The flags such as carry flag, overflow flag and zero flag.
2.
For example, jz uses the zero flag, jc uses the carry flag and jo uses the overflow flag.
3.
This is in contrast to the overflow flag which provides a mechanism for comparing the values as signed integer values.
4.
The overflow flag would then be set so the program can be aware of the problem and mitigate this or signal an error.
5.
The overflow flag is typically changed by all arithmetic operations, including compare instructions ( equivalent to a subtract instruction without storing the result ).
6.
For both instructions, the Parity / Overflow flag ( bit 2 ) is set according to the current state of the IFF2 flip-flop.
7.
The SO pin, on 6500 family CPUs that have it, sets the Overflow flag in the P register, which can be tested using BVC / BVS instructions.
8.
Internally, the overflow flag is usually generated by an exclusive or of the internal carry " into " and " out of " the sign bit.
9.
Along with a carry flag, a sign flag and an overflow flag, the zero flag is used to check the result of an arithmetic operation, including bitwise logical instructions.
10.
Some processors support a hardware overflow flag that can generate an exception on the occurrence of an overflow, but it is usually too late to salvage the proper result at this point.
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