The above while can be slow if not the complier manages to turn into:

But the compiler is able, and Wolfgang already told that in another thread. Yes, I checked my assembly. No, not all platforms and all versions. like Wolfgang.

I think you may have a point, but unless you have a measured misworking case to show, we'd better stop here.

/alessandro, who'll lift linux/arch/arm/lib/memcpy.S next time