onsider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor impleme ypassing/forwarding and 1-cycle branch delay slot. For the below co bserved? Assume that the loop runs a total of 1024 times. abel: Idw r8, 0(r10) ; load into r8 from MEM[0+r10] add r9, r8, r7; r9 = r8 + r7 addi r10, r10, 4; r10 = r10 + 4 addi r12, r12, 4; r12 = r12 + 4 bne r10, r11, Label; branch to Label if r10 != r11 stw r9, -4(r12); store r9 into MEM[-4+r12]

onsider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor impleme ypassing/forwarding and 1-cycle branch delay slot. For the below co bserved? Assume that the loop runs a total of 1024 times. abel: Idw r8, 0(r10) ; load into r8 from MEM[0+r10] add r9, r8, r7; r9 = r8 + r7 addi r10, r10, 4; r10 = r10 + 4 addi r12, r12, 4; r12 = r12 + 4 bne r10, r11, Label; branch to Label if r10 != r11 stw r9, -4(r12); store r9 into MEM[-4+r12]

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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Question

2. Consider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor implementation that uses
bypassing/forwarding and 1-cycle branch delay slot. For the below code, how many stalls will be
observed? Assume that the loop runs a total of 1024 times.
Label: Idw r8, 0(r10) ; load into r8 from MEM[0+r10]
add r9, r8, r7; r9 = r8 + r7
addi r10, r10, 4; r10 = r10 + 4
addi r12, r12, 4; r12 = r12 + 4
bne r10, r11, Label; branch to Label if r10 != r11
stw r9, -4(r12); store r9 into MEM[-4+r12]
3. Consider the same piece of code as in Problem 2 above. Show a re-ordering of the instructions
in order to avoid/reduce stall cycles.

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Systolic arrays run MISD. Systolic arrays are data processing pipelines, or wavefronts. These sections may operate without programme counters since data initiates execution. To allow "lock-step" computing, systolic array CPUs with synchronised clocks alternate between computation and communication phases.
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