private static byte xor(byte rmv, byte lmv) {
		// See truth table for XOR above
		if ((lmv & 2) == 0 || (rmv & 2) == 0) {
			return 0;
		}
		return (byte) ((lmv ^ rmv) | 2);
	}
Compute the arithmetic difference: this masked long minus another

@param that the other masked long.
@return the result.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/expr/MaskedLong.java