Espruino/benchmark/qsort_3.js

// From TiCPU, http://forum.espruino.com/conversations/568

// Non-nested quick sort
Array.prototype.nqsort = function(depth) {
  var pivot, i=0, left, right;
  if (depth === undefined) {
    depth = parseInt(Math.floor(this.length/5), 10);
  }
  var begin = Uint16Array(depth);
  var end = Uint16Array(depth);
  begin[0] = 0;
  end[0] = this.length;
  while (i >= 0) {
    left = begin[i]; right = end[i]-1;
    if (left < right) {
      pivot = this[left];
      if (i === depth-1) return false;
      while (left < right) {
        while (this[right] >= pivot && left < right) right--;
        if (left < right) this[left++] = this[right];
        while (this[left] <= pivot && left < right) left++;
        if (left < right) this[right--] = this[left];
      }
      this[left] = pivot; begin[i+1] = left+1;
      end[i+1] = end[i]; end[i++] = left;
    } else i--;
  }
  return true;
};
Uint16Array.prototype.nqsort = Array.prototype.nqsort;

// Tests
var tQsort = new Uint16Array([5454,5449,5380,5412,5380,5366,5344,5395,5398,5424,5422,5473,5420,5432,5376,5354,5561,5288,5393,5388,5422,5427,5476,5407,5385,5180,5363,5324,5395,5393,5410,5405,5349,5361,5385,5412,5373,5373,5478,5420,5446,5395,5339,5407,5420,5356,5336,5427,5459,5378,5336,5349,5420,5405,5434,5383,5446,5422,5349,5329,5405,5434,5446,5336,5427,5473,5402,5170,5388,5412,5456,123,456,789]);
tQsort.nqsort();