C++ SUnit::setHeightDirty方法代码示例

/// ComputeHeight - Calculate the maximal path from the node to the entry.
///
void SUnit::ComputeHeight() {
  SmallVector<SUnit*, 8> WorkList;
  WorkList.push_back(this);
  do {
    SUnit *Cur = WorkList.back();

    bool Done = true;
    unsigned MaxSuccHeight = 0;
    for (SUnit::const_succ_iterator I = Cur->Succs.begin(),
         E = Cur->Succs.end(); I != E; ++I) {
      SUnit *SuccSU = I->getSUnit();
      if (SuccSU->isHeightCurrent)
        MaxSuccHeight = std::max(MaxSuccHeight,
                                 SuccSU->Height + I->getLatency());
      else {
        Done = false;
        WorkList.push_back(SuccSU);
      }
    }

    if (Done) {
      WorkList.pop_back();
      if (MaxSuccHeight != Cur->Height) {
        Cur->setHeightDirty();
        Cur->Height = MaxSuccHeight;
      }
      Cur->isHeightCurrent = true;
    }
  } while (!WorkList.empty());
}

/// addPred - This adds the specified edge as a pred of the current node if
/// not already.  It also adds the current node as a successor of the
/// specified node.
void SUnit::addPred(const SDep &D) {
  // If this node already has this depenence, don't add a redundant one.
  for (unsigned i = 0, e = (unsigned)Preds.size(); i != e; ++i)
    if (Preds[i] == D)
      return;
  // Now add a corresponding succ to N.
  SDep P = D;
  P.setSUnit(this);
  SUnit *N = D.getSUnit();
  // Update the bookkeeping.
  if (D.getKind() == SDep::Data) {
    ++NumPreds;
    ++N->NumSuccs;
  }
  if (!N->isScheduled)
    ++NumPredsLeft;
  if (!isScheduled)
    ++N->NumSuccsLeft;
  Preds.push_back(D);
  N->Succs.push_back(P);
  if (P.getLatency() != 0) {
    this->setDepthDirty();
    N->setHeightDirty();
  }
}

/// removePred - This removes the specified edge as a pred of the current
/// node if it exists.  It also removes the current node as a successor of
/// the specified node.
void SUnit::removePred(const SDep &D) {
  // Find the matching predecessor.
  for (SmallVector<SDep, 4>::iterator I = Preds.begin(), E = Preds.end();
       I != E; ++I)
    if (*I == D) {
      bool FoundSucc = false;
      // Find the corresponding successor in N.
      SDep P = D;
      P.setSUnit(this);
      SUnit *N = D.getSUnit();
      for (SmallVector<SDep, 4>::iterator II = N->Succs.begin(),
             EE = N->Succs.end(); II != EE; ++II)
        if (*II == P) {
          FoundSucc = true;
          N->Succs.erase(II);
          break;
        }
      assert(FoundSucc && "Mismatching preds / succs lists!");
      Preds.erase(I);
      // Update the bookkeeping.
      if (P.getKind() == SDep::Data) {
        --NumPreds;
        --N->NumSuccs;
      }
      if (!N->isScheduled)
        --NumPredsLeft;
      if (!isScheduled)
        --N->NumSuccsLeft;
      if (P.getLatency() != 0) {
        this->setDepthDirty();
        N->setHeightDirty();
      }
      return;
    }
}

/// addPred - This adds the specified edge as a pred of the current node if
/// not already.  It also adds the current node as a successor of the
/// specified node.
bool SUnit::addPred(const SDep &D) {
  // If this node already has this depenence, don't add a redundant one.
  for (SmallVector<SDep, 4>::const_iterator I = Preds.begin(), E = Preds.end();
       I != E; ++I)
    if (*I == D)
      return false;
  // Now add a corresponding succ to N.
  SDep P = D;
  P.setSUnit(this);
  SUnit *N = D.getSUnit();
  // Update the bookkeeping.
  if (D.getKind() == SDep::Data) {
    assert(NumPreds < UINT_MAX && "NumPreds will overflow!");
    assert(N->NumSuccs < UINT_MAX && "NumSuccs will overflow!");
    ++NumPreds;
    ++N->NumSuccs;
  }
  if (!N->isScheduled) {
    assert(NumPredsLeft < UINT_MAX && "NumPredsLeft will overflow!");
    ++NumPredsLeft;
  }
  if (!isScheduled) {
    assert(N->NumSuccsLeft < UINT_MAX && "NumSuccsLeft will overflow!");
    ++N->NumSuccsLeft;
  }
  Preds.push_back(D);
  N->Succs.push_back(P);
  if (P.getLatency() != 0) {
    this->setDepthDirty();
    N->setHeightDirty();
  }
  return true;
}

/// addPred - This adds the specified edge as a pred of the current node if
/// not already.  It also adds the current node as a successor of the
/// specified node.
bool SUnit::addPred(const SDep &D) {
  // If this node already has this depenence, don't add a redundant one.
  for (SmallVector<SDep, 4>::iterator I = Preds.begin(), E = Preds.end();
       I != E; ++I) {
    if (I->overlaps(D)) {
      // Extend the latency if needed. Equivalent to removePred(I) + addPred(D).
      if (I->getLatency() < D.getLatency()) {
        SUnit *PredSU = I->getSUnit();
        // Find the corresponding successor in N.
        SDep ForwardD = *I;
        ForwardD.setSUnit(this);
        for (SmallVector<SDep, 4>::iterator II = PredSU->Succs.begin(),
               EE = PredSU->Succs.end(); II != EE; ++II) {
          if (*II == ForwardD) {
            II->setLatency(D.getLatency());
            break;
          }
        }
        I->setLatency(D.getLatency());
      }
      return false;
    }
  }
  // Now add a corresponding succ to N.
  SDep P = D;
  P.setSUnit(this);
  SUnit *N = D.getSUnit();
  // Update the bookkeeping.
  if (D.getKind() == SDep::Data) {
    assert(NumPreds < UINT_MAX && "NumPreds will overflow!");
    assert(N->NumSuccs < UINT_MAX && "NumSuccs will overflow!");
    ++NumPreds;
    ++N->NumSuccs;
  }
  if (!N->isScheduled) {
    assert(NumPredsLeft < UINT_MAX && "NumPredsLeft will overflow!");
    ++NumPredsLeft;
  }
  if (!isScheduled) {
    assert(N->NumSuccsLeft < UINT_MAX && "NumSuccsLeft will overflow!");
    ++N->NumSuccsLeft;
  }
  Preds.push_back(D);
  N->Succs.push_back(P);
  if (P.getLatency() != 0) {
    this->setDepthDirty();
    N->setHeightDirty();
  }
  return true;
}

/// removePred - This removes the specified edge as a pred of the current
/// node if it exists.  It also removes the current node as a successor of
/// the specified node.
void SUnit::removePred(const SDep &D) {
  // Find the matching predecessor.
  for (SmallVector<SDep, 4>::iterator I = Preds.begin(), E = Preds.end();
       I != E; ++I)
    if (*I == D) {
      // Find the corresponding successor in N.
      SDep P = D;
      P.setSUnit(this);
      SUnit *N = D.getSUnit();
      SmallVectorImpl<SDep>::iterator Succ = std::find(N->Succs.begin(),
                                                       N->Succs.end(), P);
      assert(Succ != N->Succs.end() && "Mismatching preds / succs lists!");
      N->Succs.erase(Succ);
      Preds.erase(I);
      // Update the bookkeeping.
      if (P.getKind() == SDep::Data) {
        assert(NumPreds > 0 && "NumPreds will underflow!");
        assert(N->NumSuccs > 0 && "NumSuccs will underflow!");
        --NumPreds;
        --N->NumSuccs;
      }
      if (!N->isScheduled) {
        if (D.isWeak())
          --WeakPredsLeft;
        else {
          assert(NumPredsLeft > 0 && "NumPredsLeft will underflow!");
          --NumPredsLeft;
        }
      }
      if (!isScheduled) {
        if (D.isWeak())
          --N->WeakSuccsLeft;
        else {
          assert(N->NumSuccsLeft > 0 && "NumSuccsLeft will underflow!");
          --N->NumSuccsLeft;
        }
      }
      if (P.getLatency() != 0) {
        this->setDepthDirty();
        N->setHeightDirty();
      }
      return;
    }
}

/// addPred - This adds the specified edge as a pred of the current node if
/// not already.  It also adds the current node as a successor of the
/// specified node.
bool SUnit::addPred(const SDep &D, bool Required) {
  // If this node already has this dependence, don't add a redundant one.
  for (SmallVectorImpl<SDep>::iterator I = Preds.begin(), E = Preds.end();
         I != E; ++I) {
    // Zero-latency weak edges may be added purely for heuristic ordering. Don't
    // add them if another kind of edge already exists.
    if (!Required && I->getSUnit() == D.getSUnit())
      return false;
    if (I->overlaps(D)) {
      // Extend the latency if needed. Equivalent to removePred(I) + addPred(D).
      if (I->getLatency() < D.getLatency()) {
        SUnit *PredSU = I->getSUnit();
        // Find the corresponding successor in N.
        SDep ForwardD = *I;
        ForwardD.setSUnit(this);
        for (SmallVectorImpl<SDep>::iterator II = PredSU->Succs.begin(),
               EE = PredSU->Succs.end(); II != EE; ++II) {
          if (*II == ForwardD) {
            II->setLatency(D.getLatency());
            break;
          }
        }
        I->setLatency(D.getLatency());
      }
      return false;
    }
  }
  // Now add a corresponding succ to N.
  SDep P = D;
  P.setSUnit(this);
  SUnit *N = D.getSUnit();
  // Update the bookkeeping.
  if (D.getKind() == SDep::Data) {
    assert(NumPreds < UINT_MAX && "NumPreds will overflow!");
    assert(N->NumSuccs < UINT_MAX && "NumSuccs will overflow!");
    ++NumPreds;
    ++N->NumSuccs;
  }
  if (!N->isScheduled) {
    if (D.isWeak()) {
      ++WeakPredsLeft;
    }
    else {
      assert(NumPredsLeft < UINT_MAX && "NumPredsLeft will overflow!");
      ++NumPredsLeft;
    }
  }
  if (!isScheduled) {
    if (D.isWeak()) {
      ++N->WeakSuccsLeft;
    }
    else {
      assert(N->NumSuccsLeft < UINT_MAX && "NumSuccsLeft will overflow!");
      ++N->NumSuccsLeft;
    }
  }
  Preds.push_back(D);
  N->Succs.push_back(P);
  if (P.getLatency() != 0) {
    this->setDepthDirty();
    N->setHeightDirty();
  }
  return true;
}