Re: Arm questions

On 2021-10-13 11:38, Roland Hughes wrote:
> Thanks!
> 
> I assume I just need to know the Arm Vn as far as your configure goes.
> 
> That means I just have to get specific instructions about configuring
> the container from Toradex.
> 
> If my client allows (they are paying for this work after all) I will
> try to create a write-up that could be added to the site.
> 
> Roland

The "native" compiler option will kick in optimizations and architecture
model that are best for the machine you're building on.  For RPi4, this
is A72 processor.  For Jetson and [I presume your board] this will be
A53 cpu. Late-model GCC will have proper code generation for the 
processor,
and issue optimal code for the one you have.

Needless to say, only select "native" code generation if your end-users
indeed have same cpu architecture as your s/w build machine...

If you're cross-compiling you must set the target-architecture 
explicitly,
of course.  If you can, select 64-bit as it is revealed to be quite a 
bit
faster than 32-bit on Arm.  FOX is not a numerically intensive piece of
code but other things I've tested show about 20% improvement in 64-bit
mode.

  -- JVZ