For the code sequence below, state whether it must stall, can avoid stalls using only forwarding, orcan execute without stalling or forwarding.i1: addi $t1, $to, 112: addi $t2, $t1, 213: addi $t3, $t0, 214: addi $t4, $t0, 4i5: addi $t4, $t3, -116: beq $t0, $0 endend:Which lines in the program would require stalls based on data dependenciesReorder the program so that no stalls are required.

ADD R1, R2, R3SUB R4, R1, R5AND R6, R1, R7OR R8, R1, R9XOR R10, R1, R11ALUMem RegADD instruction causes a hazard in next 3 instructions b/c register not written until after those 3 read it. Forwarding• Problem illustrated on previous slide can actually be solved relatively easily – with forwarding• Can we move the result from EX/MEM register to the beginning of ALU (where SUB needs it)?– Yes! • Generally speaking:– Forwarding occurs when a result is passed directly to functional unit that requires it.– Result goes from output of one unit to input of anotherWhen can we forward? ALUMem Reg DM Reg ALUMem Reg DM Reg ALUMem Reg DMMem RegTimeADD R1, R2, R3SUB R4, R1, R5AND R6, R1, R7OR R8, R1, R9XOR R10, R1, R11ALUMem RegSUB gets info. from EX/MEM pipe registerAND gets info. from MEM/WB pipe registerOR gets info. by forwarding fromregister fileRule of thumb: If line goes “forward” you can do forwarding. " "If its drawn backward, it’s physically imposs

Engineering

Computer Science

For the code sequence below, state whether it must stall, can avoid stalls using only forwarding, or can execute without stalling or forwarding. i1: addi $t1, $to, 1 12: addi $t2, $t1, 2 13: addi $t3, $t0, 2 14: addi $t4, $to, 4 i5: addi $t4, $t3, -1 16: beq $t0, $0, end end: Which lines in the program would require stalls based on data dependencies

For the code sequence below, state whether it must stall, can avoid stalls using only forwarding, or can execute without stalling or forwarding. i1: addi $t1, $to, 1 12: addi $t2, $t1, 2 13: addi $t3, $t0, 2 14: addi $t4, $to, 4 i5: addi $t4, $t3, -1 16: beq $t0, $0, end end: Which lines in the program would require stalls based on data dependencies

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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