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Right now they're disabled, pending patches on the LLVM side. You can keep track here: https://github.com/rust-lang/rust/issues/54878

I don't know the current state, but I hang out in the Zulip room dedicated to the work on the optimizations

- https://rust-lang.zulipchat.com/#narrow/stream/189540-t-comp...

Yes, Rust has the potential to be faster than C, or even C++. But the compilers' implementations of such optimizations are far too buggy to turn on.

All the usual caveats apply, but benchmark game has rusts median already better than c++, but not as good as c. They are all so close that performance shouldn't really be a consideration between them I think. You can see g++ vs clang++ now too.

They’re not on right now.