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    • Andy Polyakov's avatar
      x86_64 assembly pack: "optimize" for Knights Landing. · 738a9dd5
      Andy Polyakov authored
      "Optimize" is in quotes because it's rather a "salvage operation"
      for now. Idea is to identify processor capability flags that
      drive Knights Landing to suboptimial code paths and mask them.
      Two flags were identified, XSAVE and ADCX/ADOX. Former affects
      choice of AES-NI code path specific for Silvermont (Knights Landing
      is of Silvermont "ancestry"). And 64-bit ADCX/ADOX instructions are
      effectively mishandled at decode time. In both cases we are looking
      at ~2x improvement.
      
      Hardware used for benchmarking courtesy of Atos, experiments run by
      Romain Dolbeau <romain.dolbeau@atos.net>. Kudos!
      
      This is minimalistic backpoint of 64d92d74
      
      
      
      Thanks to David Benjamin for spotting typo in Knights Landing detection!
      
      Reviewed-by: default avatarRich Salz <rsalz@openssl.org>
      (Merged from https://github.com/openssl/openssl/pull/4006)
      738a9dd5
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