FUBroker.cc

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/*
    Copyright (c) 2002-2016 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file InputFUBroker.cc
 *
 * Implementation of InputFUBroker class.
 *
 * @author Heikki Kultala 2016-2020 (heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
#include "FUBroker.hh"
#include "Move.hh"
#include "Terminal.hh"
#include "FunctionUnit.hh"
 
std::pair<bool, const TTAMachine::FunctionUnit*> FUBroker::findDstFUOfMove(
    const MoveNode& node, const TTAMachine::FunctionUnit* resFU,
    DataDependenceGraph::NodeSet& processedInputNodes) const {
    // already processed this once. do not do it twice
    if (processedInputNodes.count(const_cast<MoveNode*>(&node))) {
        return std::make_pair(true, resFU);
    }
    processedInputNodes.insert(const_cast<MoveNode*>(&node));
    const TTAProgram::Move& move = node.move();
    const TTAProgram::Terminal& dst = move.destination();
    if (!dst.isFUPort()) {
        throw InvalidData(
            __FILE__, __LINE__, __func__,
            "Output move does not have FU source!");
    }
    const TTAMachine::FunctionUnit& fu = dst.functionUnit();
    if (hasResourceOf(fu)) {
        if (resFU == NULL) {
            resFU = &fu;
        } else {
            if (resFU != &fu) {
                return std::make_pair(false, resFU);
                // illegal/empty
            }
        }
    }
    for (unsigned int i = 0; i < node.destinationOperationCount(); i++) {
        ProgramOperation& po = node.destinationOperation(i);
        auto a = findFUOfPO(po, resFU);
        if (a.first) {
            resFU = a.second;
        } else {
            return a;
        }
    }
    return std::make_pair(true, resFU);
}
 
 
// first part is if no conflict?
std::pair<bool, const TTAMachine::FunctionUnit*> FUBroker::findFUOfPO(
    ProgramOperation& po, const TTAMachine::FunctionUnit* resFU) const {
 
    const TTAMachine::FunctionUnit* fu = po.scheduledFU();
 
    // did not find anything. use default or return not found.
    if (fu == nullptr) {
        if (resFU && !po.isLegalFU(*resFU)) {
            return std::make_pair(false, resFU);
        }
        return std::make_pair(true, resFU);
    }
 
    // illegal annotations?
    if (!po.isLegalFU(*fu)) {
        return std::make_pair(false, resFU);
    }
 
    assert(hasResourceOf(*fu));
    // did find something, but it's different than default
    if (fu != resFU) {
        if (resFU == nullptr) {
            // default was null, use then one found
            return std::make_pair(true, fu);
        } else {
            // default not null. conflict! return not found.
            return std::make_pair(false, resFU);
        }
    }
    // fu and resfu are the same? ok!
    return std::make_pair(true,fu);
 
}