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Discussed here: https://news.ycombinator.com/item?id=42186507

> We implement LuaJIT Remake (LJR), a standard-compliant Lua 5.1 VM, using Deegen. Across 44 benchmarks, LJR's interpreter is on average 179% faster than the official PUC Lua interpreter, and 31% faster than LuaJIT's interpreter. LJR's baseline JIT has negligible startup delay, and its execution performance is on average 360% faster than PUC Lua and only 33% slower (but faster on 13/44 benchmarks) than LuaJIT's optimizing JIT.

presentation by the author

Deegen: A LLVM-based Compiler-Compiler for Dynamic Languages https://www.youtube.com/watch?v=5cAUX9QPj4Y

Slides https://aha.stanford.edu/sites/g/files/sbiybj20066/files/med...

Ongoing work documented here https://sillycross.github.io/ and some comments here https://lobste.rs/s/ftsowh/building_baseline_jit_for_lua

https://github.com/luajit-remake/luajit-remake

Very cool! Taking copy and patch to its natural conclusion

I wonder if this would work for python.

It is very exciting to get a multi-tier VM from just bytecode encoded version of VM spec.

If this can generate a v8/spidermonkey class engine for new scripting languages that would be incredible.

I’m gonna need you to take about 15% off the top there, Squirelly Dan.

Wish they tried it with Ruby. Which is known to be extremely hard to optimise.