Phil Karn karn at
Sun Feb 21 15:02:12 PST 1993

A bit count instruction would be very handy in a project I've been
working on lately, which is a new packet radio link level protocol
for amateur packet radio. This protocol uses forward error correction,
so it needs a highly reliable way to delimit the start of each
physical link frame. A pseudo-random "sync" sequence is the standard
way to do this, and you detect it with a correlator. The bit count
instruction would come in handy here, since the only other fast
way to do it is to use table lookup.


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