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Selective-complement

The selective-complement operation complements bits in A where there are corresponding l's in B. It does not affect bit positions that have O's in B. For example:

1010 A before

1100 B (logic operand)

0110 A after

Again the two leftmost bits of B are l's, so the corresponding bits of A are complemented. This example again can serve as a truth table from which one can deduce that the selective-complement operation is just an exclusive-OR microoperation. Therefore, the exclusive-OR microoperation can be used to selectively complement bits of a register.

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