BFRemoveGuard.cc

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/**
 * @file BFRemoveGuard.cc
 *
 * Definition of BFRemoveGuard class
 *
 * Tries to remove a guard from a move.
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
#include "BFRemoveGuard.hh"
#include "Move.hh"
#include "MoveGuard.hh"
#include "BFRemoveEdge.hh"
#include "DataDependenceGraph.hh"
 
bool BFRemoveGuard::operator()() {
    assert(!mn_.move().isUnconditional());
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\tRemoving guard from move: "
              << mn_.toString() << std::endl;
#endif
 
    // 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));
        }
    }
 
    guard_ = mn_.move().guard().copy();
    mn_.move().setGuard(NULL);
    return true;
}
 
void BFRemoveGuard::undoOnlyMe() {
    mn_.move().setGuard(guard_);
}