And, then in theory, restoring the thread when the requested registers become available. But is the spilling/restoring registers hardware something that would

And, then in theory, restoring the thread when the requested registers become available. But is the spilling/restoring registers hardware something that would see much other use? In some code hardware accelerated stack management can be a real advantage. In other code its just not flexible enough to make sense. And in some function calls are rare enough to make it not worth the investment. I sort of expect that more code running on a GPU is in the third category but I could image that I'm wrong and that it would be in the first. But if not the investment in those mechanisms might not be worth it.