Dead-code elimination in machine code optimization refersto ...

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Dead-code elimination in machine code optimization refersto -----------

Removal of all labels.

Removal of values that never get used.

Removal of function which are not involved.

Removal of a module after its use.

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

TRUE

FALSE

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

Invariant

induction

strength

loop

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In compiler terminology reduction in strength means-----

Replacing run time computation by compile time computation

Removing loop invariant computation

Removing common subexpressions

replacing a costly operation by a relatively cheaper one

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

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FALSE

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Some code optimizations are carried out on the intermediate code because------

They enhance the portability of the compiler to other target processors

Program analysis is more accurate on intermediate code than on machine code

The information from dataflow analysis cannot otherwise be used for optimization

The information from the front end cannot otherwise be used for optimization

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category More Compiler Design Topics

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Non Deterministic Finite Automata

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Regular Expressions

Finite Automata

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Run Time Environment

Code Generation

Code Optimization

Parsing

Transformation from NFA to DFA

Cross Compiler

Epsilon Moves

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