[Bug 1932010] Re: [21.10 FEAT] zlib CRC32 optimization for s390x

[Simon Chopin]

I don't have access to your bugzilla, so I'm assuming you pointed to
your own patch and its crc32.c section where you pass hwcap by argument
and call it earlier in the stack? If so, I've implemented this approach
in this new debdiff, and the PPA has been updated as well :-).

Michael, if you're wondering why the s390_crc32_vx has migrated to
crc32.c, it's because the GLibc documentation mentions something about
ifunc only working properly if the deported functions are in the same
translation unit.

In the end, my version of the patch doesn't look that different to
Ilya's ;-)

** Patch added: "zlib.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/1932010/+attachment/5517342/+files/zlib.debdiff

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Title:
  [21.10 FEAT] zlib CRC32 optimization for s390x

Status in Ubuntu on IBM z Systems:
  In Progress
Status in zlib package in Ubuntu:
  In Progress

Bug description:
  Use SIMD instructions to accelerate the zlib CRC32 implementation.
  Business value: Performance improvement in database area

  The zlib CRC32 optimization for IBM Z is currently being discussed for inclusion into zlib-ng:
  https://github.com/zlib-ng/zlib-ng/pull/912

  The patch for zlib will be based on that.

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