Is there a doc page for the import("builtin") type/module?

[Sze]

There is the --show-builtin option that allows you to look at the contents of import("builtin"):

How to check if Target supports various instructions, avx512f

You can access the current cpu from builtin.cpu const builtin = @import("builtin"); const cpu: std.Target.Cpu = builtin.cpu; _ = cpu.features; cpu.features is a list with all the features. Use zig build-exe --show-builtin or zig build-exe --show-builtin -target aarch64-linux-musl to view all the builtin declarations with values for the current target.