 4 )
{
printf( "Resynthesis is not performed when nodes have more than 4 inputs.\n" );
return NULL;
}
pLutClass = ABC_CALLOC( int, Gia_ManObjNum(p) );
vLeaves = Vec_IntAlloc( 0 );
vTruth = Vec_IntAlloc( (1<<16) );
vVisited = Vec_IntAlloc( 0 );
vLeavesBest = Vec_IntAlloc( 4 );
// prepare the library
Dar_LibPrepare( 5 );
// clean the old manager
Gia_ManCleanTruth( p );
Gia_ManSetPhase( p );
Gia_ManFillValue( p );
Gia_ManConst0(p)->Value = 0;
// start the new manager
pNew = Gia_ManStart( Gia_ManObjNum(p) );
pNew->pName = Abc_UtilStrsav( p->pName );
pNew->pSpec = Abc_UtilStrsav( p->pSpec );
Gia_ManHashAlloc( pNew );
Gia_ManCleanLevels( pNew, Gia_ManObjNum(p) );
Gia_ManForEachObj1( p, pObj, i )
{
if ( Gia_ObjIsCi(pObj) )
{
pObj->Value = Gia_ManAppendCi( pNew );
if ( p->vLevels )
Gia_ObjSetLevel( pNew, Gia_ObjFromLit(pNew, Gia_ObjValue(pObj)), Gia_ObjLevel(p, pObj) );
}
else if ( Gia_ObjIsCo(pObj) )
{
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
}
else if ( Gia_ObjIsLut(p, i) )
{
Counter++;
// collect leaves of this gate
Vec_IntClear( vLeaves );
Gia_LutForEachFanin( p, i, iFan, k )
Vec_IntPush( vLeaves, iFan );
for ( ; k < 4; k++ )
Vec_IntPush( vLeaves, 0 );
//.compute the truth table
pTruth = Gia_ManConvertAigToTruth( p, pObj, vLeaves, vTruth, vVisited );
// change from node IDs to their literals
Gia_ManForEachObjVec( vLeaves, p, pFanin, k )
{
assert( Gia_ObjValue(pFanin) != ~0 );
Vec_IntWriteEntry( vLeaves, k, Gia_ObjValue(pFanin) );
}
// derive new structre
if ( Gia_ManTruthIsConst0(pTruth, Vec_IntSize(vLeaves)) )
pObj->Value = 0;
else if ( Gia_ManTruthIsConst1(pTruth, Vec_IntSize(vLeaves)) )
pObj->Value = 1;
else
{
pObj->Value = Dar_LibEvalBuild( pNew, vLeaves, 0xffff & *pTruth, fKeepLevel, vLeavesBest );
pObj->Value = Abc_LitNotCond( pObj->Value, Gia_ObjPhaseRealLit(pNew, pObj->Value) ^ pObj->fPhase );
}
}
}