[Bug target/84033] New: powerpc64le -moptimize-swaps bad code with vec_vbpermq

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84033

            Bug ID: 84033
           Summary: powerpc64le -moptimize-swaps bad code with vec_vbpermq
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amodra at gmail dot com
  Target Milestone: ---

Created attachment 43235
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43235&action=edit
testcase

The attached testcase fails on ppc64le with -O2 -mcpu=power8, and passes when
-mno-optimize-swaps is used.