title: How to do 64-bit by 32-bit division?
body: <p>I use IAR with STM32 and I need 64-bit arithmetic. How to implement 32-bit array for 64-bit arithmetic?</p>
  
  <p>For example I have a 64 bit value <code>0x3B5456DF32</code> stored in a 32-bit array</p>
  
  <pre><code>A[0]= 0x3B
  A[1] = 0x5456DF32
  </code></pre>
  
  <p>I have to divide it by <code>B = 0x3216523</code></p>