BFShareOperand.cc

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/*
    Copyright (c) 2002-2014 Tampere University.
 
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/**
 * @file BFShareOperand.cc
 *
 * Definition of BFShareOperand class.
 *
 * Performs an operands sharing between two (or more) operations
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
#include "BFShareOperand.hh"
#include "MoveNode.hh"
#include "DataDependenceGraph.hh"
#include "Move.hh"
#include "Terminal.hh"
#include "MoveNodeDuplicator.hh"
 
bool BFShareOperand::operator()() {
    if (removed_.move().destination().operationIndex()
        != shared_.move().destination().operationIndex()) {
        return false;
    }
    while (removed_.destinationOperationCount()) {
        ProgramOperationPtr op = removed_.destinationOperationPtr(0);
        removed_.removeDestinationOperation(&*op);
        op->removeInputNode(removed_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\tRemoved: " << removed_.toString()
                  << " from: " << op->toString() << std::endl;
#endif
 
        shared_.addDestinationOperationPtr(op);
        op->addInputNode(shared_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\tAdded: " << shared_.toString()
                  << " to: " << op->toString() << std::endl;
#endif
 
        // update also prolog movenodes.
        if (ii()) {
            MoveNode* prologMNOfRemoved = duplicator().getMoveNode(removed_);
            ProgramOperationPtr prologPO;
            if (prologMNOfRemoved) {
                prologPO = prologMNOfRemoved->destinationOperationPtr(0);
                prologMNOfRemoved->removeDestinationOperation(&*prologPO);
                prologPO->removeInputNode(*prologMNOfRemoved);
            } else {
                prologPO = duplicator().getProgramOperation(op);
            }
 
            MoveNode* prologMNOfShared = duplicator().getMoveNode(shared_);
            if (prologMNOfShared) {
                if (prologPO == nullptr) {
                    prologPO = duplicator().duplicateProgramOperationPtr(op);
                    createdPrologPOs_.insert(prologPO);
                }
                prologMNOfShared->addDestinationOperationPtr(prologPO);
                prologPO->addInputNode(*prologMNOfShared);
            }
        }
        ops_.push_back(op);
    }
    return true;
}
 
void
BFShareOperand::undoOnlyMe() {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\t\tBFShareOperand undoing itseld, shared: "
              << shared_.toString() << std::endl;
#endif
    while(ops_.size()) {
        ProgramOperationPtr op = *ops_.rbegin();
 
        if (ii()) {
            ProgramOperationPtr prologPO =
                duplicator().getProgramOperation(op);
 
            MoveNode* prologMNOfShared = duplicator().getMoveNode(shared_);
            MoveNode* prologMNOfRemoved = duplicator().getMoveNode(removed_);
 
            if (prologMNOfShared) {
                // if the mn is duplicated, also the PO should be duplicated
                assert(prologPO != nullptr);
                prologPO->removeInputNode(*prologMNOfShared);
                prologMNOfShared->removeDestinationOperation(&*prologPO);
            }
 
            if (prologMNOfRemoved) {
                // if the mn is duplicated, also the PO should be duplicated
                assert(prologPO != nullptr);
                prologPO->addInputNode(*prologMNOfRemoved);
                prologMNOfRemoved->addDestinationOperationPtr(prologPO);
            }
        }
 
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\t\tRestoring, op: "
                  << op->toString() << std::endl;
#endif
        op->removeInputNode(shared_);
        shared_.removeDestinationOperation(&*op);
        op->addInputNode(removed_);
        removed_.addDestinationOperationPtr(op);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\t\tRestored: " << removed_.toString()
                  << " to: " << op->toString() << std::endl;
#endif
        ops_.pop_back();
    }
}