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To use LLVM to achieve the same thing would be to find a way to bootstrap SBCL through LLVM, which would, again, be very cool.

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There are occasional discussions on sbcl-devel about it, but I'm not aware of anyone committing serious resources to it (it's not really a weekend-project, or even single-GSoC-student, amount of work). There is also some skepticism about whether it's worth doing at all, because of worries that it will be difficult to get good GC performance out of LLVM: http://marc.info/?l=sbcl-devel&m=136219729420475&w=2

(Reference [1] in that email points to: https://github.com/elliottslaughter/rust-gc-notes, which documents difficulties trying to build a precise GC for Rust on top of LLVM.)

Simply doing a correct precise GC with LLVM is still a work in progress: http://www.philipreames.com/Blog/

Taking GC seriously in the design of a low-level compiler-target language was one of the aspects that I found very interesting about the C-- project of Simon Peyton Jones & Norman Ramsey. But it unfortunately didn't get anywhere near the same backing/momentum as LLVM, and now seems defunct.

Indeed, and I found the whole concept to be excellent.

Unfortunately, as far as I can tell, it's defunct outside of its use in the GHC. E.g. the Quick C-- compiler was recently archived here https://github.com/nrnrnr/qc--

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