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This is the R.O.M.E.68000 Manual version 0.51.
This is an experimental version.
Copyright © 1997 by G. Mezzetti; last update: January 1, 1999.

Ordinary Instructions of the ``Control'' Class

ConFront PoinTers

Mnemonic:

CFPT

Operands:

A,B

Oper.	Addressing Group	Op. Use	Mult. Op.
A	dadr	d	-
B	dadr	e	-

Instruction Key:

1E

Formal Description:

(B + @(B)) - (A + @(A)) --> B.
   {Subtract the address of the location pointed at by A}
   {from the address of the location pointed at by B;}
   {puts in B the offset obtained in this way.}

Informal Description

This instructions calculates the offset (as an integer modulus 65536) of the two locations pointed at by its operands (the order is B - A), and puts it in B. Note that the pointer initially found in B is overwritten, so it should be a copy that you created previously, for instance with MVPT.

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