code: private static boolean needIncrement(MutableBigInteger mdivisor, int roundingMode,
                                           int qsign, MutableBigInteger mq, MutableBigInteger mr) {
          assert !mr.isZero();
          int cmpFracHalf = mr.compareHalf(mdivisor);
          return commonNeedIncrement(roundingMode, qsign, cmpFracHalf, mq.isOdd());
      }
docs: Tests if quotient has to be incremented according the roundingMode