How to swap two __m128i variables in C++03 given its an opaque type and an array?

Question

What is the best practice for swapping __m128i variables?

The background is a compile error under Sun Studio 12.2, which is a C++03 compiler. __m1

Answer 1

swap via memcpy?

#include 
#include 

template
void memswap(T& a, T& b)
{
    T t;
    std::memcpy(&t, &a, sizeof(t));
    std::memcpy(&a, &b, sizeof(t));
    std::memcpy(&b, &t, sizeof(t));
}

int main() {
    __m128i x;
    __m128i y;
    memswap(x, y);
    return 0;
}