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BF707 CFFT benchmarks

Question asked by pinaz on Jul 16, 2015
Latest reply on Oct 21, 2015 by pinaz

The marketing from Analog:

 

http://www.analog.com/media/en/news-marketing-collateral/product-highlight/BF70x-Summary-Presentation.pdf

 

makes the claim:

 

"30% improved 16-bit CFFT benchmarks due to complex math improvements" (over the previous Blackfin)

 

However, the metrics given in cfft_fr16_bf2.asm and cfft_fr16.asm from CrossCore show:

 

No Scaling:

FFT sizeBF cycles
BF+ cycles
8278229
16408344
12821982072
25644464276
10241969819385

 

Static Scaling:

FFT sizeBF cyclesBF+ cycles
8268228
16395343
12821762059
25644224282
10241966719378

 

This is a lot less than a 30% improvement.  What am I missing?

 

Thanks.

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