>> First doing a rotate can be a bad way to do it, because you first need
>> to clear the carry bit.
>
> Note the use of RLNCF "rotate left no carry".

That only means that the LSB comes from the MSB instead of the C flag.
You still have to deal with the unknown bit value.  Alan's method
essentially does a left shift of 1 and guarantees that the LSB will be
zero in one instruction.


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