[ww520]

This is a very educational blog post. I knew ‘comptime for’ and ‘inline for’ were comptime related, but didn’t know the difference. The post explains the inline version only knows the length at comptime. I guess it’s for loop unrolling.

[hansvm]

The normal use case for `inline for` is when you have to close over something only known at compile time (like when iterating over the fields of a struct), but when your behavior depends on runtime information (like conditionally assigning data to those fields).

Unrolling as a performance optimization is usually slightly different, typically working in batches rather than unrolling the entire thing, even when the length is known at compile time.

The docs suggest not using `inline` for performance without evidence it helps in your specific usage, largely because the bloated binary is likely to be slower unless you have a good reason to believe your case is special, and also because `inline` _removes_ optimization potential from the compiler rather than adding it (its inlining passes are very, very good, and despite having an extremely good grasp on which things should be inlined I rarely outperform the compiler -- I'm never worse, but the ability to not have to even think about it unless/until I get to the microoptimization phase of a project is liberating).