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(nasm.info)Section B.4.331

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B.4.331. `XADD': Exchange and Add
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     XADD r/m8,reg8                ; 0F C0 /r             [486]
     XADD r/m16,reg16              ; o16 0F C1 /r         [486]
     XADD r/m32,reg32              ; o32 0F C1 /r         [486]

   `XADD' exchanges the values in its two operands, and then adds them
together and writes the result into the destination (first) operand.
This instruction can be used with a `LOCK' prefix for multi-processor
synchronisation purposes.