Sure, performance is more interesting, but it's significantly harder. With code size, you just need to run the code through the compiler and you have a determi

Sure, performance is more interesting, but it's significantly harder. With code size, you just need to run the code through the compiler and you have a deterministic measurement for evaluation. Performance has no such metric. Benchmarks are expensive and noisy. Cost models seem like a promising direction, but they aren't really there yet.