MIPS Shift Instruction

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In an sll instruction in MIPS, it can only take 5-bits. How would the shift work if the shift amount was more than 31? How do we represent that with 5-bits?

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You cannot. SLL is only for 32-bit values, where shifting more than 31 places makes no sense. Use DSLL/DSLL32 or DSLLV for 64-bit values.