[Bug target/78303] New: PowerPC vec-init-{1,2,4,5,8,9} tests do not run on -mlittle -maltivec=be

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78303

            Bug ID: 78303
           Summary: PowerPC vec-init-{1,2,4,5,8,9} tests do not run on
                    -mlittle -maltivec=be
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: meissner at gcc dot gnu.org
  Target Milestone: ---

I was fixing PR 78243, and I decided to try the vec-init-{1,2,4,5,8,9} tests
that I wrote when I was adding power8/power9 vector init/extract support with
the -maltivec=be option.  None of the vec-init tests run with -maltivec=be.

This option says that even though we are running on a little endian target, the
ordering of elements within Altivec/VSX registers is still big endian to allow
code that was targeted towards the big endian PowerPC to run.

I tested both GCC 6 and the current GCC 7 sources, and both fail.