> Well, if we're going in that direction anyway: 
> Why not include all possible assembler instructions then ?

Because some of them are not designed for calculations. But ror/rol are.

> Let's be serious. You must draw the line somewhere.
> I think these instructions are so exotic, they are pollution of the system 
> unit.
> Michael.

They are widely used in encryption/decryption algorithms. Unfortunately, I 
don't really know why they were introduced in 8086 assembler.
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