for(;;), being equivalent to for(;1;), also has that condition that has to be checked. So, it all boils down to how compilers treat the two.

And to add oil to the fire, here are some even 'better' ways to do this:

  do {
    ...
  } while(1);

At least that fits the common macro pattern "do{...}while(0)" (http://stackoverflow.com/questions/257418/do-while-0-what-is...).

Of course, all of these are inferior to:

  considered:
    ...
  goto considered;