Analyzing ReactOS's code

I will only cite the following piece of code for dessert:

    #define SWAP(a,b,c)  c = a;\
                         a = b;\
                         a = c

http://www.viva64.com/en/a/0076/

>>1
What's wrong with:

inline void Swap(int *a, int *b)
{
    a ^= b;
    b ^= a;
    a ^= b;
}