public long opInt2Float(long a, int sizein) {
		long ival = a;
		ival = Utils.zzz_sign_extend(ival, 8 * sizein - 1);
		double val = ival; // Convert integer to float
		return getEncoding(val);
	}
Construct SmallFloat Data. (similar to BigFloat)

@param fracbits number of fractional bits (positive non-zero value; includes additional
           implied bit if relavent).
@param expbits maximum number of bits in exponent
@param kind the Kind, FINITE, INFINITE, ...
@param sign +1 or -1
@param unscaled the value's mantissa
@param scale value's scale
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/FloatFormat.java