[Bluez-devel] sbc decoder unrolled

[Brad Midgley <bmidgley@xmission.com>]

Hey

woohoo... I worked over the decoder a lot more and finally unrolled & 
committed it. It still uses floating point for now.

I was very proud of the fact that I found a way to rotate which 
sbc_proto_x_x0 value we choose rather than shifting matrixed values 
around in every loop. It's even more clear that the implementation they 
illustrate in the spec is meant to make the algorithm clear but not be 
an efficient way to do it.

I don't know how the instruction cache size in arm compares to x86. I 
haven't checked to see yet if unrolling is as big a win on xscale. fwiw, 
it cut x86 cpu use by about 50% over the looped code.

I'll look at fixed point next.

Brad


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