[Bug 1449118] Re: [Ubuntu 15.10] gcc: POWER8 unaligned vector access performance

[Steve Langasek]

gcc 5.2.1 is now the default in wily, so I believe this issue is
resolved for 15.10.

** Changed in: gcc-defaults (Ubuntu)
       Status: In Progress => Fix Released

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Title:
  [Ubuntu 15.10] gcc: POWER8 unaligned vector access performance

Status in gcc-defaults package in Ubuntu:
  Fix Released

Bug description:
  POWER8 hardware provides much better performance for unaligned vector
  memory references than previous processors.  However, GCC hadn't
  previously caught up with the vectorization modeling for this.  I now
  have patches upstream for this, implemented with the following
  revisions:

  GCC trunk (version 6):  222349, 222372
  GCC 5.1:  222386, 222395
  GCC 4.9:  222412
  GCC 4.8:  222423

  I would like to see the backported patch applied to the gcc shipped
  with the Ubuntu 15.10 release.  We should also discuss applying it to
  the next available service pack for the 14.04 LTS release.

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