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I've implemented Common Lisp using llvm (github.com/drmeister/clasp). I've integrated the Boehm and Memory Pool system garbage collectors. How? It would take a long time to explain - but it's doable.

Nice!

Have you benchmarked against Julia? Would be interesting how Clasp compares in their micro perf tests: https://github.com/JuliaLang/julia/tree/master/test/perf/mic...

http://scilua.org/ was added in the tests recently and does pretty well.

LLVM has a decent amount of documentation on integrating garbage collection, not on how to write one though.

Some more advanced GC integration functionality was added more recently because of the work on Webkit's FTL JIT: http://llvm.org/docs/Statepoints.html

http://journal.stuffwithstuff.com/2013/12/08/babys-first-gar...

I don't know of any general purpose concurrent collectors which have no stop-the-world phase.

What do you mean by that? I have never known a compiler to include a custom garbage collector at all, much less to have such unusual allocation patterns that it would count as a difficult part of the job.