title: Population count in AVX512
body: <p>I have been trying to use _mm256_popcnt_epi64 on a machine that supports AVX512 and on code that has previously been optimiized for AVX2.</p>
  
  <p>Unfortunately, I ran into the issue that the function isn't found.  The corresponding <code>__m512i</code> equivalent is found, however.  Is the <code>__m256i</code> function deprecated?</p>