Hacker News new | ask | show | jobs
by scscsc 2013 days ago
The key here is "it looks like they are equivalent".

In fact, I am not sure they are equivalent (in general, without taking into account the context), and even if they were, proving this would be S.F. for a compiler today (2020). Even coming up with such an optimisation without hardcoding it does not seem plausible.