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You can certainly change it. But should you?
(lemmy.ml)
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this post was submitted on 25 Mar 2024
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They do in embedded when you are polling a read only register. The cpu can change the register but writing to it does nothing.
That seems like a better fit for an intrinsic, doesn’t it? If it truly is a register, then referencing it through a (presumably global) variable doesn’t semantically align with its location, and if it’s a special memory location, then it should obviously be referenced through a pointer.