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

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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.

** Affects: gcc-defaults (Ubuntu)
     Importance: Undecided
     Assignee: Matthias Klose (doko)
         Status: In Progress


** Tags: architecture-ppc64le bot-comment bugnameltc-124329 severity-medium targetmilestone-inin1510
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[Ubuntu 15.10] gcc: POWER8 unaligned vector access performance
https://bugs.launchpad.net/bugs/1449118
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