memcpy_cpu on 64bit arm

Hello,

Is there any particular reason why it is empty? My rect copy to fb in riscos uses neon. It is a speed gain of about 40% compared to word/long word copy from c. But I don't know how much it affects Genode.

It seems like it ends up in /* eight bytes chunks */ but isn't that a byte copy?

I have the feeling that in my case, with blit,mem copy without crop is faster than doing it with crop every time. Ram, accesses are proved to be very fast on this hardware. The extra cycles for cropping might be a bottleneck. Combined with a neon run through , testing and copying without leaving routine could probably make a big performance gain.

But.

I am happy, as always, to be proved wrong!

Michael