[PD-dev] multi-architecture deken packages

[IOhannes m zmölnig]

On 4/14/21 23:59, Alexandre Torres Porres wrote:
> Em qua., 14 de abr. de 2021 às 18:29, IOhannes m zmölnig <zmoelnig at iem.at>
> escreveu:
> 
>>> But one can also just ship armv6 and aarch64 and it should work for
>>> everybody, right?
>>
>> as said before: somebody should do some benchmarking how much gain there
>> is for armv7 with respect to armv8.
>>
> 
> I don't understand because I was talking about *armv6* (Linux-armv6-32) and
> *aarch64* (Linux-arm64-32).

the "as said before" was referring to some other mails years ago.
iirc, something that triggered
   https://lists.puredata.info/pipermail/pd-list/2019-06/125453.html

> 
> You said it yourself that we should use *armv8* for the 32 bit variant
> (Linux-armv8-32), and *aarch64* for this other one. We're also agreeing
> *armv8*/Linux-armv8-32 is pointless. So I guess you mean armv8
> as (Linux-arm64-32) and *aarch64*.

no. i'm pretty sure i meant 32bit arm architectures.
i think the main concern is the speed-boost between armv6 vs armv7.
the latter has (usually) better support for (single precision) floating 
point math, and might give a significant speed gain when doing signal 
processing.

otoh, it might not be able to fully utilize the additional instruction 
set if there's no explicit code for it (as would be typical for 
pd-extenrals)
(see also http://single-boards.com/armv6-vs-armv7/)

that's why i keep mentioning benchmarks.

the armv7 vs armv8 (aarch32!) debate is basically the same, though i 
guess(!) speed improvements might not be as prominent.


> 
> Now, my understanding is that *aarch64* can't run anything else other than
> this... can it run *armv6* and *armv7*?

can you run intel/32bit externals on your intel/64bit mac book? yes
can you run intel/32bit externals within your Pd-intel/64bit on that 
same mac book? no

fgmsard
IOhannes
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