Is uaddCarry actually working?

[Groovounet]

Just not sure.

[chbaker0]

It appears to give the incorrect carry. I got these results:

4294967291 + 0: 4294967291 1
4294967291 + 1: 4294967292 1
4294967291 + 2: 4294967293 1
4294967291 + 3: 4294967294 1
4294967291 + 4: 4294967295 1
4294967291 + 5: 0 0
4294967291 + 6: 1 0
4294967291 + 7: 2 1
4294967291 + 8: 3 1
4294967291 + 9: 4 1

with this:

#include <iostream>
#include <glm/glm.hpp>
#include <limits>

void test(unsigned int n)
{
    glm::uint a = std::numeric_limits<glm::uint>::max() - 4,
              b = n,
              carry = 0;
    glm::uint result = glm::uaddCarry(a, b, carry);

    std::cout << a << " + " << b << ": " << result << ' ' << carry << std::endl;
}

int main()
{
    for(unsigned int i = 0; i < 10; ++i)
        test(i);
}

This was on the current master branch.