COW2LLVM: The isKnownUniquelyReferenced Deep-Dive

The copy-on-write (a.k.a. CoW or ) optimisation is the quintessential under-the-hood interview question for iOS engineers.

Today, we’re going on a quest to discover how this optimisation really works. I’m taking you on a journey deep into the enigmatic source code of the Swift compiler.

And, of course, I’m going to be referring to copy-on-write as  throughout.

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Tags: COW2LLVM