Another algorithm that seems to suck a lot of CPU is
phase_synth_zero_order() in decoding, and really the only thing in there is
atan2() and floor(). (you've already changed the sin/cos). So maybe the
CMSIS has a better version for those two?
I know floor() is really a slow algorithm in gcc.
http://stackoverflow.com/questions/824118/why-is-floor-so-slow
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