Consider the following intermediate code: r1 = 5 vl1 = r1 jmp Simple.f@o jmp Simple.f@1 Simple.f@o: write vli 12 =7 13 = vl1 + r2 vl1 = r3 jmp Simple.f@o Simple.f@1: ro = vl1 return (i) Describe briefly what the optimisation dead code elimination involves. (ii) Show the result of applying dead code elimination to the intermediate code above.

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 intermediate code:
r1 = 5
vl1 = r1
jmp Simple.f@o
jmp Simple.f@1
Simple.f@0:
write vl1
r2 = 7
13 = vl1 + r2
vl1 = r3
jmp Simple.f@o
Simple.f@1:
ro = vl1
return
(i) Describe briefly what the optimisation dead code elimination
involves.
(ii) Show the result of applying dead code elimination to the
intermediate code above.
Transcribed Image Text:Consider the following intermediate code: r1 = 5 vl1 = r1 jmp Simple.f@o jmp Simple.f@1 Simple.f@0: write vl1 r2 = 7 13 = vl1 + r2 vl1 = r3 jmp Simple.f@o Simple.f@1: ro = vl1 return (i) Describe briefly what the optimisation dead code elimination involves. (ii) Show the result of applying dead code elimination to the intermediate code above.
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