private String formatSpecialCase() {
		if (isNaN()) {
			return NAN;
		}
		if (isInfinite()) {
			return sign < 0 ? NEGATIVE_INFINITY : POSITIVE_INFINITY;
		}
		if (isZero()) {
			return sign < 0 ? "-0.0" : "0.0";
		}
		return null;
	}
Round this value to the nearest whole number
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/BigFloat.java