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llvm skips it entirely.

It can easily be proven for all valid values of int (of a specific limited size).

What's the most pointless compiler optimization you're aware of?

(Obviously a subjective question in practice, so chances are you might need to add a bit of qualification)

Infinite loops are considered undefined behaviour in C++.

Infinite loops are undefined (actually, undecidable) behaviour in any Turing machine.

That's not what undefined behavior means.

Surely it's true for every unsigned 64-bit integer.