Toot

Written by Isaac Ji Kuo on 2024-11-20 at 13:50

I had a fun discussion on 6502 code optimization, for a port of Elevator Action.

Basically, you have to look at loops in a different way, because a lot of things that are practically "for free" even on slightly more modern CPUs just ... aren't ... on a 6502.

Like, the intuitive idea of incrementing an address while looping. No, it's actually faster to keep X or Y index constant and precalculate different offsets. Weird.

https://www.lemon64.com/forum/viewtopic.php?t=83093&start=270

[#]Retrocomputing #6502 #C64

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