[opus] [PATCH] Refactor silk_LPC_analysis_filter() & Optimize celt_fir_permit_overflow() for ARM NEON

[Linfeng Zhang]

Hi Timothy,

Do you think it would be possible to improve the API of xcorr_kernel() so
> that calling it in a loop is more efficient?
>

If it could be inlined, it will be more efficient. Besides memory bouncing,
frequent function call is expensive.

The other advantage to wiring up xcorr_kernel() is that it applies in more
> places than your intrinsics-only celt_fir() implementation.
>

I agree.

One solution is to put the outer for(N) loop inside xcorr_kernel() to let
it return N results instead of 4 (similar to the celt_fir() NEON intrinsics
did). This will make it efficient plus universal.

Thanks,
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