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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/103416] [12 Regression][OpenMP] Bogus
 firstprivate(n) map(to:n [len: 4][implicit])
Date: Thu, 25 Nov 2021 10:52:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103416

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Okay, the
  map(to:D.4217 [len: 4][implicit]) map(tofrom:n [len: 4][implicit])
issue is not new =E2=80=93 only the '[implicit]' + the misaligned address o=
ne (fixed by
the patch from comment 1).

 * * *

Thus regression =E2=86=92 comment 1

***

And extra map(to:D.4217) =E2=80=93 this occurs already with GCC 11 and is, =
thus, not a
regression.
(Only '[implicit]' is new.)

This seems to be due to a scope issue. In gimplify_omp_for

(gdb) p debug(for_stmt)
#pragma omp for nowait
for (i0 =3D 1; i0 <=3D D.4217; i0 =3D i0 + 1)
      REALPART_EXPR <scalar> =3D (real(kind=3D8)) n;

which then calls at some point
  omp_notice_variable (
debug_tree(decl) which ends up with
7698                            nflags |=3D GOVD_MAP | GOVD_MAP_TO_ONLY;

The problem is that here
        integer(kind=3D4) D.3933;
is generated in the parent scope of '#omp target' instead of in the parent
scope of '#omp parallel do'.

Thus, there are two questions:
* Why is 'map(to:' and not 'firstprivate' used?
* Why is the var generated in the parent scope of 'omp target' instead of
inside 'omp target'?=