CODEWITHSUNDEEP
iosiphoneipadarmcpu-cache
OMH
OMH

Reputation: 795

What is the cache line size on iPhone and iPad?

What is the cache line size on iPhone and iPad?

And does it vary much between the different devices and CPUs? This is not too easy to find with google.

I need to squeeze some extra performance from my app. :)

Upvotes: 2

Views: 1643

Answers (1)

Notlikethat
Notlikethat

Reputation: 20974

Well, the Cortex-A8 has 64-byte lines, Cortex-A9 has 32-byte lines, as for Swift and Cyclone I don't know - looking at comparable cores (A15, A57, Scorpion, Krait) 32 or 64 bytes seems likely. Either way there's at least 2 different lengths across iOS7 machines.

As you're performance-focused though, remember that benchmarking is infinitely more valuable than theorising - try as many reasonable combinations of code on every piece of hardware you can lay your hands on, go with what's fastest in practice regardless of what 'should' be best.

Upvotes: 2

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