A Neat Bitwise Trick for Swapping Even and Odd Bits(dailycodingproblem.com) |
A Neat Bitwise Trick for Swapping Even and Odd Bits(dailycodingproblem.com) |
The table deference will take 1 or 2 operations instead of the AND/SHIFT/PUSH/AND/SHIFT/POP/OR described in the answer.
This trick will work for any number of bits though. You might not want to use 2^64 entries in your table.
And the "trick" given in the answer still depends on a fixed number of input bits, no matter if it's 8, 32, or 10^100.