Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
XADD Instruction
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  Title:    Exchange and Add                      Flags: O D I T S Z A P C
            80486 Only                                   ═════════════════
                                                         ±       ± ± ± ± ±
  Syntax:   XADD dest,src
 
  See also: .486, ADD, XCHG
 
  Description:
 
     Adds the source and destination operands and stores the sum in the
     destination. The original value of the destination is moved
     simultaneously to the source. The instruction sets flags according
     to the result of the addition.
                                    -♦-