Clearly, you don't know what you are talking about. LLVM can beat V8. As far as I understand, he put LLVM frontend intogether to see the results and it's not the part of the project yet.
I'm not doubting that it can beat V8, in a mature project with very significant programmer time behind it. But I find it very hard to believe that one weekend of fiddling with an LLVM javascript engine is enough to produce results better than V8, which has had the benefit of years of work from some of the smartest minds in the industry.
At what part I said that Its all done over a weekend?
from the post "..Last weekend I could finish the prototype and measure the initial performance of the solution.."
If you still understand that it's all finished over a weekend. No way.. I don't think it is easy to develop a LLVM frontend with those features over a weekend.
If you could have some details on LLVM, you wouldn't accuse me on something you miss read.
Because;
There is no such an LLVM JS engine. LLVM has its own IR and that prototype turns the JS codes into a wrapped LLVM IR.. As a result the final code functions at native level, so it is already fast.
For this reason, 20% or more performance difference because of LLVM actually shows how V8 is fast! It doesn't show the prototype is over a weekend or anything else..