It will end up spitting out something like:

%x = callattrCapi()
Py_XDECREF(x)
if (!x) throwCapiException()

We usually write something more like:

%x = callattrCapi()
if (!x) throwCapiException()
Py_DECREF(x)

But with optimizations turned on, llvm will turn them into
the same thing.