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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/102330] [12 Regression] ICE in expand_gimple_stmt_1, at
 cfgexpand.c:3932 since r12-1139-gf6bf436d9ab907d0
Date: Wed, 15 Sep 2021 10:27:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102330

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jules at gcc dot gnu.org,
                   |                            |tschwinge at gcc dot gnu.o=
rg

--- Comment #5 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> Just
> program p
>   !$omp taskloop lastprivate(i)
>   do i =3D 1, 8
>   end do
>   !$acc parallel loop
>   do i =3D 1, 8
>   end do
> end
> is enough to reproduce it.

Confirmed.

With '-fopt-info-omp-all --param=3Dopenacc-privatization=3Dnoisy' we're tol=
d:
'note: variable =E2=80=98i=E2=80=99 in =E2=80=98private=E2=80=99 clause is =
candidate for adjusting OpenACC
privatization level', and...

(In reply to Richard Biener from comment #1)
> Confirmed.  omp expansion seems to introudce this non-gimple code and lik=
ely
> also makes 'i' not a register (for OACC):
>=20
>   .data_dep.5D.4044 =3D .UNIQUE (OACC_PRIVATE, .data_dep.5D.4044, -1,
> &iD.4045);
>=20
> but
>=20
>   iD.4045 =3D 1 + .offset.9D.4049;
>=20
> and
>=20
>   iD.4045 =3D 1 + 8;
>=20
> (which is also unfolded)

... indeed the ICE goes away if I force-disable 'OACC_PRIVATE' commit
29a2f51806c5b30e17a8d0e9ba7915a3c53c34ff "openacc: Add support for gang loc=
al
storage allocation in shared memory [PR90115]" as follows:

    --- gcc/omp-low.c
    +++ gcc/omp-low.c
    @@ -10494,6 +10494,8 @@ static bool
     oacc_privatization_candidate_p (const location_t loc, const tree c,
                                    const tree decl)
     {
    +  return false;

Hmm.  Julian CCed.=