Texas Instruments TMS320C64X manual DSPifft16x16

DSP_ifft16x16

Implementation Notes

	- Bank Conflicts: No bank conflicts occur.
	- Interruptibility: The code is interruptible.
	- The routine uses log4(nx) − 1 stages of radix-4 transform and performs
	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 fft16x16 implementation notes, as similar ideas are used.
Benchmarks	Cycles	(6 * nx/8 + 19) * ceil[log4(nx) − 1] + 8 * nx/8 + 30
	Codesize	864 bytes

C64x+ DSPLIB Reference 4-31