------- Comment From [email protected] 2020-02-06 22:14 EDT-------
Where we are up to is there is a small amount of progress in the zlib-devel 
(https://zlib.net/mailman/listinfo/zlib-devel_madler.net) however nothing 
explicit on or off list about merging arch specific patches (from any 
architecture vendor).

At the request of the community and other vendors, we have added explicit crc32 
tests to the zlib and these have been pushed to that upstream PR.
https://github.com/madler/zlib/pull/335

Since the patch on this bug report, the code has been changed from ASM
to C (to increase the portability ), conformed closer to an upstream
style as far a location and interfaces, and improved the test suite as
mentioned.

The zlib1g-dev package in focal (https://packages.ubuntu.com/focal
/zlib1g-dev)  still uses configure && make which the upstream PR patches
correctly (notably I haven't patched CMakefiles as of today). Building
`make crc32_test && ./crc32_test` as a test can be done quickly in the
package build process to validate the accuracy.

We hope this prudence and validation in the upstream PR
https://github.com/madler/zlib/pull/335 can be accepted for the
ubuntu-20.04 LTS release of the zlib package while we continue to work
with upstream on maintenance.

Thanks for your consideration.

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https://bugs.launchpad.net/bugs/1742941

Title:
  zlib: improve  crc32 performance on P8

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