[bjourne]

Using the nightly builds of any programming language in production is insane. That's why we call it FutureRust to differentiate it from what is production ready Rust.

That Rust might have SIMD intrinsics in the future matters little to people trying to seriously use Rust today. And in several benchmarks C handily beats Rust even without intrinsics. Such as the fannkuch-redux one where it is about 2x faster.

[Manishearth]

Don't use the latest nightly then. Use the nightly from 4 months ago that corresponds to today's stable, ensuring that it doesn't have any extra soundness patches that need backporting. Usually the case.

I don't see "several", I just see one. Most of the non-simd benchmarks have almost exactly the same numbers for Rust and C. Perhaps the Rust test for fannkuch isn't optimized yet (looks like the C one has some extra logic about how to split up the chunks, whereas Rust blindly parallelizes)? I already optimized one Rust program, I'm not going to sit and optimize every benchmark out there -- we have tons of counterexamples of fast benchmarks already. It seems like you won't agree as long as one nonoptimized benchmark exists. In that case, good day to you. I'm done here.