Compiler Design | Practice Type |

Question

Match the following statements with True (T) / False (F).

S1: replacing A + 4*3 with A + 12 is called strength reduction
S2: replacing A * 4 with A << 2 is called constant folding

Options:

• TT

• TF

• FT

• FF

 

 

Answer 1

D

Both statements are false. The correct statements are:

S1: replacing A + 4*3 with A + 12 is called constant folding.
S2: replacing A * 4 with A << 2 is called strength reduction.

“Evaluation of constant expressions at compile time is constant folding, whereas replacing expensive operations with cheaper ones is strength reduction.”