* The QCVM itself lacks a BITXOR instruction. Thus emulating
* the mathematics of it is required. The following equation
* is used: (LHS | RHS) & ~(LHS & RHS). However, due to the
* QCVM also lacking a BITNEG instruction, we need to emulate
* ~FOO with -1 - FOO, the whole process becoming this nicely
* crafted expression: (LHS | RHS) & (-1 - (LHS & RHS)).
* The QCVM itself lacks a BITXOR instruction. Thus emulating
* the mathematics of it is required. The following equation
* is used: (LHS | RHS) & ~(LHS & RHS). However, due to the
* QCVM also lacking a BITNEG instruction, we need to emulate
* ~FOO with -1 - FOO, the whole process becoming this nicely
* crafted expression: (LHS | RHS) & (-1 - (LHS & RHS)).