private long extractFractionalCode(long x) {
		long mask = (1L << frac_size) - 1;
		x >>>= frac_pos; // Eliminate bits below
		return 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