Compiler Quiz 2 (III Cse C)
- 1.The address code involves
- A.
Exactly 3 address
- B.
At most Three address
- C.
No unary operators
- D.
None of the mentioned
- 2.An intermediate code form is
- A.
Post-fix Notation
- B.
Syntax Trees
- C.
Three address code
- D.
All of the mentioned
- 3.The graph that shows basic blocks and their successor relationship is called
- A.
Dag
- B.
Flow Graph
- C.
Control Graph
- D.
Hamilton Graph
- 4.Some code optimizations are carried out on the intermediate code because
- A.
They enhance the portability of the compiler to other target processors
- B.
Program analysis is more accurate on intermediate code than on machine code
- C.
The information from dataflow analysis cannot otherwise be used for optimization
- D.
The information from the front end cannot otherwise be used for optimization
- 5.Consider the following C code segment. for (i = 0, i { for (j=0; j { if (i%2) { x += (4*j + 5*i); y += (7 + 4*j); }} } Which one of the following is false?
- A.
The code contains loop invariant computation
- B.
There is scope of common sub-expression elimination in this code
- C.
There is scope of strength reduction in this code
- D.
There is scope of dead code elimination in this code
- 6.Consider the intermediate code given below: 1. i = 1 2. j = 1 3. t1 = 5 * i 4. t2 = t1 + j 5. t3 = 4 * t2 6. t4 = t3 7. a[t4] = –1 8. j = j + 1 9. if j <= 5 goto(3) 10. i = i + 1 11. if i < 5 goto(2) The number of nodes and edges in the control-flow-graph constructed for the above code, respectively, are
- A.
5 and 7
- B.
6 and 7
- C.
5 and 5
- D.
7 and 8
- 7.Consider the following code segment. x = u - t; y = x * v; x = y + w; y = t - z; y = x * y; The minimum number of total variables required to convert the above code segment to static single assignment form is
- A.
6
- B.
8
- C.
9
- D.
10
- 8.Consider the following source code : c = a + b d = c c = c – e a = d – e b = b * e b = d/b Which of the following is correct optimization of given code?
- A.
c = a + b t = b * e a = d – e b = d/t c = a
- B.
c = a + b d = c c = c – e a = d – e b = d/b
- C.
d = c c = c – e a = d – e b = b * e b = d/b
- D.
None of the above
- 9.Peephole optimization is form of
- A.
Loop optimization
- B.
Local optimization
- C.
Constant folding
- D.
Data flow analysis
- 10.In compiler terminology reduction in strength means
- A.
Replacing run time computation by compile time computation
- B.
Removing common subexpression
- C.
Removing loop invariant computation
- D.
Replacing a costly operation by a relatively cheaper one
- 11.Substitution of values for names (whose values are constants) is done in
- A.
Local optimization
- B.
Loop optimization
- C.
Constant folding
- D.
Strength reduction
- 12.The method which merges the bodies of two loops is
- A.
Loop rolling
- B.
Loop Jamming
- C.
Constant folding
- D.
None of these
- 13.Syntax directed translation scheme is desirable because
- A.
It is based on the syntax
- B.
Its description is independent of any implementation
- C.
It is easy to modify
- D.
All of these
- 14.The optimization technique which is typically applied on loops is
- A.
Removal of invariant computation
- B.
Peephole optimization
- C.
Constant folding
- D.
All of these
- 15.The graph that shows basic blocks and their successor relationship is called
- A.
DAG
- B.
Flow graph
- C.
Control graph
- D.
Hamiltonian graph
- 16.An intermediate code form is
- A.
Postfix notation
- B.
Syntax trees
- C.
Three address code
- D.
All of these
- 17.Input to code generator
- A.
Source code
- B.
Intermediate code
- C.
Target code
- D.
All of the above
- 18.The identification of common sub-expression and replacement of run-time computations by compile-time computations is
- A.
Local optimization
- B.
Loop optimization
- C.
Constant folding
- D.
Data flow analysis
- 19.Local and loop optimization in turn provide motivation for
- A.
Data flow analysis
- B.
Constant folding
- C.
Peep hole optimization
- D.
DFA and constant folding
- 20.An optimizing compiler
- A.
Is optimized to occupy less space
- B.
Is optimized to take less time for execution
- C.
Optimizes the code
- D.
All of the above
- 21.A basic block can be analyzed by
- A.
DAG
- B.
A flow graph
- C.
A graph with cycles
- D.
None of the above
- 22.A pictorial representation of the value computed by each statement in the basic block is
- A.
Tree
- B.
DAG
- C.
Graph
- D.
None of the above
- 23.Boolean expressions have following purposes
- A.
Computing logical values
- B.
Used as conditional expressions
- C.
Both a &b
- D.
None of the above
- 24.__________can be used to generate code for Boolean expressions and flow of-control statements in one pass.
- A.
Backpatching
- B.
Code-generator
- C.
Parser
- D.
Static checker
- 25.Principal methods of representing the value of boolean expression
- A.
Encoding true & false numerically
- B.
To evaluate boolean expression analogously to an arithmetic expression
- C.
Implementing boolean expression by flow of control
- D.
All of the above
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