switch case vs if else [duplicate]

Question

I was wondering if there was any difference in the way the following code was compiled into assembly. I've heard that switch-case is more efficient than if else, but in this example I am not quite sure if that would be the case.

if(x==1){
...
}else if(x==2){
...
}else{
...
}

and

switch(x){
 case 1:
 ...
 break;

 case 2:
 ...
 break;

 default:
 ...
}