On: Rust and C++ on Floating-Point Intensive Code

[vkaku]

Okay, can someone give an explanation for why Rust does not mimic the -O fast behavior? Is this something they plan to add?

[steveklabnik → vkaku]

It leads to undefined behavior in safe code in the general case.

We may add a wrapping type, similar to what we do for integer behavior. But in general, adding flags to change major behavior is not something we do.