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Re:A New Bytecode Format for JavaScriptCore by monocasa on Saturday June 22, 2019 @12:13AM (#20247984)
And compcert has at least seven different IRs, several of which are ASTs. http://compcert.inria.fr/diagram.png

That being said, consistency of internal data structures is probably one of those areas that separates a JIT from an offline compiler. I can see the benefit of switching to a bytecode representation pretty early in that circumstance.

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