evranch , 5 months ago

I tried using AI tools to do some cleanup and refactoring of some legacy embedded C code and was curious if it could do any optimization or knew any clever algorithms.

It’s pretty good at figuring out the function of the code and adding comments, it did some decent refactoring of some sections to make them more readable.

It has no clue about how to work in a resource constrained environment or about the main concepts that separate embedded from everything else. Namely that it has to be able to run “forever”, operate in realtime on a constant flow of sensor data, and that nobody else is taking care of your memory management.

It even explained to me that we could do input filtering by using big arrays to do simple averaging on a device with only 1kB RAM, or use a long long for a never-reset accumulator without worrying about what will happen because “it will be years before it overflows”.

AI buddy, some of these units have run for decades without a power cycle. If lazy coders start dumping AI output into embedded systems the whole world is going to get a lot more glitchy.