[PATCH] [og8] Allow optional arguments to be used in the use_device OpenACC clause
Thomas Schwinge
thomas@codesourcery.com
Fri Feb 1 16:25:00 GMT 2019
Hi Kwok!
On Thu, 31 Jan 2019 18:30:35 +0000, Kwok Cheung Yeung <kcy@codesourcery.com> wrote:
> This patch allows for the use of Fortran optional arguments in the
> use_device clause of a host_data directive.
>
> I will push this into openacc-gcc-8-branch later today.
Per my testing, it unfortunately also introduces a number of regressions:
[-PASS:-]{+FAIL:+} gfortran.dg/goacc/uninit-use-device-clause.f95 -O (test for warnings, line 7)
PASS: gfortran.dg/goacc/uninit-use-device-clause.f95 -O (test for excess errors)
(This probably means that the clause argument is no longer
"evaluated/used".)
PASS: libgomp.c/target-14.c (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.c/target-14.c execution test
libgomp: cuCtxSynchronize error: an illegal memory access was encountered
PASS: libgomp.c/target-18.c (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.c/target-18.c execution test
libgomp: use_device_ptr pointer wasn't mapped
PASS: libgomp.c++/target-9.C (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.c++/target-9.C execution test
libgomp: use_device_ptr pointer wasn't mapped
PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-5.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O0 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-5.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O0 execution test
libgomp: use_device_ptr pointer wasn't mapped
PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-5.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O2 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-5.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O2 execution test
No error message.
PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-6.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O0 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-6.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O0 execution test
PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-6.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O2 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-6.c -DACC_DEVICE_TYPE_nvidia="nvptx-none" -DACC_MEM_SHARED=0 -foffload=nvptx-none -O2 execution test
PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-6.c -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O2 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-c/../libgomp.oacc-c-c++-common/host_data-6.c -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O2 execution test
host_data-6.exe: [...]/libgomp.oacc-c-c++-common/host_data-6.c:15: foo: Assertion `p == (float *) host_p' failed.
Same for C++, for "libgomp.oacc-c-c++-common/host_data-5.c", and
"libgomp.oacc-c-c++-common/host_data-6.c".
PASS: libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O0 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O0 execution test
PASS: libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O1 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O1 execution test
PASS: libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O2 (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O2 execution test
PASS: libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test
PASS: libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O3 -g (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -O3 -g execution test
PASS: libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -Os (test for excess errors)
[-PASS:-]{+FAIL:+} libgomp.oacc-fortran/host_data-1.f90 -DACC_DEVICE_TYPE_host="" -DACC_MEM_SHARED=1 -foffload=disable -Os execution test
STOP 1
Grüße
Thomas
> Optional arguments should be treated as references rather than pointers
> in the lowering. However, for non-present arguments, this would result
> in a null dereference, so conditionals need to be added to detect and
> handle this.
>
> gcc/
> * omp-low.c (lower_omp_target): For use_device clauses, generate
> conditional statements to treat Fortran optional arguments like
> references if non-null, or propogate null arguments into offloaded
> code otherwise.
>
> Reviewed-by: Julian Brown <julian@codesourcery.com>
> ---
> gcc/ChangeLog.openacc | 7 +++++
> gcc/omp-low.c | 77
> ++++++++++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 80 insertions(+), 4 deletions(-)
>
> diff --git a/gcc/ChangeLog.openacc b/gcc/ChangeLog.openacc
> index 5104eaa..58258fd 100644
> --- a/gcc/ChangeLog.openacc
> +++ b/gcc/ChangeLog.openacc
> @@ -1,5 +1,12 @@
> 2019-01-31 Kwok Cheung Yeung <kcy@codesourcery.com>
>
> + * omp-low.c (lower_omp_target): For use_device clauses, generate
> + conditional statements to treat Fortran optional arguments like
> + references if non-null, or propogate null arguments into offloaded
> + code otherwise.
> +
> +2019-01-31 Kwok Cheung Yeung <kcy@codesourcery.com>
> +
> * omp-general.c (omp_is_optional_argument): Add comment. Add extra
> check for Fortran language.
>
> diff --git a/gcc/omp-low.c b/gcc/omp-low.c
> index ef71704..3ae39c3 100644
> --- a/gcc/omp-low.c
> +++ b/gcc/omp-low.c
> @@ -8938,18 +8938,51 @@ lower_omp_target (gimple_stmt_iterator *gsi_p,
> omp_context *ctx)
> tkind = GOMP_MAP_FIRSTPRIVATE_INT;
> type = TREE_TYPE (ovar);
> if (TREE_CODE (type) == ARRAY_TYPE)
> - var = build_fold_addr_expr (var);
> + {
> + var = build_fold_addr_expr (var);
> + gimplify_assign (x, var, &ilist);
> + }
> else
> {
> - if (omp_is_reference (ovar))
> + tree opt_arg_label;
> + bool optional_arg_p = omp_is_optional_argument (ovar);
> +
> + if (optional_arg_p)
> + {
> + tree null_label
> + = create_artificial_label (UNKNOWN_LOCATION);
> + tree notnull_label
> + = create_artificial_label (UNKNOWN_LOCATION);
> + opt_arg_label
> + = create_artificial_label (UNKNOWN_LOCATION);
> + tree new_x = copy_node (x);
> + gcond *cond = gimple_build_cond (EQ_EXPR, ovar,
> + null_pointer_node,
> + null_label,
> + notnull_label);
> + gimple_seq_add_stmt (&ilist, cond);
> + gimple_seq_add_stmt (&ilist,
> + gimple_build_label (null_label));
> + gimplify_assign (new_x, null_pointer_node, &ilist);
> + gimple_seq_add_stmt (&ilist,
> + gimple_build_goto (opt_arg_label));
> + gimple_seq_add_stmt (&ilist,
> + gimple_build_label (notnull_label));
> + }
> +
> + if (omp_is_reference (ovar) || optional_arg_p)
> {
> type = TREE_TYPE (type);
> if (TREE_CODE (type) != ARRAY_TYPE)
> var = build_simple_mem_ref (var);
> var = fold_convert (TREE_TYPE (x), var);
> + gimplify_assign (x, var, &ilist);
> }
> +
> + if (optional_arg_p)
> + gimple_seq_add_stmt (&ilist,
> + gimple_build_label (opt_arg_label));
> }
> - gimplify_assign (x, var, &ilist);
> s = size_int (0);
> decl_args = append_decl_arg (ovar, decl_args, ctx);
> purpose = size_int (map_idx++);
> @@ -9137,11 +9170,43 @@ lower_omp_target (gimple_stmt_iterator *gsi_p,
> omp_context *ctx)
> {
> tree type = TREE_TYPE (var);
> tree new_var = lookup_decl (var, ctx);
> - if (omp_is_reference (var))
> + tree opt_arg_label = NULL_TREE;
> +
> + if (omp_is_reference (var) || omp_is_optional_argument (var))
> {
> type = TREE_TYPE (type);
> if (TREE_CODE (type) != ARRAY_TYPE)
> {
> + if (omp_is_optional_argument (var))
> + {
> + tree null_label
> + = create_artificial_label (UNKNOWN_LOCATION);
> + tree notnull_label
> + = create_artificial_label (UNKNOWN_LOCATION);
> + opt_arg_label
> + = create_artificial_label (UNKNOWN_LOCATION);
> + glabel *null_glabel
> + = gimple_build_label (null_label);
> + glabel *notnull_glabel
> + = gimple_build_label (notnull_label);
> + ggoto *opt_arg_ggoto
> + = gimple_build_goto (opt_arg_label);
> + gcond *cond;
> +
> + gimplify_expr (&x, &new_body, NULL, is_gimple_val,
> + fb_rvalue);
> + cond = gimple_build_cond (EQ_EXPR, x,
> + null_pointer_node,
> + null_label,
> + notnull_label);
> + gimple_seq_add_stmt (&new_body, cond);
> + gimple_seq_add_stmt (&new_body, null_glabel);
> + gimplify_assign (new_var, null_pointer_node,
> + &new_body);
> + gimple_seq_add_stmt (&new_body, opt_arg_ggoto);
> + gimple_seq_add_stmt (&new_body, notnull_glabel);
> + }
> +
> tree v = create_tmp_var_raw (type, get_name (var));
> gimple_add_tmp_var (v);
> TREE_ADDRESSABLE (v) = 1;
> @@ -9158,6 +9223,10 @@ lower_omp_target (gimple_stmt_iterator *gsi_p,
> omp_context *ctx)
> gimplify_expr (&x, &new_body, NULL, is_gimple_val, fb_rvalue);
> gimple_seq_add_stmt (&new_body,
> gimple_build_assign (new_var, x));
> +
> + if (opt_arg_label != NULL_TREE)
> + gimple_seq_add_stmt (&new_body,
> + gimple_build_label (opt_arg_label));
> }
> break;
> }
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