Texas Instruments TMS320C64X Instrukcja Użytkownika Pobierz pdf (Strona 49)

DSP_fft16x16r

4-21 C64x+ DSPLIB Reference

k = (k0 << 6) | k1;

if (l0 < 0)

k = k << −l0;

else

k = k >> l0;

j++; /* multiple of 4 index */

x0 = ptr_x0[0]; x1 = ptr_x0[1];

x2 = ptr_x0[2]; x3 = ptr_x0[3];

x4 = ptr_x0[4]; x5 = ptr_x0[5];

x6 = ptr_x0[6]; x7 = ptr_x0[7];

ptr_x0 += 8;

xh0_0 = x0 + x4;

xh1_0 = x1 + x5;

xh0_1 = x2 + x6;

xh1_1 = x3 + x7;

if (radix == 2)

{

xh0_0 = x0;

xh1_0 = x1;

xh0_1 = x2;

xh1_1 = x3;

}

yt0 = xh0_0 + xh0_1;

yt1 = xh1_0 + xh1_1;

yt4 = xh0_0 − xh0_1;

yt5 = xh1_0 − xh1_1;

xl0_0 = x0 − x4;

xl1_0 = x1 − x5;

xl0_1 = x2 − x6;

xl1_1 = x3 − x7;

if (radix == 2)

{

xl0_0 = x4;

xl1_0 = x5;

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Texas Instruments TMS320C64X Instrukcja Użytkownika Strona 49