BFDRELoop.hh

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/**
 * @file BFDRELoop.hh
 *
 * Declaration of BFDRELoop class
 *
 * Performs a dead-result elimination of a loop-bypassed move.
 * The move which is eliminated from the loop body is still left
 * in the epilog, to have correct value for the register after
 * the loop.
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
#ifndef BF_DRE_LOOP_HH
#define BF_DRE_LOOP_HH
 
#include "BFKillNode.hh"
 
class MoveNode;
 
class BFDRELoop : public BFKillNode {
public:
    BFDRELoop(BF2Scheduler& sched, MoveNode& mn, int srcCycle) :
        BFKillNode(sched, mn), srcCycle_(srcCycle), prologMN_(NULL),
        createdPrologCopy_(false) {}
    bool operator()();
    void undoOnlyMe();
    bool dreAllowed();
private:
    unsigned int srcCycle_;
    MoveNode* prologMN_;
    bool createdPrologCopy_;
};
 
#endif