[xscott]

I can see your enthusiasm for Rust, but my comment was more directed to whether criticisms of UB in C can be taken seriously considering suggestions to remove it where possible have almost always been shot down in the name of speed.

> I think there are some cases where rust is missing out on optimizations though, like with signed int overflow for example

Before you push for UB in safe Rust, I politely suggest you write your own benchmark for this in C or C++. Try a few combinations of { signed, unsigned } X { 32 bit, 64 bit } X { gcc, clang }, compiled at -O2 or higher, and see what you get for results. Maybe throw in -fwrapv for some of the runs. My own conclusion on my own benchmarks is that UB advocates are mostly wrong.