Incorrect ABI when calling into C++ with bindgen on Windows

[hystericfleece]

I have a simple .cpp file which I give to bindgen:

class __declspec(dllexport) Wrapped
{
public:
     __declspec(noinline) Wrapped(float x, float y, float z, float w, float r):
        data()
    {
        data[0] = x;
        data[1] = y;
        data[2] = z;
        data[3] = w;
        data[4] = r;
    }

    __declspec(noinline) Wrapped getReversed() const
    {
        return Wrapped(
            data[4],
            data[3],
            data[2],
            data[1],
            data[0]
        );
    }

private:
    float data[5];
};

And the bindings it generates seem correct! However, when I try to call getReversed function, Rust for some reason passes a pointer to the result in rcx, while the pointer to a this struct is passed in rdx, while C++ is actually uses them in the reversed order! So this member function will overwrite the actual input with garbage it got out from rdx pointer.

Am I doing something incorrect? Would be glad for any help!

Here is a complete example: https://github.com/hystericfleece/rust-cpp-abi/tree/main
Also I started a discussion on Discourse: https://users.rust-lang.org/t/not-matching-abi-between-c-and-rust/112791