"Dead code" may be caused by

What is critical code?

Is there any dependence in this code?

DO I=1,N  S1 A(I+1) =F(I)  S2 F(I+1) = A(I)END DO

Is there any dependence in this code?

DO I=1,N  S1 A(I)=…  S2 …=A(I)END DO

How data dependencies are used in the code generation?

Loop invariant code motion

What benefits would give correct code formatting?

Choose code fragments which are good for optimizing

Choose the correct statements for the code:

DO I=1,N  S1 A(I) = B(I) + 1   S2 B(I+1) = A(I) – 5END DO

Choose the code resulting to the loop peeling for:

p = 10; for (i=0; i<10; ++i) {     y[i] = x[i] + x[p];   p = i;} 

Choose the correct statements for this code:

S1 PI = 3.14S2 R  = 5S3 AREA = PI*R **2