Section 02 Part 04 – The EXG Instruction

“All the gold which is under or upon the earth is not enough to give in exchange for virtue.” ~Plato

Introduction

EXG – EXchanGe registers

This instruction will swap the long-word of a data or address register with another data or address register.

Examples

exg.l d0,d1

• if d0 = 00000000 and d1 = 11111111, after the instruction d0 = 11111111 and d1 = 00000000
• if d0 = 01234567 and d1 = FFEEDDCC, after the instruction d0 = FFEEDDCC and d1 = 01234567
• if d0 = ABCB9989 and d1 = 00000100, after the instruction d0 = 00000100 and d1 = ABCB9989

And that is pretty much it, it’s as simple as the “swap” instruction. You can also do this with address registers:

exg.l a0,a1

exg.l d4,a6

exg.l a2,d2

This instruction can only exchange long-words between registers, word and byte exchange is not available.

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