BFShareOperandWithScheduled.cc

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/**
 * @file BFShareOperandWithScheduled.cc
 *
 * Definition of BFShareOperandWithScheduled class
 *
 * Performs an operands sharing between two (or more) operations,
 * between scheudling these operations.
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
 
#include "BFShareOperandWithScheduled.hh"
#include "MoveNode.hh"
#include "Move.hh"
#include "Terminal.hh"
#include "DataDependenceGraph.hh"
#include "BF2Scheduler.hh"
#include "Bus.hh"
#include "MoveNodeDuplicator.hh"
#include "SimpleResourceManager.hh"
 
bool BFShareOperandWithScheduled::operator()() {
    if (removed_.move().destination().operationIndex() !=
        shared_.move().destination().operationIndex()) {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\tDestination operand index mismatch"
                  << std::endl;
#endif
        return false;
    }
 
    originalRemovedBus_ = &removed_.move().bus();
    originalCycle_ = removed_.cycle();
 
    if (removed_.move().source().isImmediateRegister()) {
        oldImmWriteCycle_ = rm().immediateWriteCycle(removed_);
        immRegIndex_ = removed_.move().source().index();
        immu_ = &removed_.move().source().immediateUnit();
    }
 
    MoveNode* removedPrologMN = ii() ?
        duplicator().getMoveNode(removed_) :
        NULL;
    if (removedPrologMN != NULL) {
        prologBus_ = &removedPrologMN->move().bus();
 
    if (removedPrologMN->move().source().isImmediateRegister()) {
        prologImmWriteCycle_ =
            prologRM()->immediateWriteCycle(*removedPrologMN);
    }
 
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\tShareOpWithSched Saving prolog bus: "
                  << prologBus_->name() << std::endl;
        std::cerr << "\t\t\t\t\tProlog move: " << removedPrologMN->toString()
                  << std::endl;
#endif
    }
 
    unassign(removed_, false);
    if (BFShareOperand::operator()()) {
        ddg().dropNode(removed_);
        sched_.nodeAndCopyKilled(removed_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\tShared operand ok!" << std::endl;
#endif
        return true;
    } else {
        sched_.nodeResurrected(removed_);
        ddg().restoreNodeFromParent(removed_);
        assign(originalCycle_, removed_, originalRemovedBus_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\t\tShare operand failed!" << std::endl;
#endif
        return false;
    }
}
 
void BFShareOperandWithScheduled::undoOnlyMe() {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\t\t\tUndoing operandshare: " << shared_.toString()
              << std::endl;
#endif
    BFShareOperand::undoOnlyMe();
    sched_.nodeResurrected(removed_);
    ddg().restoreNodeFromParent(removed_);
    assign(originalCycle_, removed_, originalRemovedBus_, NULL, NULL,
           prologBus_, oldImmWriteCycle_, prologImmWriteCycle_, immu_,
           immRegIndex_);
}