Chapter 2, Problem 2.25.1E

Program Plan Intro

I-Type instruction:

• When the instruction must operates on a register value and an immediate value that time I instruction is used.
• I-type instruction is used by the load, store, branch and immediate instructions.

op

rs

rt

address

       6 bits       5 bits         5 bits              16 bits

Where,

op – it is an opcode used to selects a particular operation.

rs and rt – are the first and second source registers.

address – it is a 16 bits signed 2’s complement value.

Given statement:

rpt $t2, loop #if (R [rs] = R [rs] > 0) R[rs] = R[rs]-1, PC = PC + 4 +BranchAddr

Explanation:

Here “rpt” is a repeat instruction that used to tests a counter value, subtracts one from the counter then finally branches to the label “loop”.