[Bug 2101084] [NEW] GCC produces wrong code for arm64+sve in some cases

[Luke Robison]

Public bug reported:

This bug-report is to request patching of the GCC bug 118976 in the
Ubuntu gcc packages to avoid correctness issues, especially in 24.04 and
22.04 LTS releases.

This issue effects SVE vectorization which involves bitwise-not during
optimization on arm64 platforms.  It was reported and fixed in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118976.

For gcc 8-11 there will be no minor releases as they are EOL from GCC
team.  For gcc 11 through trunk the fix will be included in the next
minor version, but my understanding is that Ubuntu LTS releases are
unlikely to upgrade minor versions.

** Affects: gcc
     Importance: Unknown
         Status: Unknown

** Affects: gcc-10 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gcc-11 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gcc-8 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gcc-9 (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: GCC Bugzilla #118976
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118976

** Also affects: gcc via
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118976
   Importance: Unknown
       Status: Unknown

** Also affects: gcc-9 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gcc-10 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gcc-11 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2101084

Title:
  GCC produces wrong code for arm64+sve in some cases

Status in gcc:
  Unknown
Status in gcc-10 package in Ubuntu:
  New
Status in gcc-11 package in Ubuntu:
  New
Status in gcc-8 package in Ubuntu:
  New
Status in gcc-9 package in Ubuntu:
  New

Bug description:
  This bug-report is to request patching of the GCC bug 118976 in the
  Ubuntu gcc packages to avoid correctness issues, especially in 24.04
  and 22.04 LTS releases.

  This issue effects SVE vectorization which involves bitwise-not during
  optimization on arm64 platforms.  It was reported and fixed in
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118976.

  For gcc 8-11 there will be no minor releases as they are EOL from GCC
  team.  For gcc 11 through trunk the fix will be included in the next
  minor version, but my understanding is that Ubuntu LTS releases are
  unlikely to upgrade minor versions.

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