Improve Power9 performance

[yuriy-yarosh]

• Implement critical sections optimizations, achieve equivalent speedup to SSE and BMI2 and provide optimal performance for the Power9 VSX hardware
• Improve bit manipulation and byte string checks, ensure that Power9 instruction set is being used properly
• Improve memory management
• Introduce dcbt / dcbtst / dcbz / lwsync cache hints
• Implement a proper performance metrics using the Performance Monitor Facility and the respective Counting registers

[edelsohn]

Have you pushed the current patches to your repo?

[barkovv]

@yuriy-yarosh Are you still working on it or I can pick up this issue?

[yuriy-yarosh]

I've finished it long time ago, but haven't been able to just simply to push it due to personal matters and long traveling schedule.

[attarian001]

I will resolve this issue

[clin1234]

Is this bounty still open for reward from BountySource?

[edelsohn]

Multiple patches have been created for the issue but Google refuses to consider any of them because Power is not a primary platform for them. Despite Snappy as an Open Source project that initially welcomed patches, the maintainers have chosen to use their authority to freeze out Power.