Consider the following loop. Loop:  lw    $t0, 0($t1)                   and   $s6, $s2, $t0                   lw    $t9, 0($s6)                   lw    $t8, 0($s6)            beq   $t8, $t9, loop   Assume that perfect branch prediction is used (no stalls due to control hazards), that there are no delay slots, and that the pipeline has full forwarding support. Also, assume that many iterations of this loop are executed before the loop exits.   Show a pipeline execution diagram for the third iteration of this loop, from the cycle in which we fetch the first instruction of that iteration up to (but not including) the cycle in which we can fetch the first instruction of the next iteration. Show all instructions that are in the pipeline during the cycles (not just the third iteration).

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
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Consider the following loop.

Looplw    $t0, 0($t1)       

           and   $s6, $s2, $t0       

           lw    $t9, 0($s6)       

           lw    $t8, 0($s6)

           beq   $t8, $t9, loop

 

Assume that perfect branch prediction is used (no stalls due to control hazards), that there are no delay slots, and that the pipeline has full forwarding support. Also, assume that many iterations of this loop are executed before the loop exits.

 

Show a pipeline execution diagram for the third iteration of this loop, from the cycle in which we fetch the first instruction of that iteration up to (but not including) the cycle in which we can fetch the first instruction of the next iteration. Show all instructions that are in the pipeline during the cycles (not just the third iteration).

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