Generic swap: Difference between revisions

=={{header|68000 Assembly}}==

Two registers can be swapped with <code>EXG</code>:

<lang 68000devpac>EXG D0,D1 ;swap the contents of D0 and D1

EXG A0,A1 ;swap the contents of A0 and A1</lang>

However, these commands cannot be used with memory. If you want to do that you'll need to use the stack or a data register.

<lang 68000devpac>MOVE.L ($00FF0000),D0

MOVE.L ($00FF1000),D1

MOVE.L D0,($00FF1000)

MOVE.L D1,($00FF0000)</lang>

The <code>SWAP</code> switches the high and low words of a data register. It can't be used with memory either.

<lang 68000devpac>MOVE.L #$1234ABCD,D0

SWAP D0 ;now D0 = #$ABCD1234</lang>