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UPREDICTABLE instructions

Any idea about instructions marked as UNPREDICTABLE: can it then be UNDEFINED?

In other words: UNDEFINED REQUIRES the instruction to cause UND-exception, but

MAY UNPREDICTABLE do that, or does it have to execute normally except that the result may be whatever?

(I'm not yelling even if I used caps.)

I did as that same thing there Re: ARM/THUMB instructions that change execution path?

but I don't seem to get any answers. And this is probably more appropriate space anyway.

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