int tmp = 0;
    for (int i = 0; i < reps; i++) {
      int j = i & ARRAY_MASK;
      tmp += impl.gcdInt(nonnegInt[j][0], nonnegInt[j][1]);
    }
    return tmp;
  }

  @Benchmark
  long longGCD(int reps) {
    long tmp = 0;
    for (int i = 0; i < reps; i++) {
      int j = i & ARRAY_MASK;
      tmp += impl.gcdLong(nonnegLong[j][0], nonnegLong[j][1]);
    }
    return tmp;
  }

  @Benchmark