[Bug middle-end/104774] New: OpenACC 'kernels' decomposition: internal compiler error: 'verify_gimple' failed, with 'loop' with explicit 'seq' or 'independent'

[Bug middle-end/104774] New: OpenACC 'kernels' decomposition: internal compiler error: 'verify_gimple' failed, with 'loop' with explicit 'seq' or 'independent'

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104774

            Bug ID: 104774
           Summary: OpenACC 'kernels' decomposition: internal compiler
                    error: 'verify_gimple' failed, with 'loop' with
                    explicit 'seq' or 'independent'
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, openacc
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: tschwinge at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
  Target Milestone: ---

Another one in addition to PR104132, PR104133, that is *not* fixed by my WIP
patches for those:

    int arr_0;

    void
    foo (void)
    {
    #pragma acc kernels
      {
        int k;

    #pragma acc loop seq
        for (k = 0; k < 2; k++)
          arr_0 = k;

    #pragma acc loop independent reduction(+: arr_0)
        for (k = 0; k < 2; k++)
          arr_0 += k;
      }
    }

With '-fopenacc --param openacc-kernels=decompose -O0 -g0' (so, not involving
'GIMPLE_DEBUG's), for both C and C++, we run into:

    pr.c: In function ‘foo._omp_fn.0’:
    pr.c:18:1: error: non-register as LHS of binary operation
       18 | }
          | ^
    # .MEM_21 = VDEF <.MEM_3>
    k = 0 + .offset.24_2;
    pr.c:18:1: error: invalid RHS for gimple memory store: ‘var_decl’
    *_23;

    k

    # .MEM_24 = VDEF <.MEM_21>
    *_23 = k;
    pr.c:18:1: error: non-register as LHS of binary operation
    # .MEM_27 = VDEF <.MEM_4>
    k = 0 + 2;
    during GIMPLE pass: ssa
    pr.c:18:1: internal compiler error: verify_gimple failed

Only with both 'loop's changed to implicit or explicit 'auto' (that is, both
'seq' and 'independent' removed), we succeed to compile (with my PR104132,
PR104133 WIP patches applied).

[Bug middle-end/104774] OpenACC 'kernels' decomposition: internal compiler error: 'verify_gimple' failed, with 'loop' with explicit 'seq' or 'independent'

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104774

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.org>:

https://gcc.gnu.org/g:448741533a75862ebf51d8e73eb1dd1f6a47eec5

commit r12-7579-g448741533a75862ebf51d8e73eb1dd1f6a47eec5
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Thu Mar 3 18:00:52 2022 +0100

    Add 'c-c++-common/goacc/kernels-decompose-pr104774-1.c' [PR104774]

    ..., currently XFAILed with 'dg-ice'.

            PR middle-end/104774
            gcc/testsuite/
            * c-c++-common/goacc/kernels-decompose-pr104774-1.c: New file.

[Bug middle-end/104774] OpenACC 'kernels' decomposition: internal compiler error: 'verify_gimple' failed, with 'loop' with explicit 'seq' or 'independent'

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104774

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.org>:

https://gcc.gnu.org/g:7a5e036b61aa088e6b8564bc9383d37dfbb4801e

commit r12-7580-g7a5e036b61aa088e6b8564bc9383d37dfbb4801e
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Mon Feb 14 16:56:35 2022 +0100

    [OpenACC privatization] Analyze 'lookup_decl'-translated DECL [PR90115,
PR102330, PR104774]

    ... so that it matches what we analyze and what we action on.
    Fix-up for commit 29a2f51806c5b30e17a8d0e9ba7915a3c53c34ff "openacc:
    Add support for gang local storage allocation in shared memory [PR90115]".

            PR middle-end/90115
            PR middle-end/102330
            PR middle-end/104774
            gcc/
            * omp-low.cc (oacc_privatization_candidate_p)
            (oacc_privatization_scan_clause_chain)
            (oacc_privatization_scan_decl_chain, lower_oacc_private_marker):
            Analyze 'lookup_decl'-translated DECL.
            gcc/testsuite/
            * c-c++-common/goacc/kernels-decompose-pr104061-1-3.c: Adjust.
            * c-c++-common/goacc/kernels-decompose-pr104061-1-4.c: Likewise.
            * c-c++-common/goacc/kernels-decompose-pr104132-1.c: Likewise.
            * c-c++-common/goacc/kernels-decompose-pr104133-1.c: Likewise.
            * c-c++-common/goacc/kernels-decompose-pr104774-1.c: Likewise.
            * c-c++-common/goacc/privatization-1-compute-loop.c: Likewise.
            * c-c++-common/goacc/privatization-1-compute.c: Likewise.
            * c-c++-common/goacc/privatization-1-routine_gang-loop.c:
            Likewise.
            * c-c++-common/goacc/privatization-1-routine_gang.c: Likewise.
            * gfortran.dg/goacc-gomp/pr102330-1.f90: Likewise, and subsume...
            * gfortran.dg/goacc-gomp/pr102330-2.f90: ... this file, and...
            * gfortran.dg/goacc-gomp/pr102330-3.f90: ... this file.
            * gfortran.dg/goacc/privatization-1-compute-loop.f90: Adjust.
            * gfortran.dg/goacc/privatization-1-compute.f90: Likewise.
            * gfortran.dg/goacc/privatization-1-routine_gang-loop.f90:
            Likewise.
            * gfortran.dg/goacc/privatization-1-routine_gang.f90: Likewise.
            libgomp/
            * testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c:
            Enhance.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-local-worker-1.c:
            Adjust.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-local-worker-2.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-local-worker-3.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-local-worker-4.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-local-worker-5.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-vector-1.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-vector-2.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-worker-2.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-worker-3.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-worker-4.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-worker-5.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-worker-6.c:
            Likewise.
            *
testsuite/libgomp.oacc-c-c++-common/kernels-private-vars-loop-worker-7.c:
            Likewise.
            * testsuite/libgomp.oacc-fortran/optional-private.f90: Likewise.
            * testsuite/libgomp.oacc-fortran/privatized-ref-1.f95: Likewise.
            * testsuite/libgomp.oacc-fortran/privatized-ref-2.f90: Likewise.

[Bug middle-end/104774] OpenACC 'kernels' decomposition: internal compiler error: 'verify_gimple' failed, with 'loop' with explicit 'seq' or 'independent'

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104774

Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jules at gcc dot gnu.org
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=102330,
                   |                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=90115
         Resolution|---                         |FIXED

--- Comment #3 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
.