public BigFloat getBigNaN(boolean sgn) {
		return BigFloat.quietNaN(effective_frac_size, exp_size, sgn ? -1 : 1);
	}
Get the minimum finite subnormal {@link BigFloat} value for this format

@return minimum finite subnormal {@link BigFloat} value
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/FloatFormat.java