Overflow Rules

1. If N₁Signbit == N₂Signbit

&

R_Signbit != Carry_Bit

then

Overflow_Bit = 1

2. If N₁Signbit == N₂Signbit

&

R_Signbit == Carry_Bit

then

Overflow_Bit = 0

3. If N₁Signbit != N₂Signbit

then

Overflow_Bit = 0