A nibble table look ahead, just 16 bytes, or 8 if you accept to deal
with 4 bits tables.
For top possible speed at cost of some memory, a 256 bytes look ahead
table.
Wagner

Jim Main wrote:
>
> I'm sure I saw an easy way to reverse a byte some time ago in this list, but
> I've forgotten it..
>
> I want to change   b7 b6 b5 b4 b3 b2 b1 b0   to  b0 b1 b2 b3 b4 b5 b6 b7.
>
> Quickest & most code efficient??
>
> Jim
> ---