But, JIT vs. AoT is a false dichotomy. Given light-weight enough profiling utilizing cooperation between hardware designers and compiler writers, one could hav

But, JIT vs. AoT is a false dichotomy. Given light-weight enough profiling utilizing cooperation between hardware designers and compiler writers, one could have AoT with feedback-guided optimization and link-time optimization, and still have just-in-time re-optimization. Concretely, I think you'd want hardware that supported reservoir sampling of where CPU cycles are spent, sampling of which branches are mispredicted, and which code locations are causing cache misses. You'd also want lightweight hardware recording of execution traces.