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Author Topic: quickest way to swap byte order on 68000?  (Read 2428 times)

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Offline DamageXTopic starter

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quickest way to swap byte order on 68000?
« on: April 13, 2006, 05:33:05 AM »
Where's that BSWAP instruction when you need it eh? What is the fastest way to change $12345678 into $78563412? (and that's hexadecimal... no financial advice please.)
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Offline Lando

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Re: quickest way to swap byte order on 68000?
« Reply #1 on: April 13, 2006, 05:57:54 AM »
Code: [Select]

move.l  #$12345678,d1
rol.w   #8,d1         ;d1=$12347856
swap    d1            ;d1=$78561234
rol.w   #8,d1         ;d1=$78563412


(ror.w would work too of course)
I don't think there is any quicker way.
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Offline DamageXTopic starter

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Re: quickest way to swap byte order on 68000?
« Reply #2 on: April 14, 2006, 05:01:17 AM »
that's an improvement, thanks
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