Overflow flag & Carry flag

王朝other·作者佚名  2006-01-09
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Two of the bits in the FLAGS register that add and sub instructions set are overflow and carry flag:

Overflow flag:

Set for signed arithmetic when the ture result is too big to fit into the destination.

Carry flag:

If there is a carry in the MSB of an addition or a borrow in the MSB of a subtraction, the carry flag is set. Thus, it can be used to detect overflow for unsigned arithmetic.

 
 
 
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