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The SBCL thing makes me wonder if there are any modern lisps that can be restricted to a 4GB (32-bit) address space, while still using 64-bit values and registers...

Then, cons cells would take up only one machine word.

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If everything you point to is aligned on an eight-byte boundary, and if you don't use type tags, then a 32-bit pointer can point to anything in a 35-bit address space. So you can get up to 32 GB.

"16384 PB ought to be enough for everybody!"

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