[Bug middle-end/104892] New: OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104892

            Bug ID: 104892
           Summary: OpenACC 'kernels' decomposition: wrong-code cases
                    unless manually making certain variables addressable
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: openacc, wrong-code
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: tschwinge at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
  Target Milestone: ---

Even with the PR100280 etc. ICEs fixed, we still have the problem that we
generate wrong code in certain scenarios.  For example, see the remark in
current 'libgomp.oacc-c-c++-common/kernels-decompose-1.c' that "Without making
'[...]' addressable, [...] we will not see the expected value copied out".