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Texas Instruments TMS320C64X User Manual

Page 69

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DSP_fir_cplx_hM4X4

4-41

C64x+ DSPLIB Reference

Special Requirements

-

The number of coefficients nh must be larger or equal to 4 and a multiple
of 4.

-

The number of output samples nr must be a multiple of 4.

Implementation Notes

-

Bank Conflicts: No bank conflicts occur.

-

Interruptibility: The code is fully interruptible.

-

The outer loop is unrolled 4 times while the inner loop is not unrolled.

-

Both inner and outer loops are collapsed in one loop.

-

ADDAH and SUBAH are used along with PACKH2 to perform
accumulation, shift and data packing.

-

Collapsed one stage of epilog and prolog each.

Benchmarks

Cycles

nr * nh*9/16 + 40

Codesize

384 bytes