A Neat Bitwise Trick for Swapping Even and Odd Bits

8 bit input? Use a pre-generated lookup table. Store it in ROM.<p>The table deference will take 1 or 2 operations instead of the AND&#x2F;SHIFT&#x2F;PUSH&#x2F;AND&#x2F;SHIFT&#x2F;POP&#x2F;OR described in the answer.