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2011/2/24 Yura Sokolov <>:
> Well, x64 at the moment uses only 48 bits for addresses.
> 1bit for a sign + 11bits for mantis + 1bit for quiet NaN + 48 bits for an
> address = 61bit
> So that there is 3bits for tagging.
> Currently Lua uses 13 different tag values, so that it would be tricky to
> pack them into three bits :)

If you're willing to pay the price of an extra indirection, you might
be able to get away with using a single tag value for all GC types, as
the GC header stores the tag value.