Signed Addition Functionality True sum requires w+l bits Drop off msB Treat remaining bits as 2s comp. integer u+v-2", TMax <u+v(PosOver) Tadd (u, v) 1+V,TMin,≤l+v≤Mamx P70(2.12) u+v+2, u+v<TMin(NegOver PosOver: Positive Overflow NegOver: Negative Overflow8 Signed Addition • Functionality – True sum requires w+1 bits – Drop off MSB – Treat remaining bits as 2’s comp. integer      + + +  +  +  + −  + = 2 , ( ) , 2 , ( ) ( , ) u v u v TMin NegOver u v TMin u v TMax u v TMax u v PosOver Tadd u v w w w w w w PosOver：Positive Overflow NegOver：Negative Overflow P70 （2.12）