Processing method, asynchronous circuit, and logic circuit

A processing method comprising:

• causing a computer to perform first processing for identifying one or a plurality of flip-flop circuits each forming a self-feedback loop from among a plurality of flip-flop circuits in a synchronous circuit, deleting a feedback path in the self-feedback loop, identifying two or more flip-flop circuits forming strongly coupled components from among the one or plurality of flip-flop circuits, and replacing the two or more flip-flop circuits forming the strongly coupled components with one dummy flip-flop circuit;
• and
• causing the computer to perform second processing for alternately performing processing for searching for one or more flip-flop circuits coupled to input side of one or more flip-flop circuits out of the plurality of flip-flop circuits including the dummy flip-flop circuit through a combinational circuit, and processing for searching for one or more flip-flop circuits coupled to output side of the searched one or more flip-flop circuits through the combinational circuit a plurality of times to thereby identify first one or more flip-flop circuits coupled to input side of the combinational circuit and second one or more flip-flop circuits coupled to output side of the combinational circuit.