Texas Instruments TMS320C67 DSP Series Programmer's Reference Manual page 33

DSPF_sp_bitrev_cplx
Special Requirements
4-8
a = i0 >> nbot;
if (!b) ia = index[a];
ib = index[b];
ibs = ib << nbot;
j0 = ibs + ia;
t = i0 < j0;
xi0 = x[i0];
xj0 = x[j0];
if (t)
{
x[i0] = xj0;
x[j0] = xi0;
}
i1 = i0 + 1;
j1 = j0 + halfn;
xi1 = x[i1];
xj1 = x[j1];
x[i1] = xj1;
x[j1] = xi1;
i3 = i1 + halfn;
j3 = j1 + 1;
xi3 = x[i3];
xj3 = x[j3];
if (t)
{
x[i3] = xj3;
x[j3] = xi3;
}
}
}
-
nx must be a power of 2.
-
The table from bitrev_index is already created.
-
The array x is actually an array of 2*nx floats. It is assumed to be double-
word aligned.