BFScheduleExact.cc

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/*
    Copyright (c) 2002-2014 Tampere University.
 
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/**
 * @file BFScheduleExact.cc
 *
 * Declaration of BFScheduleExact class
 *
 * Tries to schedule a move to an exact cycle (no order).
 *
 * @author Heikki Kultala 2014-2020(heikki.kultala-no.spam-tuni.fi)
 * @note rating: red
 */
 
#include "BFScheduleExact.hh"
#include "BFRegCopyBefore.hh"
#include "BFRegCopyAfter.hh"
#include "SimpleResourceManager.hh"
#include "MoveNode.hh"
#include "DataDependenceGraph.hh"
#include "Move.hh"
#include "Machine.hh"
#include "ControlUnit.hh"
#include "TerminalImmediate.hh"
#include "BF2Scheduler.hh"
#include "BFScheduleBU.hh"
#include "BFEarlyGuardBypass.hh"
#include "MoveGuard.hh"
#include "Guard.hh"
 
bool
BFScheduleExact::operator()() {
 
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\tScheduling to exact cycle: " << mn_.toString()
              << " to cycle: " << c_ << std::endl;
#endif
    BFRegCopy* regCopyBefore = NULL;
    //BFRegCopy* regCopyAfter = NULL;
    BFRegCopy* regCopy = NULL;
 
    if (!mn_.move().isUnconditional() &&
        mn_.move().guard().guard().parentBus() == nullptr) {
        if (!runPreChild(new BFEarlyGuardBypass(sched_, mn_))) {
            std::cerr << "Early guard bypass failed!" << std::endl;
            return false;
        }
    }
    if (allowRegCopy_ && !canBeScheduled(mn_)) {
        if (mn_.isSourceOperation()) {
            // assumes the result read is wanted to the exact cycle.
            // reg cpy after both splits the move and schedules the copy.
            // TODO: should it be scheudled TD instead of BU then?
            regCopy = new BFRegCopyAfter(sched_,mn_, INT_MAX);
        } else {
            // this only splits the move. scheduled later.
            regCopyBefore = regCopy = new BFRegCopyBefore(sched_,mn_, INT_MAX);
        }
 
        if (!runPreChild(regCopy)) {
            return false;
        }
    }
    int ddglc = ddg().latestCycle(mn_, ii(), false, false);
    int ddgec = ddg().earliestCycle(mn_, ii(), false, false);
#ifdef DEBUG_BUBBLEFISH_SCHEDULER
    std::cerr << "\t\t\tddg lc: " << ddglc << std::endl;
    std::cerr << "\t\t\tddg ec: " << ddgec << std::endl;
#endif
    if (ddglc >= c_ && ddgec <= c_ && canAssign(c_, mn_, nullptr, srcFU_)) {
        createdCopy_ = assign(c_, mn_, nullptr, srcFU_);
        if (regCopyBefore != NULL) {
            MoveNode* regCopy = regCopyBefore->getRegCopy();
            BFScheduleBU* regCopySched =
                new BFScheduleBU(sched_, *regCopy, c_-1, false, false, false);
            if (!runPostChild(regCopySched)) {
                undo();
                return false;
            }
        }
        return true;
    } else {
        undoAndRemovePreChildren();
        return false;
    }
}
 
void
BFScheduleExact::undoOnlyMe() {
    unassign(mn_, createdCopy_);
    if (jumpLimitMove_) {
        jumpLimitMove_->setSource(
            new TTAProgram::TerminalImmediate(
                SimValue(oldJumpLimit_, oldJumpLimitWidth_)));
        jumpLimitMove_ = NULL;
    }
}