Пример #1
0
SILValue BlockState::reduceValuesAtEndOfBlock(RLEContext &Ctx, LSLocation &L) {
  // First, collect current available locations and their corresponding values
  // into a map.
  LSLocationValueMap Values;

  LSLocationList Locs;
  LSLocation::expand(L, &BB->getModule(), Locs, Ctx.getTE());

  // Find the values that this basic block defines and the locations which
  // we do not have a concrete value in the current basic block.
  ValueTableMap &OTM = getForwardValOut();
  for (unsigned i = 0; i < Locs.size(); ++i) {
    Values[Locs[i]] = Ctx.getValue(OTM[Ctx.getLocationBit(Locs[i])]);
  }

  // Second, reduce the available values into a single SILValue we can use to
  // forward.
  SILValue TheForwardingValue;
  TheForwardingValue = LSValue::reduce(L, &BB->getModule(), Values,
                                       BB->getTerminator(), Ctx.getTE());
  /// Return the forwarding value.
  return TheForwardingValue;
}
Пример #2
0
BlockState::ValueState BlockState::getValueStateAtEndOfBlock(RLEContext &Ctx,
                                                             LSLocation &L) {
  // Find number of covering value and concrete values for the locations
  // expanded from the given location.
  unsigned CSCount = 0, CTCount = 0;
  LSLocationList Locs;
  LSLocation::expand(L, &BB->getModule(), Locs, Ctx.getTE());

  ValueTableMap &OTM = getForwardValOut();
  for (auto &X : Locs) {
    LSValue &V = Ctx.getValue(OTM[Ctx.getLocationBit(X)]);
    if (V.isCoveringValue()) {
      ++CSCount;
      continue;
    }
    ++CTCount;
  }

  if (CSCount == Locs.size())
    return ValueState::CoverValues;
  if (CTCount == Locs.size())
    return ValueState::ConcreteValues;
  return ValueState::CoverAndConcreteValues;
}