title: c++ practical computational complexity of <cmath> SQRT()
body: <p>What is the difference in CPU cycles (or, in essence, in 'speed') between  </p>
  
  <pre><code> x /= y;
  </code></pre>
  
  <p>and</p>
  
  <pre><code> #include &lt;cmath&gt;
   x = sqrt(y);
  </code></pre>
  
  <p>EDIT: I know the operations aren't equivalent, I'm just arbitrarily proposing <code>x /= y</code> as a benchmark for <code>x = sqrt(y)</code></p>