memcpy_cpu on 64bit arm

[Norman Feske]

Hi Michael,

> About the blitting:
> I will do benchmarks with and without clipping/flushing.

for such microbenchmarking, let me point you to the GENODE_LOG_TSC 
utility [1], which makes this dead easy.

[1] https://genodians.org/nfeske/2021-04-07-performance

Cheers
Norman

-- 
Dr.-Ing. Norman Feske
Genode Labs

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