InterlockedCompareExchange16.c

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UINT16
EFIAPI
InternalSyncCompareExchange16 (
  IN      volatile UINT16  *Value,
  IN      UINT16           CompareValue,
  IN      UINT16           ExchangeValue
  )
{
  _asm {
    mov     ecx, Value
    mov     ax, CompareValue
    mov     dx, ExchangeValue
    lock    cmpxchg [ecx], dx
  }
}