Timing 500000 iterations F time 0.006025 I time 0.011848 Expected, right? First you called `coolsize_i(lrand48())` and then `coolsize_f(lrand48())`? In

Timing 500000 iterations F time 0.006025 I time 0.011848 Expected, right? First you called `coolsize_i(lrand48())` and then `coolsize_f(lrand48())`? In your results F should be I and I should be F. In all your tests the F version is slower, as per my expectation.