One of my earliest surprises is: input-only and output-only may be mapped to the same register, and explicitly mapping one of them will not prevent this: https:

One of my earliest surprises is: input-only and output-only may be mapped to the same register, and explicitly mapping one of them will not prevent this: https://godbolt.org/z/bo3r749Ge https://godbolt.org/z/bo3r749Ge