StrictMatchRFEstimator.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file StrictMatchRFEstimator.cc
 *
 * Declaration of StrictMatchRFEstimator. A RF estimation plugin that 
 * estimates data only by fetching prestored cost data of the units.
 * It does not perform any kind of linearization etc. to try to estimate
 * a RF that has not direct cost data in HDB.
 *
 * @author Pekka Jääskeläinen 2005 (pjaaskel-no.spam-cs.tut.fi)
 * @note rating: red
 */
#include "RFCostEstimationPlugin.hh"
#include "Application.hh"
#include "DataObject.hh"
#include "Exception.hh"
#include "HDBManager.hh"
#include "BaseRegisterFile.hh"
#include "ExecutionTrace.hh"
#include "Conversion.hh"
 
using namespace CostEstimator;
 
class StrictMatchRFEstimator : public RFCostEstimationPlugin {
public:
    StrictMatchRFEstimator(const std::string& name) :
        RFCostEstimationPlugin(name) {
    }
 
    virtual ~StrictMatchRFEstimator() {
    }
 
    DESCRIPTION(
        "Simple RF cost estimator plugin that estimates costs of RFs "
        "simply by looking up direct matches from HDB. In case there's "
        "no cost data available for the given RF, it's unable to estimate "
        "it by using linearization etc.");
 
public:
 
    /**
     * Estimates the register file's area by fetching cost data named 'area'
     * from HDB.
     */  
    bool estimateArea(
        const TTAMachine::BaseRegisterFile& /*rf*/,
        const IDF::RFImplementationLocation& implementation,
        AreaInGates& area,
        HDB::HDBManager& hdb) {
 
//#define DEBUG_AREA_ESTIMATION
 
        try { 
            // simply fetch the area data of the FU, if any
            DataObject areaFromDB = hdb.rfCostEstimationData(
                "area", implementation.id(), name_);       
            area = areaFromDB.doubleValue();
#ifdef DEBUG_AREA_ESTIMATION
            Application::logStream() 
                << rf.name() << " area " << area << std::endl;
#endif
            return true;
        } catch (const KeyNotFound&) {
            // if no area data found, don't even try to estimate the area
            // somehow
            Application::logStream() << "No area data found in HDB.";
 
            return false;
        } catch (const Exception& e) {
            // for example, if doubleValue() conversion failed, then it's
            // a problem with HDB contents 
            debugLog(e.errorMessage());
            return false;
        }
        return false;
    }    
 
    /**
     * Estimates the register file port write delay by fetching cost data 
     * named 'input_delay' from HDB.
     *
     * Assumes that all ports have the same input delay, that is, there is
     * only one 'input_delay' entry for a RF in HDB.
     */
    bool
    estimatePortWriteDelay(
        const TTAMachine::RFPort& /*port*/,
        const IDF::RFImplementationLocation& implementation,
        DelayInNanoSeconds& delay,
        HDB::HDBManager& hdb) {
 
//#define DEBUG_DELAY_ESTIMATION
        try { 
            // simply fetch the delay data of the RF port, if any
            DataObject delayFromDB = hdb.rfCostEstimationData(
                "input_delay", implementation.id(), name_);       
            delay = delayFromDB.doubleValue();
#ifdef DEBUG_DELAY_ESTIMATION
            Application::logStream() 
                << port.name() << " write delay " << delay << std::endl;
#endif
            return true;
        } catch (const KeyNotFound&) {
            // if no data found, don't even try to estimate the area
            Application::logStream()
                << "No input_delay cost data found for RF " 
                << implementation.id() << ", plugin " << name_ << std::endl;
            return false;
        } catch (const Exception& e) {
            // for example, if doubleValue() conversion failed, then it's
            // a problem with HDB contents 
            debugLog(e.errorMessage());
            return false;
        }
 
        return false;
    }
 
    /**
     * Estimates the register file port read delay by fetching cost data 
     * named 'output_delay' from HDB.
     *
     * Assumes that all ports have the same output delay, that is, there is
     * only one 'output_delay' entry for a RF in HDB.
     */
    bool
    estimatePortReadDelay(
        const TTAMachine::RFPort& /*port*/,
        const IDF::RFImplementationLocation& implementation,
        DelayInNanoSeconds& delay,
        HDB::HDBManager& hdb) {
 
        try { 
            // simply fetch the delay data of the RF port, if any
            DataObject delayFromDB = hdb.rfCostEstimationData(
                "output_delay", implementation.id(), name_);       
            delay = delayFromDB.doubleValue();
#ifdef DEBUG_DELAY_ESTIMATION
            Application::logStream() 
                << port.name() << " read delay " << delay << std::endl;
#endif
            return true;
        } catch (const KeyNotFound&) {
            // if no data found, don't even try to estimate the area
            Application::logStream()
                << "No output_delay cost data found for RF " 
                << implementation.id() << ", plugin " << name_ << std::endl;
            return false;
        } catch (const Exception& e) {
            // for example, if doubleValue() conversion failed, then it's
            // a problem with HDB contents 
            debugLog(e.errorMessage());
            return false;
        }
 
        return false;
    }
 
    /**
     * Estimates the register file maximum computation delay by fetching 
     * cost data named 'computation_delay' from HDB.
     */
    bool
    estimateMaximumComputationDelay(
        const TTAMachine::BaseRegisterFile& /*rf*/,
        const IDF::RFImplementationLocation& implementation,
        DelayInNanoSeconds& delay,
        HDB::HDBManager& hdb) {
 
        try { 
            // simply fetch the delay data of the RF, if any
            DataObject delayFromDB = hdb.rfCostEstimationData(
                "computation_delay", implementation.id(), name_);       
            delay = delayFromDB.doubleValue();
#ifdef DEBUG_DELAY_ESTIMATION
            Application::logStream() 
                << rf.name() << " computation delay " << delay << std::endl;
#endif
            return true;
        } catch (const KeyNotFound&) {
            // if no data found, don't even try to estimate the area
            Application::logStream()
                << "No computation_delay cost data found for RF " 
                << implementation.id() << ", plugin " << name_ << std::endl;
            return false;
        } catch (const Exception& e) {
            // for example, if doubleValue() conversion failed, then it's
            // a problem with HDB contents 
            debugLog(e.errorMessage());
            return false;
        }
 
        return false;
    }
 
    /**
     * Estimates the energy consumed by given RF.
     *
     * Estimate is done by computing the sum of all register file access
     * type energies and RF idle energy. Register file access energies are 
     * stored with entries named 'rf_access_energy Nr Nw'. Nr is the number
     * of read accesses, Nw the number of write accesses. For example,
     * 'rf_access_energy 1 3' is the name of entry which tells how much
     * energy is consumed by the RF in case RF is accessed simultaneously
     * once for reading and trice for writing. Idle energy is stored in
     * entry 'rf_idle_energy'.
     */
    bool estimateEnergy(
        const TTAMachine::BaseRegisterFile& rf,
        const IDF::RFImplementationLocation& implementation,
        const TTAProgram::Program&,
        const ExecutionTrace& trace,
        EnergyInMilliJoules& energy,
        HDB::HDBManager& hdb) {
 
//#define DEBUG_ENERGY_ESTIMATION
 
        energy = 0.0;
        ClockCycleCount cyclesWithRFAccess = 0;
#ifdef DEBUG_ENERGY_ESTIMATION        
        Application::logStream() 
            << "## register file " << rf.name() << ": " << std::endl;
#endif
        try {
            ExecutionTrace::ConcurrentRFAccessCountList* accessList =
                trace.registerFileAccessCounts(rf.name());
            for (ExecutionTrace::ConcurrentRFAccessCountList::
                     const_iterator i = accessList->begin(); 
                 i != accessList->end(); ++i) {
                const ExecutionTrace::ConcurrentRFAccessCount& accessCount = 
                    *i;
 
                const std::size_t reads = accessCount.get<0>();
                const std::size_t writes = accessCount.get<1>();
                const ClockCycleCount count = accessCount.get<2>();
                const std::string dataName = 
                    std::string("rf_access_energy ") + 
                    Conversion::toString(reads) + " " +
                    Conversion::toString(writes);
 
                try { 
                    DataObject energyFromDB = hdb.rfCostEstimationData(
                        dataName, implementation.id(), name_);
                    EnergyInMilliJoules energyOfAccess =
                        energyFromDB.doubleValue()*count;
#ifdef DEBUG_ENERGY_ESTIMATION        
                    Application::logStream() 
                        << "## reads " << accessCount.get<0>() << " "
                        << "writes " << accessCount.get<1>() << " = "
                        << energyFromDB.doubleValue() << " times " 
                        << count << " = " << energyOfAccess << std::endl;
#endif
                    energy += energyOfAccess;
                    cyclesWithRFAccess += count;
                } catch (const KeyNotFound&) {
                    // if no data found, don't even try to estimate the area
                    delete accessList;
                    accessList = NULL;
                    Application::logStream()
                        << "Cost estimation data '" << dataName 
                        << "' not found in HDB." << std::endl;
                    return false;
                } catch (const Exception& e) {
                    delete accessList;
                    accessList = NULL;
                    debugLog(e.errorMessage());
                    return false;
                }
            }
            delete accessList;
            accessList = NULL;
        } catch (const Exception& e) {
            debugLog(e.errorMessage());
            return false;
        }
 
        // add the cost of RF idling
        const ClockCycleCount idleCycles = 
            trace.simulatedCycleCount() - cyclesWithRFAccess;
        const std::string dataName = std::string("rf_idle_energy");
        
        try { 
            DataObject energyFromDB = hdb.rfCostEstimationData(
                dataName, implementation.id(), name_);
            EnergyInMilliJoules idleEnergy =
                energyFromDB.doubleValue()*idleCycles;
#ifdef DEBUG_ENERGY_ESTIMATION        
            Application::logStream() 
                << "## idle energy " << energyFromDB.doubleValue() << " times "
                << idleCycles << " = " << idleEnergy << std::endl;
 
#endif
            energy += idleEnergy;
 
        } catch (const KeyNotFound&) {
            // if no data found, don't even try to estimate the area
            Application::logStream()
                        << "Cost estimation data '" << dataName 
                        << "' not found in HDB." << std::endl;
            return false;
        } catch (const Exception& e) {
            debugLog(e.errorMessage());
            return false;
        }
 
        return true;
    }
 
 
};
 
EXPORT_RF_COST_ESTIMATOR_PLUGIN(StrictMatchRFEstimator)