title: Optimal uint8_t bitmap into a 8 x 32bit SIMD "bool" vector
body: <p>As part of a compression algorithm, I am looking for the optimal way to achieve the following:</p>
  
  <p>I have a simple bitmap in a <code>uint8_t</code>. For example 01010011</p>
  
  <p>What I want is a <code>__m256i</code> of the form: (0, maxint, 0, maxint, 0, 0, maxint, maxint)</p>
  
  <p>One way to achieve this is by shuffling a vector of 8 x maxint into a vector of zeros. But that first requires me to expand my <code>uint8_t</code> to the right shuffle bitmap.</p>
  
  <p>I am wondering if there is a better way?</p>