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GARTHWILSON
PostPosted: Sat Apr 17, 2021 11:44 pm 
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Joined: Fri Aug 30, 2002 1:09 am
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Location: Southern California
BillG wrote:
Don't the other methods also need to do the "AND $0F"?

Also, if we do both nybbles in a byte, the cost of the table is only an additional 8 bytes per instance.

And don't forget the efficient nybble swap at http://6502.org/source/general/SWN.html, only 8 bytes and 12 clock cycles, and no variables, no stack usage, no look-up table, no X or Y usage. It uses only the accumulator and status register.

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