| DSP_bitrev_cplx |
int | nbits, nbot, ntop, ndiff, n2, halfn; |
short | *xs = (short *) x; |
nbits = 0; | |
i = nx; | |
while (i > 1){ | |
i = i >> 1; | |
nbits++;} | |
nbot | = nbits >> 1; |
ndiff | = nbits & 1; |
ntop | = nbot + ndiff; |
n2 | = 1 << ntop; |
mask | = n2 − 1; |
halfn | = nx >> 1; |
for (i0 = 0; i0 < halfn; i0 += 2) {
b= i0 & mask; 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];
C64x+ DSPLIB Reference |
