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< void printReg(std::ostream &os, int reg) const;
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> void printIntReg(std::ostream &os, RegIndex reg_idx) const;
> void printFloatReg(std::ostream &os, RegIndex reg_idx) const;
> void printCCReg(std::ostream &os, RegIndex reg_idx) const;
> void printMiscReg(std::ostream &os, RegIndex reg_idx) const;