private int extractExponentCode(long x) {
		x >>>= exp_pos;
		long mask = (1L << exp_size) - 1;
		return (int) (x & mask);
	}
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