function average(list) {
  var n = list.length;
  var sum = SIMD.Float32x4.splat(0.0);
      sum,
      SIMD.Float32x4.load(list, i)
    );
  }
              SIMD.Float32x4.extractLane(sum, 1) +
              SIMD.Float32x4.extractLane(sum, 2) +
              SIMD.Float32x4.extractLane(sum, 3);
  return total / n;