The OCaml Journal just published an article about LLVM and HLVM:
"This article describes the changes required to bring HLVM up to date with respect to the new LLVM 2.6 release as well as a new garbage collector design. The previous collector mapped pointers onto their mark state via a hash table. This update uses the more conventional design of placing the mark state in the heap, using a mark-sweep garbage collector to reclaim unreachable values. The new collector is simpler and offers different performance characteristics..."
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