Consider the following intermediate code: r1 = 5 vl1 = r1 jmp Simple.f@o jmp Simple.f@1 Simple.f@0: write vli 12 =7 13= vl1 + r2 vll = r3 jmp Simple.f@o Simple.f@1: ro = vl1 return (i) Describe briefly what the optimisation dead code elimination

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
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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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