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It is common to use LSBs in pointers to record state related to a larger data structure but not necessarily of the reference. Some garbage collectors will do this to mark white, black, grey, etc.., for example. On 64-bit machines regarding references to objects, there are typically 3 lsb's to work with, on 32-bit machines, 2 lsb's to work with. On 64-bit ...


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