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Return value of xchg instruction is_____________

1.  Old value

2.  New value

3 . 1 if operation succeeds and 0 if operation fails

4. None of the above
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A) Old value

SYNTAX is xchg(Oldvalue , New Value) . When the xchg is executed the old value is exchanged with  new value

and in return you get oldvalue . Then only the instruction is executed Sucessfully .

This instruction is used in Intel Processor :)
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