[C] Which is faster?


if(a > 3)
{
  int expected_b = fun(a);
  if(good_enough(b, expected_b))
  {
    do_stuff();
  }
}

VS


int expected_b = fun(a);
if(a > 3 && good_enough(b, expected_b))
{
  do_stuff();
}

This is done a shitload of times. fun(a) is a simple linear function.

>>28
Poor compiler being slowed down. The has a really big effect on the program in the end, because if something is compiled slowly, it can only be executed slowly.