From owner-freebsd-net@FreeBSD.ORG  Wed Aug 22 20:28:48 2012
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Cc: freebsd-hackers@freebsd.org, Mitya <mitya@cabletv.dp.ua>,
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Subject: Re: Replace bcopy() to update ether_addr
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> but wonder whether the same does hold for MIPS/ARM. Getting it wrong
> there will lead to some very very poor performing code.
>
1) do - as already pointed out - standard copy of structure in C.
2) if compiler is found to generate bad code on some archs put assembly.

1 even if compiler is not smart is already far better than calling a 
function to copy 6 bytes that is plain stupid.