洗牌算法，以随机打乱数组中元素的位置

测试数据创建

int[] _data;
Random rng = new Random();
protected override void CreateData()
{
    _data = new int[_size];
    for (int i = 0; i < _data.Length; i++)
    {
        _data[i] = i;
    }
}

普通打乱数组元素位置

protected override void OrdinaryMethod()
  {
      int n = (int)_size;
      while (n-- > 1)
      {
          int k = rng.Next(n + 1);
          int value = _data[k];
          _data[k] = _data[n];
          _data[n] = value;
      }
  }

simd打乱

readonly int[] mask = { 30, 39, 45, 54, 57, 75, 78, 99, 108, 114, 120, 135, 141, 147, 156, 177, 180, 198, 201, 210, 216, 225, 228 };
protected override void SimdMethod()
{
    int n = (int)_size;
    int vsize = Vector128<int>.Count;
    int m = n - (n & (vsize - 1));
    fixed (int* ptr = _data, maskPtr = mask)
    {
        int j = 0;
        int i = 0;
        for (j = 0; j < m; j += vsize)
        {
            Vector128<int> v = *(Vector128<int>*)(ptr + j);
            // 打乱
            var t = Sse2.Shuffle(v, (byte)*(maskPtr + rng.Next(mask.Length)));
            // 拷贝
            Sse2.Store(ptr + j, t);
            j += vsize;
        }
        for (; j < n; j++)
        {
            int* t = ptr + rng.Next(n);
            int* val = ptr + j;
            *val = (*t ^= *val ^= *t) ^ *val;
        }
    }
}

指令说明

Shuffle指令：用于根据提供的控制值（control）重新排列 Vector128<int> 类型向量中的元素。（比如洗牌算法打乱数组中元素的位置）。

Store指令：将向量的数据存储到内存地址。

补充，上面Simd打乱数组位置为局部打乱，下面是全局打乱

protected void SimdMethod2()
            {
            int n = (int)_size;
            int vsize = Vector128<int>.Count;
            int m = n - (n & (vsize - 1));
            Vector128<int>[] vectors = new Vector128<int>[m / vsize];
            fixed (int* ptr = _data, maskPtr = mask)
            {
                fixed (Vector128<int>* vptr = vectors)
                {
                    int j = 0;
                    int i = 0;
                    for (j = 0; j < m; j += vsize)
                    {
                        *(vptr + i++) = *(Vector128<int>*)(ptr + j);
                    }
                    j = 0;
                    for (i = 0; i < vectors.Length; i++)
                    {
                        Sse2.Store(ptr + j, Sse2.Shuffle(*(vptr + i), (byte)*(maskPtr + rng.Next(mask.Length))));
                        j += vsize;
                    }
                    for (; j < n; j++)
                    {
                        int* t = ptr + rng.Next(n);
                        int* val = ptr + j;
                        int temp = *t;
                        *t = *val;
                        *val = temp;
                    }
                }
            }
        }