vec_xl and vec_xst intrinsics are broken in GCC 6 for ppc64 and ppc64el

Steve,

This one looks like it is Foundations.

                     Michael

On 02/01/2017 09:29 AM, Launchpad Bug Tracker wrote:
> bugproxy (bugproxy) has assigned this bug to you for Ubuntu:
>
> ---Problem Description---
> Please apply the patch from revision 245075 of the FSF gcc-6-branch as a bug fix for upstream bug PR79268, wherever GCC 6 is available. Without the fix, wrong code will be generated in some cases for the vec_xl and vec_xst intrinsic functions, which provide access to unaligned vector load and store instructions on POWER8 and later. The bug also shows up as a compile-time error when using a pointer-to-vector-pixel type as an argument to vec_xl or vec_xst. This latter failure mode has been seen in the field. A workaround for all failure modes is to replace vec_xl by vec_vsx_ld, and replace vex_xst by vec_vsx_st, but of course this is an invasive solution, and a fix to the compiler is preferred. Thank you!
>
> ---Steps to Reproduce---
> #include <altivec.h>
> extern vector pixel vp, *vpp;
> ...
> vp = vec_xl (0, vpp);
>
> Bill Schmidt (<email address hidden>), Peter Bergner (<email address hidden>)
>
> ** Affects: ubuntu
> Importance: Undecided
> Assignee: Taco Screen team (taco-screen-team)
> Status: New
>
>
> ** Tags: architecture-ppc64le bugnameltc-151137 severity-high targetmilestone-inin1704

--
Michael Hohnbaum
OIL Program Manager
Power (ppc64el) Development Project Manager
Canonical, Ltd.

This bug was fixed in the package gcc-6 - 6.3.0-8ubuntu1

---------------
gcc-6 (6.3.0-8ubuntu1) zesty; urgency=medium

  * Merge with Debian; remaining changes:
    - Build from upstream sources.

gcc-6 (6.3.0-8) unstable; urgency=medium

  * Update to SVN 20170221 (r245621) from the gcc-6-branch.
    - Fix ICEs PR middle-end/79537, PR sanitizer/79558, PR middle-end/79536.
  * Fix ecj1 symlink for gcj cross compiler packages. Addresses: #855640.
  * Bump binutils version requirement.

gcc-6 (6.3.0-7) unstable; urgency=medium

  * Update to SVN 20170218 (r245414) from the gcc-6-branch.
    - Fix PR target/78945 (ARM), PR translation/79397,
      PR tree-optimization/71824, PR tree-optimization/71824,
      PR tree-optimization/77318, PR target/71017 (x86), PR c++/78897,
      PR c++/78908, PR c++/79296 (closes: #854692), PR sanitizer/79562,
      PR libstdc++/79114, PR libstdc++/59170, PR libstdc++/59161,
      PR libstdc++/72792, PR libstdc++/72792, PR libstdc++/72793,
      PR libstdc++/69321, PR libstdc++/69301, PR libstdc++/79114,
      PR libstdc++/78702, PR libstdc++/78134, PR libstdc++/78273,
      PR c/79431, PR target 79545 (PPC), PR target/76731 (x86), PR c/79428,
      PR tree-optimization/79411, PR c/79431, PR middle-end/79399,
      PR tree-optimization/79338, PR target/79197 (PPC), PR target/79079,
      PR tree-optimization/79267, PR target/79495 (x86), PR c/79471,
      PR c++/79429, PR c/79431, PR c++/79377.
  * Update the Linaro support to the 6.3-2017.02 snapshot.
  * Fix target architecture for sparc non-multilib builds (Adrian Glaubitz).
    Closes: #855197.
  * Bump binutils version requirement.

 -- Matthias Klose <email address hidden> Tue, 21 Feb 2017 15:05:42 +0100

------- Comment From <email address hidden> 2018-01-17 11:57 EDT-------
Verified against (newer) gcc-6 package. " gcc-6 6.3.0-12ubuntu2 "