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Olin Shivers, ‘History of T’:

Maclisp on the [PDP]-10 had used a mark&sweep GC (one version of which famously "ran in the register set," though that is another story)

This implies, in my interpretation, that the garbage collector used no storage other than the registers of the machine. Is my understanding of this correct, and if so, how did it achieve this efficiently? Was a paper ever published on its implementation?

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