Answered: Without Forwarding With Full…

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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In this exercise, we examine how data dependences affect execution in the basic 5-stage pipeline described in Section 4.5. Problems in this exercise refer to the following sequence of instructions:

or $t0, $s2, $t0
and $t0, $a0, $s3
lw $t5, 24($t0)
sw $t0, 12($s6)
sub $t3, $t0, $t5

Also, assuming the following cycle times for each of the options related to forwarding:

Without Forwarding	With Full Forwarding	With ALU-ALU Forwarding Only
220 ps	260 ps	250 ps

Assume there is no forwarding in this pipelined processor. Indicate hazards and add nop instructions to eliminate them.

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