Comment by Kevin_Flynn

So, returning 2 values is more performant than returning 1.

How does this affect branch prediction ?

When code is structued:

  ...

  result = function1(arg1,arg2,etc);
  if ( !result ) handle_error(result);

  result = function2(arg1,arg2,etc);
  if ( !result ) handle_error(result);

  ...

branch prediction performs well.

I guess if you're checking and branching on 2 values, it performs twice as well ?