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Compiler Design - Basics of code optimization

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1:  

In analyzing the compilation of PL/I program, the term "Machine independent optimization" is assosiated with 

A.

recognization of basic syntactic construction through reductions
B.

recognition of basic elements and creation of uniform symbols
C.

creation of more optical matrix
D.

use of macro-processor to produce more optimal assembly code
 
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Option: C

Explanation :

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2:  

 In analyzing the compilation of PL/I program the description " resolving symbolic address ( lables ) and generating machine language " is associated with

A.

assembly and output
B.

code generation
C.

storage assignment
D.

syntax analysis
 
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Option: A

Explanation :

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3:  

 In analyzing the compilation of PL/I program the description " creation of more optimal matrix " is assosiated with

A.

assembly and output
B.

code generation
C.

syntax analysis
D.

machine independent optimization
 
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Option: D

Explanation :

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4:  

 Peep-hole optimization is a form of 

A.

loop optimization
B.

local optimization
C.

constant folding 
D.

data flow analysis
 
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Option: C

Explanation :

Redundant instructions may be discarded during the final stage of compilation by using a simple optimizing technique called peephole optimization.It is a kind of optimization performed over a very small set of instructions in a segment of generated code. The set is called a "peephole" or a "window". It works by recognising sets of instructions that can be replaced by shorter or faster sets of instructions and it uses some common techniques : Constant folding. So option (C) is correct

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thangamari said: (9:54am on Thursday 6th October 2016)
local optimization..............bcoz isro 2016.....answer is B...objection question..for many people the correct answer is C..but isro is not changed the answer...

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5:  

Substitution of values for names whose values are constant, is done in

A.

local optimization
B.

loop optimization
C.

constant folding
D.

none of these
 
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Option: C

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Syllabus Covered in this section is

  • Compilation and Interpretation 
  • Bootstrap compilers
  • Phases of compilation process
  • Lexical analysis
  •  Context free grammars
  • Parsing and parse trees
  • Representation of parse (derivation) trees as rightmost and leftmost derivations
  • Bottom up parsers-shift-reduce, operator precedence and LR
  • Topdown parsers-left recursion and its· removal.
  • Recursive descent parser.
  • Predictive parser
  • Intermediate codes-Quadruples, Triples
  • Intermediate code generation
  • Target code generation
  • Basics of  Code optimization
  • Syntax directed translation
  • Runtime environments

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