[Bug 1674399] Re: OpenSSL CPU detection for AMD Ryzen CPUs

[Eric Desrochers]

** Description changed:

+ AMD added support in their processors for SHA Extensions starting with
+ Ryzen CPU. Current OpenSSL version in Ryzens still calls SHA for SSSE3
+ routine and shows no improvement.
+ 
  It has been brought to my attention that :
  "CPUID detection in OpenSSL does not properly detect potential optimizations for AMD processors."
  
  After further verification on my side :
  
  Extended feature flags were not pulled on AMD processors, as result a
  number of extensions were effectively masked on Ryzen CPUs. It should
  have been reported for Excavator since it implements AVX2 extension, but
  apparently nobody noticed ...
  
  The GitHub PR:
  https://github.com/openssl/openssl/pull/2849

** Description changed:

  AMD added support in their processors for SHA Extensions starting with
  Ryzen CPU. Current OpenSSL version in Ryzens still calls SHA for SSSE3
- routine and shows no improvement.
+ routine as result a number of extensions were effectively masked on
+ Ryzen and shows no improvement.
  
  It has been brought to my attention that :
  "CPUID detection in OpenSSL does not properly detect potential optimizations for AMD processors."
  
  After further verification on my side :
  
  Extended feature flags were not pulled on AMD processors, as result a
  number of extensions were effectively masked on Ryzen CPUs. It should
  have been reported for Excavator since it implements AVX2 extension, but
  apparently nobody noticed ...
  
  The GitHub PR:
  https://github.com/openssl/openssl/pull/2849

** Also affects: openssl (Ubuntu Artful)
   Importance: Medium
       Status: Triaged

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https://bugs.launchpad.net/bugs/1674399

Title:
  OpenSSL CPU detection for AMD Ryzen CPUs

Status in openssl package in Ubuntu:
  Triaged
Status in openssl source package in Artful:
  Triaged

Bug description:
  AMD added support in their processors for SHA Extensions starting with
  Ryzen CPU. Current OpenSSL version in Ryzens still calls SHA for SSSE3
  routine as result a number of extensions were effectively masked on
  Ryzen and shows no improvement.

  It has been brought to my attention that :
  "CPUID detection in OpenSSL does not properly detect potential optimizations for AMD processors."

  After further verification on my side :

  Extended feature flags were not pulled on AMD processors, as result a
  number of extensions were effectively masked on Ryzen CPUs. It should
  have been reported for Excavator since it implements AVX2 extension,
  but apparently nobody noticed ...

  The GitHub PR:
  https://github.com/openssl/openssl/pull/2849

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