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/**CFile****************************************************************
FileName [ifMap.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [FPGA mapping based on priority cuts.]
Synopsis [Mapping procedures.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - November 21, 2006.]
Revision [$Id: ifMap.c,v 1.00 2006/11/21 00:00:00 alanmi Exp $]
***********************************************************************/
#include "if.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Counts the number of 1s in the signature.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int If_WordCountOnes( unsigned uWord )
{
uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
return (uWord & 0x0000FFFF) + (uWord>>16);
}
/**Function*************************************************************
Synopsis [Counts the number of 1s in the signature.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutDelaySpecial( If_Man_t * p, If_Cut_t * pCut, int fCarry )
{
static float Pin2Pin[2][3] = { {1.0, 1.0, 1.0}, {1.0, 1.0, 0.0} };
If_Obj_t * pLeaf;
float DelayCur, Delay = -IF_FLOAT_LARGE;
int i;
assert( pCut->nLeaves <= 3 );
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
DelayCur = If_ObjCutBest(pLeaf)->Delay;
Delay = IF_MAX( Delay, Pin2Pin[fCarry][i] + DelayCur );
}
return Delay;
}
/**Function*************************************************************
Synopsis [Finds the best cut for the given node.]
Description [Mapping modes: delay (0), area flow (1), area (2).]
SideEffects []
SeeAlso []
***********************************************************************/
void If_ObjPerformMappingAnd( If_Man_t * p, If_Obj_t * pObj, int Mode, int fPreprocess )
{
If_Set_t * pCutSet;
If_Cut_t * pCut0, * pCut1, * pCut;
int i, k;
// assert( p->pPars->fSeqMap || !If_ObjIsAnd(pObj->pFanin0) || pObj->pFanin0->pCutSet->nCuts > 1 );
// assert( p->pPars->fSeqMap || !If_ObjIsAnd(pObj->pFanin1) || pObj->pFanin1->pCutSet->nCuts > 1 );
assert( p->pPars->fSeqMap || !If_ObjIsAnd(pObj->pFanin0) || pObj->pFanin0->pCutSet->nCuts > 0 );
assert( p->pPars->fSeqMap || !If_ObjIsAnd(pObj->pFanin1) || pObj->pFanin1->pCutSet->nCuts > 0 );
// prepare
if ( !p->pPars->fSeqMap )
{
if ( Mode == 0 )
pObj->EstRefs = (float)pObj->nRefs;
else if ( Mode == 1 )
pObj->EstRefs = (float)((2.0 * pObj->EstRefs + pObj->nRefs) / 3.0);
}
/*
// process special cut
if ( p->pDriverCuts && p->pDriverCuts[pObj->Id] )
{
pCut = If_ObjCutBest(pObj);
if ( pCut->nLeaves == 0 )
{
pCut->nLeaves = Vec_IntSize( p->pDriverCuts[pObj->Id] );
Vec_IntForEachEntry( p->pDriverCuts[pObj->Id], k, i )
pCut->pLeaves[i] = k;
assert( pCut->pLeaves[0] <= pCut->pLeaves[1] );
// if ( pObj->nRefs > 0 )
// If_CutAreaRef( p, pCut );
}
pCut->Delay = If_CutDelaySpecial( p, pCut, pObj->fDriver );
pCut->Area = (Mode == 2)? 1 : If_CutAreaFlow( p, pCut );
if ( p->pPars->fEdge )
pCut->Edge = (Mode == 2)? 3 : If_CutEdgeFlow( p, pCut );
if ( p->pPars->fPower )
pCut->Power = (Mode == 2)? 0 : If_CutPowerFlow( p, pCut, pObj );
// prepare the cutset
pCutSet = If_ManSetupNodeCutSet( p, pObj );
// copy best cut
If_CutCopy( p, pCutSet->ppCuts[pCutSet->nCuts++], If_ObjCutBest(pObj) );
// add the trivial cut to the set
If_ManSetupCutTriv( p, pCutSet->ppCuts[pCutSet->nCuts++], pObj->Id );
// free the cuts
If_ManDerefNodeCutSet( p, pObj );
assert( pCutSet->nCuts == 2 );
return;
}
*/
// deref the selected cut
if ( Mode && pObj->nRefs > 0 )
If_CutAreaDeref( p, If_ObjCutBest(pObj) );
// prepare the cutset
pCutSet = If_ManSetupNodeCutSet( p, pObj );
// get the current assigned best cut
pCut = If_ObjCutBest(pObj);
if ( pCut->nLeaves > 0 )
{
// recompute the parameters of the best cut
/// if ( p->pPars->pLutStruct )
/// pCut->Delay = If_CutDelayLutStruct( p, pCut, p->pPars->pLutStruct, p->pPars->WireDelay );
if ( p->pPars->fUserRecLib )
pCut->Delay = If_CutDelayRecCost(p, pCut, pObj);
else if(p->pPars->fDelayOpt)
pCut->Delay = If_CutDelaySopCost(p,pCut);
else if(p->pPars->nGateSize > 0)
pCut->Delay = If_CutDelaySop(p,pCut);
else
pCut->Delay = If_CutDelay( p, pObj, pCut );
// assert( pCut->Delay <= pObj->Required + p->fEpsilon );
if ( pCut->Delay > pObj->Required + 2*p->fEpsilon )
Abc_Print( 1, "If_ObjPerformMappingAnd(): Warning! Delay of node %d (%f) exceeds the required times (%f).\n",
pObj->Id, pCut->Delay, pObj->Required + p->fEpsilon );
pCut->Area = (Mode == 2)? If_CutAreaDerefed( p, pCut ) : If_CutAreaFlow( p, pCut );
if ( p->pPars->fEdge )
pCut->Edge = (Mode == 2)? If_CutEdgeDerefed( p, pCut ) : If_CutEdgeFlow( p, pCut );
if ( p->pPars->fPower )
pCut->Power = (Mode == 2)? If_CutPowerDerefed( p, pCut, pObj ) : If_CutPowerFlow( p, pCut, pObj );
// save the best cut from the previous iteration
if ( !fPreprocess )
If_CutCopy( p, pCutSet->ppCuts[pCutSet->nCuts++], pCut );
}
// generate cuts
If_ObjForEachCut( pObj->pFanin0, pCut0, i )
If_ObjForEachCut( pObj->pFanin1, pCut1, k )
{
// get the next free cut
assert( pCutSet->nCuts <= pCutSet->nCutsMax );
pCut = pCutSet->ppCuts[pCutSet->nCuts];
// make sure K-feasible cut exists
if ( If_WordCountOnes(pCut0->uSign | pCut1->uSign) > p->pPars->nLutSize )
continue;
// merge the cuts
if ( !If_CutMerge( pCut0, pCut1, pCut ) )
continue;
if ( pObj->fSpec && pCut->nLeaves == (unsigned)p->pPars->nLutSize )
continue;
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
p->nCutsMerged++;
p->nCutsTotal++;
// check if this cut is contained in any of the available cuts
// if ( p->pPars->pFuncCost == NULL && If_CutFilter( p, pCut ) ) // do not filter functionality cuts
if ( !p->pPars->fSkipCutFilter && If_CutFilter( pCutSet, pCut ) )
continue;
// compute the truth table
pCut->fCompl = 0;
if ( p->pPars->fTruth )
{
// int clk = clock();
int RetValue = If_CutComputeTruth( p, pCut, pCut0, pCut1, pObj->fCompl0, pObj->fCompl1 );
// p->timeTruth += clock() - clk;
pCut->fUseless = 0;
if ( p->pPars->pFuncCell && RetValue < 2 )
{
assert( pCut->nLimit >= 4 && pCut->nLimit <= 16 );
pCut->fUseless = !p->pPars->pFuncCell( p, If_CutTruth(pCut), pCut->nLimit, pCut->nLeaves, p->pPars->pLutStruct );
p->nCutsUselessAll += pCut->fUseless;
p->nCutsUseless[pCut->nLeaves] += pCut->fUseless;
p->nCutsCountAll++;
p->nCutsCount[pCut->nLeaves]++;
}
}
// compute the application-specific cost and depth
pCut->fUser = (p->pPars->pFuncCost != NULL);
pCut->Cost = p->pPars->pFuncCost? p->pPars->pFuncCost(pCut) : 0;
if ( pCut->Cost == IF_COST_MAX )
continue;
// check if the cut satisfies the required times
/// if ( p->pPars->pLutStruct )
/// pCut->Delay = If_CutDelayLutStruct( p, pCut, p->pPars->pLutStruct, p->pPars->WireDelay );
if ( p->pPars->fUserRecLib )
pCut->Delay = If_CutDelayRecCost(p, pCut, pObj);
else if (p->pPars->fDelayOpt)
pCut->Delay = If_CutDelaySopCost(p, pCut);
else if(p->pPars->nGateSize > 0)
pCut->Delay = If_CutDelaySop(p,pCut);
else
pCut->Delay = If_CutDelay( p, pObj, pCut );
//if ( pCut->Cost == IF_COST_MAX )
// continue;
// Abc_Print( 1, "%.2f ", pCut->Delay );
if ( Mode && pCut->Delay > pObj->Required + p->fEpsilon )
continue;
// compute area of the cut (this area may depend on the application specific cost)
pCut->Area = (Mode == 2)? If_CutAreaDerefed( p, pCut ) : If_CutAreaFlow( p, pCut );
if ( p->pPars->fEdge )
pCut->Edge = (Mode == 2)? If_CutEdgeDerefed( p, pCut ) : If_CutEdgeFlow( p, pCut );
if ( p->pPars->fPower )
pCut->Power = (Mode == 2)? If_CutPowerDerefed( p, pCut, pObj ) : If_CutPowerFlow( p, pCut, pObj );
pCut->AveRefs = (Mode == 0)? (float)0.0 : If_CutAverageRefs( p, pCut );
// insert the cut into storage
If_CutSort( p, pCutSet, pCut );
}
assert( pCutSet->nCuts > 0 );
// add the trivial cut to the set
if ( !pObj->fSkipCut )
{
If_ManSetupCutTriv( p, pCutSet->ppCuts[pCutSet->nCuts++], pObj->Id );
assert( pCutSet->nCuts <= pCutSet->nCutsMax+1 );
}
// update the best cut
if ( !fPreprocess || pCutSet->ppCuts[0]->Delay <= pObj->Required + p->fEpsilon )
{
If_CutCopy( p, If_ObjCutBest(pObj), pCutSet->ppCuts[0] );
if(p->pPars->fUserRecLib)
assert(If_ObjCutBest(pObj)->Cost < IF_COST_MAX && If_ObjCutBest(pObj)->Delay < ABC_INFINITY);
}
assert( p->pPars->fSeqMap || If_ObjCutBest(pObj)->nLeaves > 1 );
// ref the selected cut
if ( Mode && pObj->nRefs > 0 )
If_CutAreaRef( p, If_ObjCutBest(pObj) );
if ( If_ObjCutBest(pObj)->fUseless )
Abc_Print( 1, "The best cut is useless.\n" );
// call the user specified function for each cut
if ( p->pPars->pFuncUser )
If_ObjForEachCut( pObj, pCut, i )
p->pPars->pFuncUser( p, pObj, pCut );
// free the cuts
If_ManDerefNodeCutSet( p, pObj );
}
/**Function*************************************************************
Synopsis [Finds the best cut for the choice node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ObjPerformMappingChoice( If_Man_t * p, If_Obj_t * pObj, int Mode, int fPreprocess )
{
If_Set_t * pCutSet;
If_Obj_t * pTemp;
If_Cut_t * pCutTemp, * pCut;
int i;
assert( pObj->pEquiv != NULL );
// prepare
if ( Mode && pObj->nRefs > 0 )
If_CutAreaDeref( p, If_ObjCutBest(pObj) );
// remove elementary cuts
for ( pTemp = pObj; pTemp; pTemp = pTemp->pEquiv )
pTemp->pCutSet->nCuts--;
// update the cutset of the node
pCutSet = pObj->pCutSet;
// generate cuts
for ( pTemp = pObj->pEquiv; pTemp; pTemp = pTemp->pEquiv )
{
assert( pTemp->nRefs == 0 );
// assert( p->pPars->fSeqMap || pTemp->pCutSet->nCuts > 0 ); // June 9, 2009
if ( pTemp->pCutSet->nCuts == 0 )
continue;
// go through the cuts of this node
If_ObjForEachCut( pTemp, pCutTemp, i )
{
assert( p->pPars->fSeqMap || pCutTemp->nLeaves > 1 );
// get the next free cut
assert( pCutSet->nCuts <= pCutSet->nCutsMax );
pCut = pCutSet->ppCuts[pCutSet->nCuts];
// copy the cut into storage
If_CutCopy( p, pCut, pCutTemp );
// check if this cut is contained in any of the available cuts
if ( If_CutFilter( pCutSet, pCut ) )
continue;
// check if the cut satisfies the required times
assert( pCut->Delay == If_CutDelay( p, pTemp, pCut ) );
if ( Mode && pCut->Delay > pObj->Required + p->fEpsilon )
continue;
// set the phase attribute
assert( pCut->fCompl == 0 );
pCut->fCompl ^= (pObj->fPhase ^ pTemp->fPhase); // why ^= ?
// compute area of the cut (this area may depend on the application specific cost)
pCut->Area = (Mode == 2)? If_CutAreaDerefed( p, pCut ) : If_CutAreaFlow( p, pCut );
if ( p->pPars->fEdge )
pCut->Edge = (Mode == 2)? If_CutEdgeDerefed( p, pCut ) : If_CutEdgeFlow( p, pCut );
if ( p->pPars->fPower )
pCut->Power = (Mode == 2)? If_CutPowerDerefed( p, pCut, pObj ) : If_CutPowerFlow( p, pCut, pObj );
pCut->AveRefs = (Mode == 0)? (float)0.0 : If_CutAverageRefs( p, pCut );
// insert the cut into storage
If_CutSort( p, pCutSet, pCut );
}
}
assert( pCutSet->nCuts > 0 );
// add the trivial cut to the set
if ( !pObj->fSkipCut )
{
If_ManSetupCutTriv( p, pCutSet->ppCuts[pCutSet->nCuts++], pObj->Id );
assert( pCutSet->nCuts <= pCutSet->nCutsMax+1 );
}
// update the best cut
if ( !fPreprocess || pCutSet->ppCuts[0]->Delay <= pObj->Required + p->fEpsilon )
If_CutCopy( p, If_ObjCutBest(pObj), pCutSet->ppCuts[0] );
assert( p->pPars->fSeqMap || If_ObjCutBest(pObj)->nLeaves > 1 );
// ref the selected cut
if ( Mode && pObj->nRefs > 0 )
If_CutAreaRef( p, If_ObjCutBest(pObj) );
// free the cuts
If_ManDerefChoiceCutSet( p, pObj );
}
/**Function*************************************************************
Synopsis [Performs one mapping pass over all nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_ManPerformMappingRound( If_Man_t * p, int nCutsUsed, int Mode, int fPreprocess, char * pLabel )
{
// ProgressBar * pProgress;
If_Obj_t * pObj;
int i, clk = clock();
float arrTime;
assert( Mode >= 0 && Mode <= 2 );
// set the sorting function
if ( Mode || p->pPars->fArea ) // area
p->SortMode = 1;
else if ( p->pPars->fFancy )
p->SortMode = 2;
else
p->SortMode = 0;
// set the cut number
p->nCutsUsed = nCutsUsed;
p->nCutsMerged = 0;
// make sure the visit counters are all zero
If_ManForEachNode( p, pObj, i )
assert( pObj->nVisits == pObj->nVisitsCopy );
// map the internal nodes
if ( p->pManTim != NULL )
{
Tim_ManIncrementTravId( p->pManTim );
If_ManForEachObj( p, pObj, i )
{
if ( If_ObjIsAnd(pObj) )
{
If_ObjPerformMappingAnd( p, pObj, Mode, fPreprocess );
if ( pObj->fRepr )
If_ObjPerformMappingChoice( p, pObj, Mode, fPreprocess );
}
else if ( If_ObjIsCi(pObj) )
{
//Abc_Print( 1, "processing CI %d\n", pObj->Id );
arrTime = Tim_ManGetCiArrival( p->pManTim, pObj->IdPio );
If_ObjSetArrTime( pObj, arrTime );
}
else if ( If_ObjIsCo(pObj) )
{
arrTime = If_ObjArrTime( If_ObjFanin0(pObj) );
Tim_ManSetCoArrival( p->pManTim, pObj->IdPio, arrTime );
}
else if ( If_ObjIsConst1(pObj) )
{
}
else
assert( 0 );
}
// Tim_ManPrint( p->pManTim );
}
else
{
// pProgress = Extra_ProgressBarStart( stdout, If_ManObjNum(p) );
If_ManForEachNode( p, pObj, i )
{
// Extra_ProgressBarUpdate( pProgress, i, pLabel );
If_ObjPerformMappingAnd( p, pObj, Mode, fPreprocess );
if ( pObj->fRepr )
If_ObjPerformMappingChoice( p, pObj, Mode, fPreprocess );
}
}
// Extra_ProgressBarStop( pProgress );
// make sure the visit counters are all zero
If_ManForEachNode( p, pObj, i )
assert( pObj->nVisits == 0 );
// compute required times and stats
If_ManComputeRequired( p );
// Tim_ManPrint( p->pManTim );
if ( p->pPars->fVerbose )
{
char Symb = fPreprocess? 'P' : ((Mode == 0)? 'D' : ((Mode == 1)? 'F' : 'A'));
Abc_Print( 1, "%c: Del = %7.2f. Ar = %9.1f. Edge = %8d. Switch = %7.2f. Cut = %8d. ",
Symb, p->RequiredGlo, p->AreaGlo, p->nNets, p->dPower, p->nCutsMerged );
Abc_PrintTime( 1, "T", clock() - clk );
// Abc_Print( 1, "Max number of cuts = %d. Average number of cuts = %5.2f.\n",
// p->nCutsMax, 1.0 * p->nCutsMerged / If_ManAndNum(p) );
}
return 1;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|