Re: Does ARMEL toolchain include NEON support?
On Thu, Feb 28, 2019 at 09:05:04AM +0000, Ian Campbell wrote:
>On Wed, 2019-02-27 at 23:45 +0000, Steve McIntyre wrote:
>>
>> So this is a place where the world is just *different* compared to x86
>> - the different versions of the ARM architectures have signficantly
>> different capabilities. If you're looking to build something that
>> performs well on a modern v7 CPU, compilling for v5 is a
>> mistake. You'll be using the wrong locking primitives, barriers,
>> etc. Equally, the features you're going to be looking for (like SMP,
>> NEON) just don't make sense / don't exist on v5 CPUs.
>
>To spell it out: the gist of this is that it isn't possible to provide
>a single arm binary which works well for both armel and armhf (which I
>think is what Jeff is trying/wants to do?).
>
>The advice here is to instead ship[0] two binaries -- one targetting v5
>(no neon etc, aka armel in Debian) and another targetting v7 (w/
>possible(? I forget what is optional) neon and other stuff aka armhf in
>Debian and other distros).
Yep.
--
Steve McIntyre, Cambridge, UK. steve@einval.com
"I've only once written 'SQL is my bitch' in a comment. But that code
is in use on a military site..." -- Simon Booth
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