BFSchedulePreLoopShared.cc

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/**
 * @file BFSchedulePreLoopShared.cc
 *
 * Definition of BFSchedulePreLoopShared class.
 *
 * Schedules an loop-operand-shared move in the prolog of the loop.
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
#include "BFSchedulePreLoopShared.hh"
#include "SimpleResourceManager.hh"
#include "MoveNodeDuplicator.hh"
#include "DataDependenceGraph.hh"
#include "BF2Scheduler.hh"
#include "Move.hh"
 
bool BFSchedulePreLoopShared::operator()() {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\tScheduling pre-loop-shared operand: "
              << originalMN_.toString()
              << std::endl;
#endif
    auto a = duplicator().duplicateMoveNode(originalMN_, true, true);
    prologMN_ = a.first;
 
    // These should always be unconditional. Operand moves have
    // no side effects, and nobody else uses the FU,
    // and the value of the guard might change between the iterations
    if (!prologMN_->move().isUnconditional()) {
        prologMN_->move().setGuard(NULL);
    }
    if (prologMN_ == NULL) {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\tMissing prolog MN for the move. " << std::endl;
#endif
        return false;
    }
    int ddgLC = prologDDG()->latestCycle(*prologMN_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\tddg lc: " << ddgLC << std::endl;
#endif
    if (ddgLC < 0) {
        duplicator().disposeMoveNode(prologMN_);
        return false;
    }
    int lastCycleOfProlog = rm().initiationInterval()-1+
        BF2Scheduler::PROLOG_CYCLE_BIAS;
    int rmlc = prologRM()->latestCycle(
        std::min(ddgLC, lastCycleOfProlog), *prologMN_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\trmlc: " << rmlc << std::endl;
#endif
    if (rmlc < 0) {
        duplicator().disposeMoveNode(prologMN_);
        return false;
    }
    prologRM()->assign(rmlc, *prologMN_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "scheduling of pre-loop opshare ok!"
              << prologMN_->toString() << std::endl;
#endif
    return true;
}
 
void BFSchedulePreLoopShared::undoOnlyMe() {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "undoing scheudle of pre-loop opschare: "
              << prologMN_->toString() << std::endl;
#endif
    prologRM()->unassign(*prologMN_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "unassigned scheudle of pre-loop opschare: "
              << prologMN_->toString() << std::endl;
#endif
 
    duplicator().disposeMoveNode(prologMN_);
}