Buechi: identify special cases where reachability is sufficient #1224
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This adds treatment for the special case where all nonaccepting states of the Buechi automaton have an unconditional self-loop. In this case, when these nonaccepting states is reached, the trace cannot be extended to an accepting trace, and will hence be rejected. Hence, in this case, the Buechi acceptance condition is unnecessary, and a simple reachability property is sufficient. Among the 74 tests in regression/ebmc-spot/sva-buechi, only 3 require the Büchi acceptance condition with this change applied.
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tautschnig
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Aug 7, 2025
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This adds treatment for the special case where all nonaccepting states of the Buechi automaton have an unconditional self-loop.
In this case, when these nonaccepting states is reached, the trace cannot be extended to an accepting trace, and will hence be rejected.
Hence, in this case, the Buechi acceptance condition is unnecessary, and a simple reachability property is sufficient.