J-type

JALR (I-Format)

  • JALR rd, rs1, imm

    • Reg[rd] <- PC + 4; PC <- Reg[rs1] + imm;

      • Write PC + 4 to Reg[rd] (return address)

      • Sets PC = Reg[rs1] + offset

Adding JALR to datapath

JAL

  • JAL rd, imm

    • Reg[rd] <- PC + 4; PC <- PC + imm;

      • Write PC + 4 to Reg[rd] (return address)

      • Sets PC = PC + offset

Adding JAL to datapath

What should be added to datapath?

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