For these problems, there are several instructions that are not included in the MIPS instruction set are shown.

The table above contains some instructions not included in the MIPS instruction set and the description of each instruction. Why are these instructions not included in the MIPS instruction set?

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a. subi $t2, $t3, 5 b. rpt $t2, loop #R[rt] R[rs] SignExt Imm #if(R[rs]>0) R[rs]=R[rs]-1, PC-PC+4+BranchAddr