Section 02 Part 03 – The SWAP Instruction

“People say to me, Would you like to swap your life with me for 24 hours? Your life must be very strange. But of course I have not experienced any other life. It's not strange to me.” ~Prince Andrew

Introduction

SWAP – SWAP register halves

This instruction will swap the upper word with the lower word of a data register.

Examples

Say data register “d0” contains 2222EEEE, after this instruction

swap d0

Data register “d0” will contain EEEE2222. And as you can probably tell, the upper word “2222” has been swapped over with the lower word “EEEE”.

Here are a few more examples:

• if d0 started with 01234567, after the instruction d0 will contain 45670123
• if d0 started with FFEEDDCC, after the instruction d0 will contain DDCCFFEE
• if d0 started with 00F00299, after the instruction d0 will contain 029900F0

It is pretty straight forward, nothing more. This instruction will only work on data registers, it will not work for address registers, or memory, or anything else.

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