int start = subspace.getStart().toInt();
VM_Address start = subspace.getStart();
  private void setTilenames(int numTiles) {    int tile = 0;    int start = subspace.getStart().toInt();    int first = subspace.getFirstIndex();    int bs = subspace.getBlockSize();    for (int i = 0; i < numTiles; ++i) {      if (subspace.indexInRange(i))         space.setTilename(i, start + (i - first) * bs, 	                     start + (i + 1 - first) * bs);    }  }