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Mark Borgerding 2004-04-27 01:36:26 +00:00
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@ -21,3 +21,11 @@ Reducing code size:
consider creating a hardcoded kiss_fft_state. In other words, decide which consider creating a hardcoded kiss_fft_state. In other words, decide which
FFT size(s) you want and make a structure with the correct factors and twiddles. FFT size(s) you want and make a structure with the correct factors and twiddles.
* Frank van der Hulst offered numerous suggestions for smaller code size and correct operation
on embedded targets. "I'm happy to help anyone who is trying to implement KISSFFT on a micro"
Some of these were rolled into the mainline code base:
- using long casts to promote intermediate results of short*short multiplication
- delaying allocation of buffers that are sometimes unused.
In some cases, it may be desirable to limit capability in order to better suit the target:
- predefining the twiddle tables for the desired fft size.