Here's just some of the substantial differences between memory and register operands:
I am talking about having memory-backed register file. It still may be that the things you're mentioning are a problem, but I'm not sure I understand exactly why they would be a problem from the (Twitter-limited) explanation.
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Another way to say it would be, I am asking why we don't memory map registers the way we memory map files, for the same reasons (so the _processor_ knows where they would go when they need to be swapped out).
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Maybe you can't _actually_ ever make that work in any kind of efficient way that isn't worse than just using explicit save and restore on thread switches, but I'm not sure I get why.
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