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Because registers on x86 and RISC-V are different, you still need to have a register file to map those, no?

Only for binary translation or just-in-time compilation (basically producing native code). If you're interpreting RISC-V you can just pretend the registers are an array of register-sized integers. Which is what they are.

>registers are an array of register-sized integers

A "register file" is the name of such an array.

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