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420 points gnabgib | 1 comments | 15 May 25 21:57 UTC | HN request time: 0.214s | source

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drewg123 ◴[15 May 25 22:47 UTC] No.44000124[source]▶

I tend to be of the opinion that for modern general purpose CPUs in this era, such micro-optimizations are totally unnecessary because modern CPUs are so fast that instructions are almost free.

But do you know what's not free? Memory accesses[1]. So when I'm optimizing things, I focus on making things more cache friendly.

[1] http://gec.di.uminho.pt/discip/minf/ac0102/1000gap_proc-mem_...

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1. adonovan ◴[15 May 25 23:48 UTC] No.44000478[source]▶

>>44000124 #

Quite right. If you use a compiled language (e.g. Go) the difference between the two implementations is indeed negligible.

https://go.dev/play/p/i72xCyhqRkC

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