public FFT3Kernel(int N, int logN, float W_re[], float W_im[])
public FFT3Kernel(int N, int logN, float W_re2a[], float W_im2a[])
  public FFT3Kernel(int N, int logN, float W_re[], float W_im[])    {     super(N, logN, W_re, W_im);   } 