OPT.SDIV

Use the shift operator on 'a / b' expressions

Description

This rule flags any `a/b' expression.

"/" is an expensive operation; using the shift operator is faster and more efficient.

Example

 package OPT;
 public class SDIV {
     public static final int NUM = 16;
     public void calculate(int a) {
         int div = a / 4; // should be replaced by "a >> 2".
         int div2 = a/ 8; // should be replaced by "a >> 3".
         int temp = a / 3;
     }
 }

Repair

 package OPT;
 public class SDIV {
     public static final int NUM = 16;
     public void calculate(int a) {
         int div = a >> 2;
         int div2 = 8 >> 3;
         int temp = a / 3; // not possible to replace this with shift
 //operator.
     }
 }