if(filter.getPopInt()==0) return false;
    public static boolean isFissable(SIRFilter filter) {	// check that it is stateless	if (!isStateless(filter)) {	    return false;	}	// don't split a filter with a feedbackloop as a parent, just	// as a precaution, since feedbackloops are hard to schedule	// when stuff is blowing up in the body	SIRContainer[] parents = filter.getParents();	for (int i=0; i<parents.length; i++) {	    if (parents[i] instanceof SIRFeedbackLoop) {		return false;	    }	}	// We don't yet support fission of two-stage filters that peek.	if (filter instanceof SIRTwoStageFilter) {	    SIRTwoStageFilter twoStage = (SIRTwoStageFilter)filter;	    if (twoStage.getInitPop()>0) {		return false;	    }	}	return true;    }