Yes. For example in Rust it took a long time for floating point operations to be available at compile time and even now only a subset is. The reason is that a lot of energy and thought went into the issue of producing identical output (and what identical precisely means ) even when compilation is on a different processor than where the target runs.

As far as I know this is not a concern for Zig comptime.

I assumed that it meant that if you ran code at compile time or at runtime, the results should be exactly the same given the same inputs.