Texas Instruments TMS320C64X Programmer's Reference Manual page 69

Special Requirements
Implementation Notes
Benchmarks
-
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.
-
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.
Cycles nr * nh*9/16 + 40
Codesize 384 bytes
DSP_fir_cplx_hM4X4
C64x+ DSPLIB Reference 4-41