Question

Loop unroll the following MIPS code loop 4 times. Write the resulting code including any re-ordering...

Loop unroll the following MIPS code loop 4 times. Write the resulting code including any re-ordering necessary for maximum performance.

loop: sw $zero, 0($s0)

addi $s0, $s0, -4

bne $s0, $zero, loop

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Answer #1

The ALUMux control signal that controls the Mux in the ALU input, 0 (Reg) selects the register output and 1 (Imm) selects the immediate occurrence of the instruction name as the second input to the ALU. the Mux control signal in the Data entry in regis-ter fi le, 0 (ALU) selects the ALU output and 1 (Mem) selects the memory output. (it does not matter if the signal is 0 or 1

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