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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107236] [OpenMP] ICE for reverse offload: in
 expand_GOMP_TARGET_REV, at internal-fn.cc:376
Date: Wed, 12 Oct 2022 13:47:24 +0000
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X-Bugzilla-Product: gcc
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X-Bugzilla-Keywords: ice-on-valid-code, openmp
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107236

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The problem seems to be that:

execute_omp_device_lower ()
...
        tree lhs =3D gimple_call_lhs (stmt), rhs =3D NULL_TREE;
        tree type =3D lhs ? TREE_TYPE (lhs) : integer_type_node;
        switch (gimple_call_internal_fn (stmt))
          {
          case IFN_GOMP_TARGET_REV:
is never reached.

Thus, IFN_GOMP_TARGET_REV remains - and the assert that IFN_GOMP_TARGET_REV=
 has
been removed fails, leading to the ICE.

It seems as if pass_omp_device_lower::gate(...) wrongly skips the generated
nested
function for parallel. The current check is:

      return (!(fun->curr_properties & PROP_gimple_lomp_dev)
              || (flag_openmp
                  && cgraph_node::get (fun->decl)->calls_declare_variant_al=
t));=