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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/104774] New: OpenACC 'kernels' decomposition:
 internal compiler error: 'verify_gimple' failed, with 'loop' with explicit
 'seq' or 'independent'
Date: Thu, 03 Mar 2022 16:28:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104774

            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 =3D 0; k < 2; k++)
          arr_0 =3D k;

    #pragma acc loop independent reduction(+: arr_0)
        for (k =3D 0; k < 2; k++)
          arr_0 +=3D k;
      }
    }

With '-fopenacc --param openacc-kernels=3Ddecompose -O0 -g0' (so, not invol=
ving
'GIMPLE_DEBUG's), for both C and C++, we run into:

    pr.c: In function =E2=80=98foo._omp_fn.0=E2=80=99:
    pr.c:18:1: error: non-register as LHS of binary operation
       18 | }
          | ^
    # .MEM_21 =3D VDEF <.MEM_3>
    k =3D 0 + .offset.24_2;
    pr.c:18:1: error: invalid RHS for gimple memory store: =E2=80=98var_dec=
l=E2=80=99
    *_23;

    k

    # .MEM_24 =3D VDEF <.MEM_21>
    *_23 =3D k;
    pr.c:18:1: error: non-register as LHS of binary operation
    # .MEM_27 =3D VDEF <.MEM_4>
    k =3D 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).=