src/base/abci/abcFpga.c

Go to the documentation of this file.

#include "abc.h"
#include "fpgaInt.h"


static Fpga_Man_t * Abc_NtkToFpga( Abc_Ntk_t * pNtk, int fRecovery, float * pSwitching, int fLatchPaths, int fVerbose );
static Abc_Ntk_t *  Abc_NtkFromFpga( Fpga_Man_t * pMan, Abc_Ntk_t * pNtk );
static Abc_Obj_t *  Abc_NodeFromFpga_rec( Abc_Ntk_t * pNtkNew, Fpga_Node_t * pNodeFpga );
 

Abc_Ntk_t * Abc_NtkFpga( Abc_Ntk_t * pNtk, float DelayTarget, int fRecovery, int fSwitching, int fLatchPaths, int fVerbose )
{
    int fShowSwitching = 1;
    Abc_Ntk_t * pNtkNew;
    Fpga_Man_t * pMan;
    Vec_Int_t * vSwitching;
    float * pSwitching = NULL;

    assert( Abc_NtkIsStrash(pNtk) );

    // print a warning about choice nodes
    if ( Abc_NtkGetChoiceNum( pNtk ) )
        printf( "Performing FPGA mapping with choices.\n" );

    // compute switching activity
    fShowSwitching |= fSwitching;
    if ( fShowSwitching )
    {
        extern Vec_Int_t * Sim_NtkComputeSwitching( Abc_Ntk_t * pNtk, int nPatterns );
        vSwitching = Sim_NtkComputeSwitching( pNtk, 4096 );
        pSwitching = (float *)vSwitching->pArray;
    }

    // perform FPGA mapping
    pMan = Abc_NtkToFpga( pNtk, fRecovery, pSwitching, fLatchPaths, fVerbose );    
    if ( pSwitching ) Vec_IntFree( vSwitching );
    if ( pMan == NULL )
        return NULL;
    Fpga_ManSetSwitching( pMan, fSwitching );
    Fpga_ManSetLatchPaths( pMan, fLatchPaths );
    Fpga_ManSetLatchNum( pMan, Abc_NtkLatchNum(pNtk) );
    Fpga_ManSetDelayTarget( pMan, DelayTarget );
    if ( !Fpga_Mapping( pMan ) )
    {
        Fpga_ManFree( pMan );
        return NULL;
    }

    // transform the result of mapping into a BDD network
    pNtkNew = Abc_NtkFromFpga( pMan, pNtk );
    if ( pNtkNew == NULL )
        return NULL;
    Fpga_ManFree( pMan );

    // make the network minimum base
    Abc_NtkMinimumBase( pNtkNew );

    if ( pNtk->pExdc )
        pNtkNew->pExdc = Abc_NtkDup( pNtk->pExdc );

    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkNew ) )
    {
        printf( "Abc_NtkFpga: The network check has failed.\n" );
        Abc_NtkDelete( pNtkNew );
        return NULL;
    }
    return pNtkNew;
}

Fpga_Man_t * Abc_NtkToFpga( Abc_Ntk_t * pNtk, int fRecovery, float * pSwitching, int fLatchPaths, int fVerbose )
{
    Fpga_Man_t * pMan;
    ProgressBar * pProgress;
    Fpga_Node_t * pNodeFpga;
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pNode, * pFanin, * pPrev;
    float * pfArrivals;
    int i;

    assert( Abc_NtkIsStrash(pNtk) );

    // start the mapping manager and set its parameters
    pMan = Fpga_ManCreate( Abc_NtkCiNum(pNtk), Abc_NtkCoNum(pNtk), fVerbose );
    if ( pMan == NULL )
        return NULL;
    Fpga_ManSetAreaRecovery( pMan, fRecovery );
    Fpga_ManSetOutputNames( pMan, Abc_NtkCollectCioNames(pNtk, 1) );
    pfArrivals = Abc_NtkGetCiArrivalFloats(pNtk);
    if ( fLatchPaths )
    {
        for ( i = 0; i < Abc_NtkPiNum(pNtk); i++ )
            pfArrivals[i] = -FPGA_FLOAT_LARGE;
    }
    Fpga_ManSetInputArrivals( pMan, pfArrivals );

    // create PIs and remember them in the old nodes
    Abc_NtkCleanCopy( pNtk );
    Abc_AigConst1(pNtk)->pCopy = (Abc_Obj_t *)Fpga_ManReadConst1(pMan);
    Abc_NtkForEachCi( pNtk, pNode, i )
    {
        pNodeFpga = Fpga_ManReadInputs(pMan)[i];
        pNode->pCopy = (Abc_Obj_t *)pNodeFpga;
        if ( pSwitching )
            Fpga_NodeSetSwitching( pNodeFpga, pSwitching[pNode->Id] );
    }

    // load the AIG into the mapper
    vNodes = Abc_AigDfs( pNtk, 0, 0 );
    pProgress = Extra_ProgressBarStart( stdout, vNodes->nSize );
    Vec_PtrForEachEntry( vNodes, pNode, i )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        // add the node to the mapper
        pNodeFpga = Fpga_NodeAnd( pMan, 
            Fpga_NotCond( Abc_ObjFanin0(pNode)->pCopy, Abc_ObjFaninC0(pNode) ),
            Fpga_NotCond( Abc_ObjFanin1(pNode)->pCopy, Abc_ObjFaninC1(pNode) ) );
        assert( pNode->pCopy == NULL );
        // remember the node
        pNode->pCopy = (Abc_Obj_t *)pNodeFpga;
        if ( pSwitching )
            Fpga_NodeSetSwitching( pNodeFpga, pSwitching[pNode->Id] );
        // set up the choice node
        if ( Abc_AigNodeIsChoice( pNode ) )
            for ( pPrev = pNode, pFanin = pNode->pData; pFanin; pPrev = pFanin, pFanin = pFanin->pData )
            {
                Fpga_NodeSetNextE( (Fpga_Node_t *)pPrev->pCopy, (Fpga_Node_t *)pFanin->pCopy );
                Fpga_NodeSetRepr( (Fpga_Node_t *)pFanin->pCopy, (Fpga_Node_t *)pNode->pCopy );
            }
    }
    Extra_ProgressBarStop( pProgress );
    Vec_PtrFree( vNodes );

    // set the primary outputs without copying the phase
    Abc_NtkForEachCo( pNtk, pNode, i )
        Fpga_ManReadOutputs(pMan)[i] = (Fpga_Node_t *)Abc_ObjFanin0(pNode)->pCopy;
    return pMan;
}

Abc_Ntk_t * Abc_NtkFromFpga( Fpga_Man_t * pMan, Abc_Ntk_t * pNtk )
{
    ProgressBar * pProgress;
    Abc_Ntk_t * pNtkNew;
    Abc_Obj_t * pNode, * pNodeNew;
    int i, nDupGates;
    // create the new network
    pNtkNew = Abc_NtkStartFrom( pNtk, ABC_NTK_LOGIC, ABC_FUNC_BDD );
    // make the mapper point to the new network
    Fpga_CutsCleanSign( pMan );
    Fpga_ManCleanData0( pMan );
    Abc_NtkForEachCi( pNtk, pNode, i )
        Fpga_NodeSetData0( Fpga_ManReadInputs(pMan)[i], (char *)pNode->pCopy );
    // set the constant node
//    if ( Fpga_NodeReadRefs(Fpga_ManReadConst1(pMan)) > 0 )
        Fpga_NodeSetData0( Fpga_ManReadConst1(pMan), (char *)Abc_NtkCreateNodeConst1(pNtkNew) );
    // process the nodes in topological order
    pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) );
    Abc_NtkForEachCo( pNtk, pNode, i )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        pNodeNew = Abc_NodeFromFpga_rec( pNtkNew, Fpga_ManReadOutputs(pMan)[i] );
        assert( !Abc_ObjIsComplement(pNodeNew) );
        Abc_ObjFanin0(pNode)->pCopy = pNodeNew;
    }
    Extra_ProgressBarStop( pProgress );
    // finalize the new network
    Abc_NtkFinalize( pNtk, pNtkNew );
    // remove the constant node if not used
    pNodeNew = (Abc_Obj_t *)Fpga_NodeReadData0(Fpga_ManReadConst1(pMan));
    if ( Abc_ObjFanoutNum(pNodeNew) == 0 )
        Abc_NtkDeleteObj( pNodeNew );
    // decouple the PO driver nodes to reduce the number of levels
    nDupGates = Abc_NtkLogicMakeSimpleCos( pNtkNew, 1 );
//    if ( nDupGates && Fpga_ManReadVerbose(pMan) )
//        printf( "Duplicated %d gates to decouple the CO drivers.\n", nDupGates );
    return pNtkNew;
}

Abc_Obj_t * Abc_NodeFromFpga_rec( Abc_Ntk_t * pNtkNew, Fpga_Node_t * pNodeFpga )
{
    Fpga_Cut_t * pCutBest;
    Fpga_Node_t ** ppLeaves; 
    Abc_Obj_t * pNodeNew;
    int i, nLeaves;
    assert( !Fpga_IsComplement(pNodeFpga) );
    // return if the result if known
    pNodeNew = (Abc_Obj_t *)Fpga_NodeReadData0( pNodeFpga );
    if ( pNodeNew )
        return pNodeNew;
    assert( Fpga_NodeIsAnd(pNodeFpga) );
    // get the parameters of the best cut
    pCutBest = Fpga_NodeReadCutBest( pNodeFpga );
    ppLeaves = Fpga_CutReadLeaves( pCutBest );
    nLeaves  = Fpga_CutReadLeavesNum( pCutBest ); 
    // create a new node 
    pNodeNew = Abc_NtkCreateNode( pNtkNew );
    for ( i = 0; i < nLeaves; i++ )
        Abc_ObjAddFanin( pNodeNew, Abc_NodeFromFpga_rec(pNtkNew, ppLeaves[i]) );
    // derive the function of this node
    pNodeNew->pData = Fpga_TruthsCutBdd( pNtkNew->pManFunc, pCutBest );   Cudd_Ref( pNodeNew->pData );
    Fpga_NodeSetData0( pNodeFpga, (char *)pNodeNew );
    return pNodeNew;
}

---