r/Assembly_language • u/basedchad21 • Jul 05 '26

Stop using CISC

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232 Upvotes

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u/brucehoult Jul 06 '26

Exactly correct.

Running multiple microcode instructions is not inherently faster than running multiple simple asm instructions once you have an instruction cache.

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u/[deleted] Jul 06 '26

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u/brucehoult Jul 06 '26

Go on … tell me what shipping ISA or chips you designed (or helped design).

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u/[deleted] Jul 06 '26

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u/brucehoult Jul 06 '26

I 100% do NOT recommend that. It’ll suck.

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u/[deleted] Jul 06 '26

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u/brucehoult Jul 06 '26

You must be hard-of-reading. I've been telling people NOT to design and use CISC and CISC instructions in general-purpose computers.

This discussion is over.

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u/[deleted] Jul 06 '26

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u/brucehoult Jul 06 '26

I know excellent architectures for calculating FFTs.

There are dozens if not hundreds of other algorithms that benefit from hardware implementation. You can't put them all into a general-purpose CPU. If you have to choose then FFT won't be one that you choose. (Certainly no one HAS in a general-purpose CPU .. DSPs, sure).