Texas Instruments TMS320C64X Instrukcja Użytkownika Pobierz pdf (Strona 85)

DSP_iirlat

4-57 C64x+ DSPLIB Reference

rt = rt − (short)(b[i] >> 15) * k[i];

b[i + 1] = b[i] + (short)(rt >> 15) * k[i];

}

b[0] = rt;

r[j] = rt >> 15;

}

Special Requirements

- nk must be >= 4.

- No special alignment requirements

- See Bank Conflicts for avoiding bank conflicts

Implementation Notes

- Bank Conflicts: nk should be a multiple of 2, otherwise bank conflicts

occur.

- Interruptibility: The code is interrupt-tolerant but not interruptible.

- Prolog and epilog of the inner loop are partially collapsed and overlapped

to reduce outer loop overhead.

Benchmarks Cycles (2 * nk + 7) * nx + 9 (without bank conflicts)

Codesize 352 bytes

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 168 169

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Texas Instruments TMS320C64X Instrukcja Użytkownika Strona 85