src/opt/sim/simSwitch.c

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#include "abc.h"
#include "sim.h"


static void Sim_NodeSimulate( Abc_Obj_t * pNode, Vec_Ptr_t * vSimInfo, int nSimWords );
static float Sim_ComputeSwitching( unsigned * pSimInfo, int nSimWords );


Vec_Int_t * Sim_NtkComputeSwitching( Abc_Ntk_t * pNtk, int nPatterns )
{
    Vec_Int_t * vSwitching;
    float * pSwitching;
    Vec_Ptr_t * vNodes;
    Vec_Ptr_t * vSimInfo;
    Abc_Obj_t * pNode;
    unsigned * pSimInfo;
    int nSimWords, i;

    // allocate space for simulation info of all nodes
    nSimWords = SIM_NUM_WORDS(nPatterns);
    vSimInfo = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), nSimWords, 0 );
    // assign the random simulation to the CIs
    vSwitching = Vec_IntStart( Abc_NtkObjNumMax(pNtk) );
    pSwitching = (float *)vSwitching->pArray;
    Abc_NtkForEachCi( pNtk, pNode, i )
    {
        pSimInfo = Vec_PtrEntry(vSimInfo, pNode->Id);
        Sim_UtilSetRandom( pSimInfo, nSimWords );
        pSwitching[pNode->Id] = Sim_ComputeSwitching( pSimInfo, nSimWords );
    }
    // simulate the internal nodes
    vNodes  = Abc_AigDfs( pNtk, 1, 0 );
    Vec_PtrForEachEntry( vNodes, pNode, i )
    {
        pSimInfo = Vec_PtrEntry(vSimInfo, pNode->Id);
        Sim_UtilSimulateNodeOne( pNode, vSimInfo, nSimWords, 0 );
        pSwitching[pNode->Id] = Sim_ComputeSwitching( pSimInfo, nSimWords );
    }
    Vec_PtrFree( vNodes );
    Sim_UtilInfoFree( vSimInfo );
    return vSwitching;
}

float Sim_ComputeSwitching( unsigned * pSimInfo, int nSimWords )
{
    int nOnes, nTotal;
    nTotal = 32 * nSimWords;
    nOnes = Sim_UtilCountOnes( pSimInfo, nSimWords );
    return (float)2.0 * nOnes * (nTotal - nOnes) / nTotal / nTotal;
}

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