BFRemoveGuardFromSucc.cc

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/**
 * @file BFRemoveGuardFromSucc.cc
 *
 * Definition of BFRemoveGuardFromSucc class
 *
 * Tries to remove a guard from a move which is a successor of a move
 * being schedule, to allow the guard write move to be scheduled later.
 *
 * The guard can be removed, if the move has no side effects.
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
#include "BFRemoveGuardFromSucc.hh"
#include "MoveGuard.hh"
#include "Move.hh"
#include "BFScheduleMove.hh"
#include "DataDependenceGraph.hh"
#include "BFRemoveEdge.hh"
#include "MoveNodeDuplicator.hh"
 
bool BFRemoveGuardFromSucc::operator()() {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\tRemoving guard from succ: " << mn_.toString()
              << std::endl;
#endif
    int cycle = mn_.cycle();
    BFOptimization* unsched = new BFUnscheduleMove(sched_, mn_);
    if (!runPreChild(unsched)) {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\tUnsched failed: " << mn_.toString()
                  << std::endl;
#endif
        return false;
    }
 
    // Remove the guard edges from the ddg
    auto inEdges = ddg().inEdges(mn_);
    for (auto e: inEdges) {
        if (e->guardUse() && !e->isFalseDep()) {
            runPreChild(new BFRemoveEdge(sched_, ddg().tailNode(*e), mn_,*e));
        }
    }
    auto outEdges = ddg().outEdges(mn_);
    for (auto e: outEdges) {
        if (e->guardUse() &&
            e->dependenceType() == DataDependenceEdge::DEP_WAR) {
            runPreChild(new BFRemoveEdge(sched_, mn_,ddg().headNode(*e), *e));
        }
    }
 
    // If the prolog move has already been created, update also it
    MoveNode* prologMN = ii() ? duplicator().getMoveNode(mn_) : nullptr;
    if (prologMN != nullptr) {
        prologMN->move().setGuard(NULL);
    }
 
    guard_ = mn_.move().guard().copy();
    mn_.move().setGuard(NULL);
    BFOptimization* sched = new BFSchedule(sched_, mn_, cycle);
    if (runPostChild(sched)) {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\tRe-scheduling ok: " << mn_.toString()
                  << std::endl;
#endif
        return true;
    } else {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
        std::cerr << "\t\t\t\tRe-scheduling failed, undoing..: "
                  << mn_.toString() << std::endl;
#endif
        undo();
        return false;
    }
}
 
void BFRemoveGuardFromSucc::undoOnlyMe() {
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\tRestoring guard to succ: " << mn_.toString()
              << std::endl;
#endif
 
    // If the prolog move has already been created, update also it
    MoveNode* prologMN = ii() ? duplicator().getMoveNode(mn_) : nullptr;
    if (prologMN != nullptr) {
        prologMN->move().setGuard(guard_->copy());
    }
 
    mn_.move().setGuard(guard_);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\tRestored guard to succ: " << mn_.toString()
              << std::endl;
#endif
 
}