title: Convert constant Double to Int in llvm IR
body: <p>Given the following IR, </p>
  
  <pre><code>%1 = call double @llvm.pow.f64(double %conv, double 9.000000e+00)
  </code></pre>
  
  <p>when the fraction part of second argument is zero, I want to get it(second argument) in int type.</p>
  
  <p>Can someone please suggest a method for this conversion?<br>
  Thank you in advance.</p>