[Bug 1999551] [NEW] glibc: backport AArch64 memcmp improvements

[Simon Chopin]

Public bug reported:

[impact]

glibc 2.37 contains a number of improvements to the memcmp routines for
server-grade AArch64 implementations (in particular, graviton3). They
should be backported to jammy and focal, as the LTS releases are by far
the most used on servers.

[test case]

TODO

[Regression potential]

This could potentially impact performance on other, non-server-grade
arm64 platforms such as RPi. We'll need to run tests against such
machines to check impact.

** Affects: glibc (Ubuntu)
     Importance: High
     Assignee: Simon Chopin (schopin)
         Status: In Progress

** Attachment added: "bench.tar.gz"
   https://bugs.launchpad.net/bugs/1999551/+attachment/5635514/+files/bench.tar.gz

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https://bugs.launchpad.net/bugs/1999551

Title:
  glibc: backport AArch64 memcmp improvements

Status in glibc package in Ubuntu:
  In Progress

Bug description:
  [impact]

  glibc 2.37 contains a number of improvements to the memcmp routines
  for server-grade AArch64 implementations (in particular, graviton3).
  They should be backported to jammy and focal, as the LTS releases are
  by far the most used on servers.

  [test case]

  TODO

  [Regression potential]

  This could potentially impact performance on other, non-server-grade
  arm64 platforms such as RPi. We'll need to run tests against such
  machines to check impact.

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