public static Numeric <T> operator -(Numeric <T> a, Numeric <T> b) => Implementation.Subtract(a, b);
protected void kf_bfly2(Array <kiss_fft_cpx <kiss_fft_scalar> > Fout, int fstride, int m)
{
Array <kiss_fft_cpx <kiss_fft_scalar> > Fout2;
Array <kiss_fft_cpx <kiss_fft_scalar> > tw1 = new Array <kiss_fft_cpx <kiss_fft_scalar> >(Twiddles);
kiss_fft_cpx <kiss_fft_scalar> t;
Fout2 = Fout + m;
do
{
Fout[0] = A.FixDivide(Fout[0], 2);
Fout2[0] = A.FixDivide(Fout2[0], 2);
t = A.Multiply(Fout2[0], tw1[0]);
tw1 += fstride;
Fout2[0] = A.Subtract(Fout[0], t);
Fout[0] = A.Add(Fout[0], t);
++Fout2;
++Fout;
} while (--m != 0);
}