It gives an unexpected result while doing xor operation on a templated class.

For sample, here is my simple code:
------------------------------------------------------
#include <iostream>

using namespace std;

template
<class T>
inline void XOR-Swap(T &a, T &b)
{
        if (a != b)
        a ^= b ^= a ^= b;
};

int main()
{
        int a = 10;
        int b = -3;
        XOR-Swap(a, b);

        cout << a << endl;
        cout << b << endl;

        return 0;
}
-----------------------------------------------------
Results:

1. with "-O0": Incorrect
-------------------
0
10
-------------------


2. with "-O1": Correct
-------------------
-3
10
-------------------


Any comment?