Using bit operations like or and xor is faster than a loop
on all architectures. Really just explicit unrolling.
Similar cast to uint16 unaligned is already done in
other functions here.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Reviewed-by: Andrew Rybchenko <arybchenko@solarflare.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
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