I believe the bounds check, in particular, is devastating for autovectorization. There are ways around it, but it requires additional code in safe rust. Edit:

I believe the bounds check, in particular, is devastating for autovectorization. There are ways around it, but it requires additional code in safe rust. Edit: actually looks like autovectorization is in play here [1]. Doesn't look like the bounds check gets in the way at all. [1] https://godbolt.org/z/af4qGba5o https://godbolt.org/z/af4qGba5o