State of std::intrinsics::unlikely

1

Hello, I want to ask if std::intrinsics::unlikely is working ?

I hace a C code that has a macro __builtin_expect((x), 0) and greatly improves performance.

Is unlikely working ? If not, any alternatives ?

Thanks !

2

The relevant issue is https://github.com/rust-lang/rust/issues/26179

I think it is stuck at the design/bike shedding phase -- there's no "obviously right" design (or at least it wasn't discovered so far), and it seems like no one is motivated enough to push some specific design to consensus.

3

Not the same but if you're after optimisations of that kind you could also try Profile Guided Optimization.

4

And what abount llvm ?

I tried with PGO but works worse than without this

5

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