Why a reversible program needs a history of its own steps to run backwards

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Garbage collection is computational irreversibility made explicit Fredkin's conservative logic keeps the number of ones constant through every gate CMOS already runs close enough to Landauer that further voltage scaling stalls Nobody has built a general-purpose reversible CPU and the memory bill is why Adiabatic circuits recover charge instead of dumping it and only win at low frequency Reversible logic does not mean zero heat: interconnect and clocking still burn watts What physics means by time reversible is not what a reversible gate means A Toffoli gate can compute anything but it has to keep its garbage bits Landauer's principle puts a floor on erasure at kT ln 2 per bit Bennett's trick makes any computation reversible by uncomputing instead of erasing

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