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Operating System Specific Discussions => Amiga OS => Amiga OS -- Development => Topic started by: DamageX on April 13, 2006, 05:33:05 AM

Title: quickest way to swap byte order on 68000?
Post by: DamageX 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.)

Title: Re: quickest way to swap byte order on 68000?
Post by: Lando 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.

Title: Re: quickest way to swap byte order on 68000?
Post by: DamageX on April 14, 2006, 05:01:17 AM

that's an improvement, thanks