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Aye, I understand it's an index into an array, but what is the difference between the index i and the return value. Do I have to worry that register values from a TargetRegisterClass could be either zero based or some other base? Are there other methods that rely on zero based in the TargetRegisterClass? I thought register values were "global," but this transformation makes a

The method below takes in a register and returns a register. To me this makes no sense because when I already have a register, why would I need to get it? Could someone please explain the transformation that is happening here? /// getRegister - Return the specified register in the class. /// unsigned getRegister(unsigned i) const { assert(i < getNumRegs() && "Register