Yes, it's sortof tautologically true that if you generate the optimized code during initial codegen then optimization wouldn't optimize. No, that's not really

Yes, it's sortof tautologically true that if you generate the optimized code during initial codegen then optimization wouldn't optimize. No, that's not really how we build compilers. I guess you're trying to get is what structures make it easier to defer the optimal code generation. And I think that's somewhat a hard answer since it generally has many answers.