public BigFloat getBigZero(boolean sgn) {
		return new BigFloat(effective_frac_size, exp_size, FloatKind.FINITE, sgn ? -1 : +1,
			BigInteger.ZERO, 2 - (1 << (exp_size - 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