OPT.SMUL

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 SMUL {
     public void calculate(int a) {
         int mul = a * 4; // should be replaced with "a << 2".
         int mul2 = 8 * a; // should be replaced with "a << 3".
         int temp = a * 3;
     }
 }

Repair

 package OPT;
 public class SMUL {
     public void calculate(int a) {
         int mul = a << 2;  
         int mul2 = a << 3; 
         int temp = a * 3;       // not possible to replace this with 
shift operator.
     }
 }