Zero-detecting ALU

Binert

Zero

If all output bits are zero, the OR is false, so its negation is true.

Testing for alternative representations?

OF indicator

•

•

•

Op

a0

b0

result0

Cin

Cout

ALU0

a1

b1

result1

Cin

Cout

ALU1

a2

b2

result2

Cin

Cout

ALU2

result31

Cin

Cout

ALU31

a31

b31

Binvert

0

0

0

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