[masklinn]

Happens from time to time, I’ve seen folks going around libraries looking for “perf unsafe” and benching if removing the unsafe actually lowered performances.

One issue on that front is a question of reliability / consistency: on a small benchmark chances are the compiler will always trigger to its full potential because there’s relatively little code, codegen could be dodgier in a context where code is more complicated or larger.

Then again the impact of the bounds check would also likely be lower on the non-trivial code (on the other hand there are also threshold effects, like branch predictor slots, icache sizes, …).