OpenMP: Fix use_device_{addr,ptr} with in-data-sharing arg
Commit Message
For
omp parallel shared(array_desc_var)
the shared-variable is passed to the generated function as
argument - and replaced by a DECL_VALUE_EXPR inside the parallel region.
If inside the parallel region, a
omp target data has_device_addr(array_descr_var)
is used, the latter generates a
omp_arr->array_descr_var = &array_descr_var.data;
...
tmp_desc = array_descr_var
tmp_desc.data = omp_o->array_descr_var
that is: 'tmp_desc' gets assigned the original descriptor
and only the data components is updated.
However, if that's inside the parallel region, not 'array_descr_var'
has to be used – but the value expression ('omp_i->array_descr_var').
Fixed by searching the variable used in use_device_{addr,ptr} in the
outer OpenMP context – and then checking for a DECL_VALUE_EXPR.
OK?
Tobias
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Comments
On Wed, Apr 20, 2022 at 03:19:38PM +0200, Tobias Burnus wrote:
> For array-descriptor vars, the descriptor is assigned to a temporary. However,
> this failed when the clause's argument was in turn in a data-sharing clause
> as the outer context's VALUE_EXPR wasn't used.
>
> gcc/ChangeLog:
>
> * omp-low.cc (lower_omp_target): Fix use_device_{addr,ptr} with list
> item that is in an outer data-sharing clause.
>
> libgomp/ChangeLog:
>
> * testsuite/libgomp.fortran/use_device_addr-5.f90: New test.
>
> gcc/omp-low.cc | 22 ++--
> .../libgomp.fortran/use_device_addr-5.f90 | 143 +++++++++++++++++++++
> 2 files changed, 156 insertions(+), 9 deletions(-)
>
> diff --git a/gcc/omp-low.cc b/gcc/omp-low.cc
> index bf5779b6543..6e387fd9a61 100644
> --- a/gcc/omp-low.cc
> +++ b/gcc/omp-low.cc
> @@ -13656,26 +13656,30 @@ lower_omp_target (gimple_stmt_iterator *gsi_p, omp_context *ctx)
> new_var = lookup_decl (var, ctx);
> new_var = DECL_VALUE_EXPR (new_var);
> tree v = new_var;
> + tree v2 = var;
> + if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_USE_DEVICE_PTR
> + || OMP_CLAUSE_CODE (c) == OMP_CLAUSE_USE_DEVICE_ADDR)
> + {
> + v2 = maybe_lookup_decl_in_outer_ctx (var, ctx);
> + if (DECL_HAS_VALUE_EXPR_P (v2))
> + v2 = DECL_VALUE_EXPR (v2);
I don't understand the above 2 lines, why do you need that?
Regardless whether v2 has DECL_VALUE_EXPR or not, the type of the
DECL_VALUE_EXPR (v2) and v2 should be the same, build_fold_indirect_ref
should work on both and then v2 is only used as second operand of
gimplify_assign, where the gimplifier makes sure to handle DECL_VALUE_EXPR
correctly. I certainly don't see any difference in the *.omplower dump
if I comment out the above 2 lines.
Otherwise LGTM, so if the 2 lines aren't needed, please also drop the
{}s around v2 = maybe_lookup_decl_in_outer_ctx (var, ctx); and reindent.
> + }
>
> if (is_ref)
> {
> - var = build_fold_indirect_ref (var);
> - gimplify_expr (&var, &assign_body, NULL, is_gimple_val,
> - fb_rvalue);
> - v = create_tmp_var_raw (TREE_TYPE (var), get_name (var));
> + v2 = build_fold_indirect_ref (v2);
> + v = create_tmp_var_raw (TREE_TYPE (v2), get_name (var));
> gimple_add_tmp_var (v);
> TREE_ADDRESSABLE (v) = 1;
> - gimple_seq_add_stmt (&assign_body,
> - gimple_build_assign (v, var));
> + gimplify_assign (v, v2, &assign_body);
> tree rhs = build_fold_addr_expr (v);
> gimple_seq_add_stmt (&assign_body,
> gimple_build_assign (new_var, rhs));
> }
> else
> - gimple_seq_add_stmt (&assign_body,
> - gimple_build_assign (new_var, var));
> + gimplify_assign (new_var, v2, &assign_body);
>
> - tree v2 = lang_hooks.decls.omp_array_data (unshare_expr (v), false);
> + v2 = lang_hooks.decls.omp_array_data (unshare_expr (v), false);
> gcc_assert (v2);
> gimplify_expr (&x, &assign_body, NULL, is_gimple_val, fb_rvalue);
> gimple_seq_add_stmt (&assign_body,
Jakub
Hi Jakub,
On 04.05.22 14:03, Jakub Jelinek wrote:
> On Wed, Apr 20, 2022 at 03:19:38PM +0200, Tobias Burnus wrote:
>> --- a/gcc/omp-low.cc
>> +++ b/gcc/omp-low.cc
>> @@ -13656,26 +13656,30 @@ lower_omp_target (gimple_stmt_iterator *gsi_p, omp_context *ctx)
>> new_var = lookup_decl (var, ctx);
>> new_var = DECL_VALUE_EXPR (new_var);
>> tree v = new_var;
>> + tree v2 = var;
>> + if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_USE_DEVICE_PTR
>> + || OMP_CLAUSE_CODE (c) == OMP_CLAUSE_USE_DEVICE_ADDR)
>> + {
>> + v2 = maybe_lookup_decl_in_outer_ctx (var, ctx);
>> + if (DECL_HAS_VALUE_EXPR_P (v2))
>> + v2 = DECL_VALUE_EXPR (v2);
> I don't understand the above 2 lines, why do you need that?
I think it was intermittently required with some (half-)working patch.
But I concur that it is no longer is needed.
> Otherwise LGTM, so if the 2 lines aren't needed, please also drop the
> {}s around v2 = maybe_lookup_decl_in_outer_ctx (var, ctx); and reindent.
I did so, tested it also on my end and committed it as
r13-116-g3f8c389fe90bf565a6221a46bb7fb745dd4c1510
Thanks for the review!
Tobias
-----------------
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Hi!
On 2022-04-20T15:19:38+0200, Tobias Burnus <tobias@codesourcery.com> wrote:
> For
> omp parallel shared(array_desc_var)
> the shared-variable is passed to the generated function as
> argument - and replaced by a DECL_VALUE_EXPR inside the parallel region.
>
> If inside the parallel region, a
>
> omp target data has_device_addr(array_descr_var)
>
> is used, the latter generates a
> omp_arr->array_descr_var = &array_descr_var.data;
> ...
> tmp_desc = array_descr_var
> tmp_desc.data = omp_o->array_descr_var
>
> that is: 'tmp_desc' gets assigned the original descriptor
> and only the data components is updated.
>
>
> However, if that's inside the parallel region, not 'array_descr_var'
> has to be used – but the value expression ('omp_i->array_descr_var').
>
> Fixed by searching the variable used in use_device_{addr,ptr} in the
> outer OpenMP context – and then checking for a DECL_VALUE_EXPR.
I wonder if corresponding OpenACC clause needs similar consideration --
or maybe is covered with this 'OMP_CLAUSE_USE_DEVICE_PTR',
'OMP_CLAUSE_USE_DEVICE_ADDR' handling here (haven't looked yet).
> --- /dev/null
> +++ b/libgomp/testsuite/libgomp.fortran/use_device_addr-5.f90
> @@ -0,0 +1,143 @@
> +program main
> + use omp_lib
> + implicit none
> + integer, allocatable :: aaa(:,:,:)
> + integer :: i
> +
> + allocate (aaa(-4:10,-3:8,2))
> + aaa(:,:,:) = reshape ([(i, i = 1, size(aaa))], shape(aaa))
> +
> + do i = 0, omp_get_num_devices()
> + !$omp target data map(to: aaa)
> + call test_addr (aaa, i)
> + call test_ptr (aaa, i)
> + !$omp end target data
> + end do
Pushed to master branch commit 798152475559a6be8049692932cc747c6499e7f5
"Fix up 'libgomp.fortran/use_device_addr-5.f90' multi-device testing",
see attached.
Grüße
Thomas
> + deallocate (aaa)
> +
> +contains
> +
> + subroutine test_addr (aaaa, dev)
> + use iso_c_binding
> + integer, target, allocatable :: aaaa(:,:,:), bbbb(:,:,:)
> + integer, value :: dev
> + integer :: i
> + type(c_ptr) :: ptr
> + logical :: is_shared
> +
> + is_shared = .false.
> + !$omp target device(dev) map(to: is_shared)
> + is_shared = .true.
> + !$omp end target
> +
> + allocate (bbbb(-4:10,-3:8,2))
> + bbbb(:,:,:) = reshape ([(-i, i = 1, size(bbbb))], shape(bbbb))
> + !$omp target enter data map(to: bbbb) device(dev)
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 1
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 2
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 3
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 4
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> +
> + !$omp parallel do shared(bbbb, aaaa)
> + do i = 1,1
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 5
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 6
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 7
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 8
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> + ptr = c_loc (aaaa)
> + !$omp target data use_device_addr(bbbb, aaaa) device(dev)
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
> + if (is_shared) then
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> + end if
> + if (is_shared .neqv. c_associated (ptr, c_loc (aaaa))) error stop
> +
> + !$omp target has_device_addr(bbbb, aaaa) device(dev)
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> + !$omp end target
> + !$omp end target data
> + end do
> + !$omp target exit data map(delete: bbbb) device(dev)
> + deallocate (bbbb)
> + end subroutine test_addr
> +
> + subroutine test_ptr (aaaa, dev)
> + use iso_c_binding
> + integer, target, allocatable :: aaaa(:,:,:), bbbb(:,:,:)
> + integer, value :: dev
> + integer :: i
> + type(c_ptr) :: ptr
> + logical :: is_shared
> +
> + is_shared = .false.
> + !$omp target device(dev) map(to: is_shared)
> + is_shared = .true.
> + !$omp end target
> +
> + allocate (bbbb(-4:10,-3:8,2))
> + bbbb(:,:,:) = reshape ([(-i, i = 1, size(bbbb))], shape(bbbb))
> + !$omp target enter data map(to: bbbb) device(dev)
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 1
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 2
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 3
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 4
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> +
> + !$omp parallel do shared(bbbb, aaaa)
> + do i = 1,1
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 5
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 6
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 7
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 8
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> + ptr = c_loc (aaaa)
> + !$omp target data use_device_ptr(bbbb, aaaa) device(dev)
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
> + if (is_shared) then
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> + end if
> + if (is_shared .neqv. c_associated (ptr, c_loc (aaaa))) error stop
> +
> + ! Uses has_device_addr due to PR fortran/105318
> + !!$omp target is_device_ptr(bbbb, aaaa) device(dev)
> + !$omp target has_device_addr(bbbb, aaaa) device(dev)
> + if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
> + if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
> + if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
> + if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
> + if (any (aaaa /= -bbbb)) error stop 5
> + if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
> + error stop 6
> + !$omp end target
> + !$omp end target data
> + end do
> + !$omp target exit data map(delete: bbbb) device(dev)
> + deallocate (bbbb)
> + end subroutine test_ptr
> +end program main
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OpenMP: Fix use_device_{addr,ptr} with in-data-sharing arg
For array-descriptor vars, the descriptor is assigned to a temporary. However,
this failed when the clause's argument was in turn in a data-sharing clause
as the outer context's VALUE_EXPR wasn't used.
gcc/ChangeLog:
* omp-low.cc (lower_omp_target): Fix use_device_{addr,ptr} with list
item that is in an outer data-sharing clause.
libgomp/ChangeLog:
* testsuite/libgomp.fortran/use_device_addr-5.f90: New test.
gcc/omp-low.cc | 22 ++--
.../libgomp.fortran/use_device_addr-5.f90 | 143 +++++++++++++++++++++
2 files changed, 156 insertions(+), 9 deletions(-)
@@ -13656,26 +13656,30 @@ lower_omp_target (gimple_stmt_iterator *gsi_p, omp_context *ctx)
new_var = lookup_decl (var, ctx);
new_var = DECL_VALUE_EXPR (new_var);
tree v = new_var;
+ tree v2 = var;
+ if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_USE_DEVICE_PTR
+ || OMP_CLAUSE_CODE (c) == OMP_CLAUSE_USE_DEVICE_ADDR)
+ {
+ v2 = maybe_lookup_decl_in_outer_ctx (var, ctx);
+ if (DECL_HAS_VALUE_EXPR_P (v2))
+ v2 = DECL_VALUE_EXPR (v2);
+ }
if (is_ref)
{
- var = build_fold_indirect_ref (var);
- gimplify_expr (&var, &assign_body, NULL, is_gimple_val,
- fb_rvalue);
- v = create_tmp_var_raw (TREE_TYPE (var), get_name (var));
+ v2 = build_fold_indirect_ref (v2);
+ v = create_tmp_var_raw (TREE_TYPE (v2), get_name (var));
gimple_add_tmp_var (v);
TREE_ADDRESSABLE (v) = 1;
- gimple_seq_add_stmt (&assign_body,
- gimple_build_assign (v, var));
+ gimplify_assign (v, v2, &assign_body);
tree rhs = build_fold_addr_expr (v);
gimple_seq_add_stmt (&assign_body,
gimple_build_assign (new_var, rhs));
}
else
- gimple_seq_add_stmt (&assign_body,
- gimple_build_assign (new_var, var));
+ gimplify_assign (new_var, v2, &assign_body);
- tree v2 = lang_hooks.decls.omp_array_data (unshare_expr (v), false);
+ v2 = lang_hooks.decls.omp_array_data (unshare_expr (v), false);
gcc_assert (v2);
gimplify_expr (&x, &assign_body, NULL, is_gimple_val, fb_rvalue);
gimple_seq_add_stmt (&assign_body,
new file mode 100644
@@ -0,0 +1,143 @@
+program main
+ use omp_lib
+ implicit none
+ integer, allocatable :: aaa(:,:,:)
+ integer :: i
+
+ allocate (aaa(-4:10,-3:8,2))
+ aaa(:,:,:) = reshape ([(i, i = 1, size(aaa))], shape(aaa))
+
+ do i = 0, omp_get_num_devices()
+ !$omp target data map(to: aaa)
+ call test_addr (aaa, i)
+ call test_ptr (aaa, i)
+ !$omp end target data
+ end do
+ deallocate (aaa)
+
+contains
+
+ subroutine test_addr (aaaa, dev)
+ use iso_c_binding
+ integer, target, allocatable :: aaaa(:,:,:), bbbb(:,:,:)
+ integer, value :: dev
+ integer :: i
+ type(c_ptr) :: ptr
+ logical :: is_shared
+
+ is_shared = .false.
+ !$omp target device(dev) map(to: is_shared)
+ is_shared = .true.
+ !$omp end target
+
+ allocate (bbbb(-4:10,-3:8,2))
+ bbbb(:,:,:) = reshape ([(-i, i = 1, size(bbbb))], shape(bbbb))
+ !$omp target enter data map(to: bbbb) device(dev)
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 1
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 2
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 3
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 4
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+
+ !$omp parallel do shared(bbbb, aaaa)
+ do i = 1,1
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 5
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 6
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 7
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 8
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+ ptr = c_loc (aaaa)
+ !$omp target data use_device_addr(bbbb, aaaa) device(dev)
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
+ if (is_shared) then
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+ end if
+ if (is_shared .neqv. c_associated (ptr, c_loc (aaaa))) error stop
+
+ !$omp target has_device_addr(bbbb, aaaa) device(dev)
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+ !$omp end target
+ !$omp end target data
+ end do
+ !$omp target exit data map(delete: bbbb) device(dev)
+ deallocate (bbbb)
+ end subroutine test_addr
+
+ subroutine test_ptr (aaaa, dev)
+ use iso_c_binding
+ integer, target, allocatable :: aaaa(:,:,:), bbbb(:,:,:)
+ integer, value :: dev
+ integer :: i
+ type(c_ptr) :: ptr
+ logical :: is_shared
+
+ is_shared = .false.
+ !$omp target device(dev) map(to: is_shared)
+ is_shared = .true.
+ !$omp end target
+
+ allocate (bbbb(-4:10,-3:8,2))
+ bbbb(:,:,:) = reshape ([(-i, i = 1, size(bbbb))], shape(bbbb))
+ !$omp target enter data map(to: bbbb) device(dev)
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 1
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 2
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 3
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 4
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+
+ !$omp parallel do shared(bbbb, aaaa)
+ do i = 1,1
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 5
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 6
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 7
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 8
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+ ptr = c_loc (aaaa)
+ !$omp target data use_device_ptr(bbbb, aaaa) device(dev)
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
+ if (is_shared) then
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+ end if
+ if (is_shared .neqv. c_associated (ptr, c_loc (aaaa))) error stop
+
+ ! Uses has_device_addr due to PR fortran/105318
+ !!$omp target is_device_ptr(bbbb, aaaa) device(dev)
+ !$omp target has_device_addr(bbbb, aaaa) device(dev)
+ if (any (lbound (aaaa) /= [-4, -3, 1])) error stop 9
+ if (any (shape (aaaa) /= [15, 12, 2])) error stop 10
+ if (any (lbound (bbbb) /= [-4, -3, 1])) error stop 11
+ if (any (shape (bbbb) /= [15, 12, 2])) error stop 12
+ if (any (aaaa /= -bbbb)) error stop 5
+ if (any (aaaa /= reshape ([(i, i = 1, size(aaaa))], shape(aaaa)))) &
+ error stop 6
+ !$omp end target
+ !$omp end target data
+ end do
+ !$omp target exit data map(delete: bbbb) device(dev)
+ deallocate (bbbb)
+ end subroutine test_ptr
+end program main