I have more faith in the evolution of rust than C++. C++ has a lot of backward compatibility pressure with large large companies. Rust is new and is already quite a good language.

Don't really need SIMD intrinsics or a new rust program. There are some bugs that have been resolved in the new llvm that allow better auto vectorization. Nightly rust let's you turn them on now I thinj, I'll have to go run it again and see how it does. So a rebuild is all that is necessary. Also using autovec instead of intrinsics makes it more portable. For instance when I rebuilt the leading rust n-body and the leading c n-body rust won. That is because my machine had avx and llvm was already doing enough autovec to make it faster than the old intrinsics the c version had hardcoded. The machine for the game does not have avx. Even on the same hardware autovec can be fast. The winner is FORTRAN for n-body and it uses autovec not intrinsics. Ifort is an Intel only compiler, but at least from atoms to the newest it will always compile and be fast. It took advantage of my avx and still beat rust for instance. Also the c and c++ n-body cheat by using a single precision float for the inverse square so they can use the intrinsic for that. The output isn't checked to enough precision to make it matter but it is still counter to the spirit of the benchmark.