Texas Instruments TMS320C64X - Manual (Page 46)

DSP_fft16x16r
4-18
{
int i, l0, l1, l2, h2, predj;
int l1p1,l2p1,h2p1, tw_offset, stride, fft_jmp;
short xt0, yt0, xt1, yt1, xt2, yt2;
short si1,si2,si3,co1,co2,co3;
short xh0,xh1,xh20,xh21,xl0,xl1,xl20,xl21;
short x_0, x_1, x_l1, x_l1p1, x_h2 , x_h2p1, x_l2, x_l2p1;
short *x,*w;
short *ptr_x0, *ptr_x2, *y0;
unsigned int j, k, j0, j1, k0, k1;
short x0, x1, x2, x3, x4, x5, x6, x7;
short xh0_0, xh1_0, xh0_1, xh1_1;
short xl0_0, xl1_0, xl0_1, xl1_1;
short yt3, yt4, yt5, yt6, yt7;
unsigned a, num;
stride = n; /* n is the number of complex samples */
tw_offset = 0;
while (stride > radix)
{
j = 0;
fft_jmp = stride + (stride>>1);
h2 = stride>>1;
l1 = stride;
l2 = stride + (stride>>1);
x = ptr_x;
w = ptr_w + tw_offset;
for (i = 0; i < n>>1; i += 2)
{
co1 = w[j+0];
si1 = w[j+1];
co2 = w[j+2];
si2 = w[j+3];
co3 = w[j+4];
si3 = w[j+5];
j += 6;
x_0 = x[0];