title: Do Intel CPUs support Trailing Bit Manipulation (TBM) instructions?
body: <p>Do Intel CPUs support TBM (Trailing Bit Manipulation) instructions?</p>
  
  <p>I am trying to use <code>bextr</code> on Intel <em>with an immediate argument</em> and getting a SIGILL when the <code>CPUID</code> bit for <code>tbm</code> is set. </p>
  
  <p>Does this mean that Intel CPUs do not support TBM?</p>
  
  <p>What is the proper way to check for TBM support? 
  Should only check this bit if the vendor id is <code>AuthenticAMD</code> ?</p>