- some builtins purport to work on simd vectors but actually just unpack the vectors and do their work per-element (e.g. running `@sin()` on a `@Vector(4, f32)` will unpack the vector, run `@sin()` 4 times, and then pack it back into a vector).

- a lot of `std.math` is scalar-only (some functions support vectors, though, and i've got a pr open for one of them and plan to do more).

- i'm certainly missing some intrinsics that i get from xmmintrin.h (rcp, rsqrt, few others).

in general though i'm finding it pretty capable.

mitchell, i know you hang around some of these comments sometimes – i noticed that in ghostty you bring in some c++ libs to do the simd heavy lifting for you. any plans to port that to zig? anything missing from the language or libs that's preventing it?