Reversible Logic Synthesis Benchmarks Page

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Function rd32 (.pla file) has 3 inputs and 2 outputs. Its ouput is binary representation of the number of 1s in its input.
Picture Machine-readable version Model Garbage Gate count Quantum cost Author(s) Date
here here NCT 2* 4* 8 Feynman (source) 1986
* - the number was shown to be minimal