GATE CSE 2006 | Code Generation and Optimization Question 17 | Compiler Design

GATE CSE 2006

MCQ (Single Correct Answer)

-0.6

Consider the following C code segment.

for (i = 0; i < n; i++) 
  { 
      for (j=0; j < n; j++) 
      { 
          if (i%2) 
          { 
           x += (4*j + 5*i); 
           y += (7 + 4*j); 
          } 
       } 
  }

Which one of the following is false?

The code contains loop invariant computation

There is scope of common sub-expression elimination in this code

There is scope of strength reduction in this code

There is scope of dead code elimination in this code

GATE CSE 2005

MCQ (Single Correct Answer)

-0.6

Consider line number 3 of the following C - program.

int main ( ) {              /* Line 1 */ 
int I, N;                   /* Line 2 */ 
fro (I = 0, I < N, I++);    /* Line 3 */ 
}

Identify the compiler's response about this line while creating the object-module

No compilation error

Only a lexical error

Only syntactic errors

Both lexical and syntactic errors

GATE CSE 2003

MCQ (Single Correct Answer)

-0.6

Consider the syntax directed definition shown below.

GATE CSE 2003 Compiler Design - Code Generation and Optimization Question 17 English

Here, gen is a function that generates the output code, and newtemp is a function that returns the name of a new temporary variable on every call. Assume that ti's are the temporary variable names generated by newtemp. For the statement 'X : = Y + Z', the 3-address code sequence generated by this definition is

$$X = Y + Z$$

$${t_1} = Y + Z;X = {t_1}$$

$${t_1} = Y;{t_2} = {t_1} + Z;X = {t_2}$$

$${t_1} = Y;{t_2} = Z;\,{t_3} = {t_1} + {t_2};X = {t_3}$$

GATE CSE 2003

MCQ (Single Correct Answer)

-0.6

Which of the following is NOT an advantage of using shared, dynamically linked libraries as opposed to using statically linked libraries?

Smaller sizes of executable files

Lesser overall page fault rate in the system

Faster program startup

Existing programs need not be re-linked to take advantage of newer versions of libraries