protected void kf_bfly3(Array <kiss_fft_cpx <kiss_fft_scalar> > Fout, int fstride, int m)
{
int k = m;
int m2 = 2 * m;
Array <kiss_fft_cpx <kiss_fft_scalar> > tw1, tw2;
kiss_fft_cpx <kiss_fft_scalar>[] scratch = new kiss_fft_cpx <kiss_fft_scalar> [5];
kiss_fft_cpx <kiss_fft_scalar> epi3;
epi3 = Twiddles[fstride * m];
tw1 = new Array <kiss_fft_cpx <kiss_fft_scalar> >(Twiddles);
tw2 = new Array <kiss_fft_cpx <kiss_fft_scalar> >(Twiddles);
do
{
Fout[0] = A.FixDivide(Fout[0], 3);
Fout[m] = A.FixDivide(Fout[m], 3);
Fout[m2] = A.FixDivide(Fout[m2], 3);
scratch[1] = A.Multiply(Fout[m], tw1[0]);
scratch[2] = A.Multiply(Fout[m2], tw2[0]);
scratch[3] = A.Add(scratch[1], scratch[2]);
scratch[0] = A.Subtract(scratch[1], scratch[2]);
tw1 += fstride;
tw2 += fstride * 2;
Fout[m].r = A.Subtract(Fout[0].r, A.Half(scratch[3].r));
Fout[m].i = A.Subtract(Fout[0].i, A.Half(scratch[3].i));
scratch[0] = A.Multiply(scratch[0], epi3.i);
Fout[0] = A.Add(Fout[0], scratch[3]);
Fout[m2].r = A.Add(Fout[m].r, scratch[0].i);
Fout[m2].i = A.Subtract(Fout[m].i, scratch[0].r);
Fout[m].r = A.Subtract(Fout[m].r, scratch[0].i);
Fout[m].i = A.Add(Fout[m].i, scratch[0].r);
++Fout;
} while (--k != 0);
}
