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> > That is similar to the approach I used, although HLVM provides a pointer directly to the type, saving you a single hop. I'm not so sure that is a very good reason, depending on your implementation data structures that are fundamental to the type system of the virtual machine use custom allocators so the extra hop carries little to no expense. I would not have considered it had I

On Thursday 18 June 2009 12:28:57 Cory Nelson wrote: > I'm also curious what language uses this and why it is useful :) HLVM is intended to be a general-purpose VM rather than a particular language. > Also, things like this would make lock-free algorithms difficult or > impossible. True. Perhaps that is a good argument for providing both kinds. However, nulls are certainly more