Texas Instruments TMS320C64X Programmer's Reference Manual page 65

Implementation Notes
Benchmarks
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The FFT coefficients (twiddle factors) are generated using the program
tw_fft32x32 provided in the directory 'support\fft'. The scale factor must be
2147483647.5. No scaling is done with the function; thus the input data
must be scaled by 2
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Bank Conflicts: No bank conflicts occur.
-
Interruptibility: The code is interruptible.
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The routine uses log
either a radix-2 or radix-4 transform on the last stage depending on nx. If
nx is a power of 4, then this last stage is also a radix-4 transform, otherwise
it is a radix-2 transform.
-
See the fft16x16t implementation notes, as similar ideas are used.
Cycles (13*nx/8 + 28) * ceil(log
Codesize 960 bytes
log2(nx)
to completely prevent overflow.
(nx) − 1 stages of radix-4 transform and performs
4
(nx) − 1) + 6 * nx/4 + 39
4
C64x+ DSPLIB Reference
DSP_ifft32x32
4-37