[PATCH 0/4] core/conv: Fast Viterbi decoding

Alexander Chemeris alexander.chemeris at gmail.com
Wed Apr 20 10:55:29 UTC 2016

Hi Thomas, Sylvain,

Recent activity around convolutional coding has reminded me about this
lost diamond. Just wondering if there is a chance to resolve the
critical issues and get this merged?

On Sat, Aug 1, 2015 at 12:16 AM, Sylvain Munaut <246tnt at gmail.com> wrote:
> Ok, so I finally took some time to re-read this.
> First a quick comment on each patch.
> Patch 1/4: See below
> Patch 2/4: Didn't really look deeply yet, but at first glance looks
> OK, I'd say let's focus on getting the infra of patch 1 merged first.
> Patch 3/4: I'm pretty sure -march=native will wreck cross-compiling
> Patch 4/4: Looks good
> For patch 1:
>  * About the state persistence, let's just ignore it for now. It does
> cost some performance but there is no easy fix, the perf improvement
> even with this over head is still massive and we can deal with it
> internally later.
>  * The symbol visibility and naming comments raised in the thread need
> to be dealt with. To sum up there is 3 kinds of symbols/names :
>     - Global functions / structures: Those that either appear in the
> header or that are visible when doing an objdump on the resulting .so
> . Those all need the osmo_ prefix
>     - Internal to the lib: Those that are accessed between several
> files in the lib. Those don't need an osmo_ prefix for brevity, but
> they need something less conflicted than 'gen_' ... include 'viterbi'
> or 'conv' or something to that effect in the name. They need to be
> hidden from the outside (so they shouldn't show up in the resulting
> .so), not sure about the current fvisibility situation in libosmocore
> (don't know if we explicitely mark exported function or if we
> explicitely mark non-exported one).
>     - Internal to the file: Make sure they're static, naming is fairly
> irrelevant
> So I'd say re-submit patch 1 and 4 first, forward ported to apply
> cleanly and pass a make distcheck on current master. We'll get that
> merged first, then look at integrating the SSE stuff.
> Cheers,
>    Sylvain

Alexander Chemeris.
CEO, Fairwaves, Inc.

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