prism.ECComputerDefault: use JDD.isSingleton instead of GetNumMinterms to check for singleton state set

Using isSingleton should be more efficent.


git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11992 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/ECComputerDefault.java

@@ -111,7 +111,7 @@ public class ECComputerDefault extends ECComputer
 				continue;
 			}
 
-			if (stableSet.equals(candidate) && JDD.GetNumMinterms(stableSet, allDDRowVars.n()) == 1) {
+			if (stableSet.equals(candidate) && JDD.isSingleton(stableSet, allDDRowVars)) {
 				mecs.add(candidate);
 				JDD.Deref(stableSet);
 				continue;