How would implement in the assembler a logical-shift-left

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The NIOS-II instruction set includes several shift instructions. They include logical-shiftleft, logical-shift-right,and arithmetic-shift-right. Other architectures only provide an arithmeticshift- right instruction.

a) Why doesn't NIOS-II offer an .arithmetic-shift-left. opcode?

b) How would you implement in the assembler a logical-shift-left(LSL) pseudo-operation for a machine that didn.t have this particular instruction? Be sure your LSL instruction can shift up to W-bits where W is the machine word size in bits.

Reference no: EM13290188

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