title: Performance 32 bit vs. 64 bit arithmetic
body: <p>Are native <code>64 bit</code> integer arithmetic instructions slower than their <code>32 bit</code> counter parts (on <code>x86_64</code> machine with <code>64 bit</code> OS)?</p>
  
  <p>Edit: On current CPUs such Intel Core2 Duo, i5/i7 etc.</p>