there are aspects of Rust that are easier for llvm to optimize with than c. there are things rust isn't yet doing that it will do to make llvm be able to optimize it better as well.
the primary reason THIS code didn't optimize as well is that you can't pass ffast-math to llvm from rust in any useful way (yet)
the primary reason THIS code didn't optimize as well is that you can't pass ffast-math to llvm from rust in any useful way (yet)