Code Optimization Questions

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1.

Optimization can be categorized broadly into ____ types.

A

2

B

3

C

4

D

5

Correct Answer: A

Optimization can be categorized broadly into two types : machine independent and machine dependent.

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2.

 A fragment of code that resides in the loop and computes the same value at each iteration is called a?

A

Induction analysis

B

Strength reduction

C

loop-invariant code

D

None of the above

Correct Answer: C

A fragment of code that resides in the loop and computes the same value at each iteration is called a loop-invariant code. This code can be moved out of the loop by saving it to be computed only once, rather than with each iteration.

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3.

 A variable is called an _________ variable if its value is altered within the loop by a loop-invariant value.

A

Invariant 

B

induction

C

strength 

D

loop

Correct Answer: B

Induction analysis : A variable is called an induction variable if its value is altered within the loop by a loop-invariant value.

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4.

 Dead code plays no role in any program operation and therefore it can simply be eliminated.

A

TRUE

B

FALSE

C

Can be true or false

D

Can not say

Correct Answer: A

dead code plays no role in any program operation and therefore it can simply be eliminated.

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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 the above

Correct Answer: C

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

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6.

Peep-hole optimization is a form of 

A

loop optimization

B

local optimization

C

data flow analysis

D

constant folding

Correct Answer: D

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

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7.

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

A

creation of more optical matrix

B

recognition of basic elements and creation of uniform symbols

C

recognization of basic syntactic construction through reductionsc

D

use of macro-processor to produce more optimal assembly code

Correct Answer: A

In analyzing the compilation of PL/I program, the term Machine independent optimization is assosiated with creation of more optical matrix

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8.

Before generating intermediate code, the compiler can modify the intermediate code by address calculations and improving loops.

A

TRUE

B

FALSE

C

Can be true or false

D

Can not say

Correct Answer: B

After generating intermediate code, the compiler can modify the intermediate code by address calculations and improving loops.

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9.

The compiler can make use of memory hierarchy and CPU registers.

A

TRUE

B

FALSE

C

Can be true or false

D

Can not say

Correct Answer: A

While producing the target machine code, the compiler can make use of memory hierarchy and CPU registers.

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10.

A compiler for a high-level language that runs on one machine and produces code for a different machine is called

A

optimizing compiler

B

one pass compiler

C

cross compiler

D

multipass compiler

Correct Answer: C

A compiler for a high-level language that runs on one machine and produces code for a different machine is called cross compiler.

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