[kscarlet]

> As to the actual difference between JIT vs. AOT... it may just come down to accounting. That is, on whether you can always exclude the compilation time/cost from the overall program execution time/cost or not. If so, you're compiling ahead of (execution) time. If not, you're compiling during execution time.

Well, this includes what I refer to as "on-the-fly" AOT, like SBCL, CCL, Chez Scheme... Even ECL can be configured to work this way. As I mentioned in another comment, people in those circles do not refer to these as "JIT" at all, instead saying "I wish my implementation was JIT instead of on-the-fly AOT"!