Hi!
On 2020-06-29T13:16:51-0700, Julian Brown <jul...@codesourcery.com> wrote:
> This patch turns off the middle-end worker-partitioning support if the
> number of workers for an outlined offload function is one. In that case,
> we do not need to perform the broadcasting/neutering code transformation.
ACK, thanks.
> --- a/gcc/omp-offload.c
> +++ b/gcc/omp-offload.c
> @@ -2165,7 +2165,20 @@ public:
> /* opt_pass methods: */
> virtual bool gate (function *)
> {
> - return flag_openacc && targetm.goacc.worker_partitioning;
> + if (!flag_openacc || !targetm.goacc.worker_partitioning)
> + return false;
> +
> + tree attr = oacc_get_fn_attrib (current_function_decl);
> +
> + if (!attr)
> + /* Not an offloaded function. */
> + return false;
This last check implies that code in
'gcc/omp-oacc-neuter-broadcast.cc:execute_omp_oacc_neuter_broadcast'
ought to be simplified which currently does:
tree attr = oacc_get_fn_attrib (current_function_decl);
if (attr)
..., which now is always-true.
> +
> + int worker_dim
> + = oacc_get_fn_dim_size (current_function_decl, GOMP_DIM_WORKER);
> +
> + /* No worker partitioning if we know the number of workers is 1. */
> + return worker_dim != 1;
> };
Pushed to master branch commit 82792cc407d7a7ab99f37e8501d19be2e6164e50
"openacc: Turn off worker partitioning if num_workers==1", see attached.
Grüße
Thomas
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>From 82792cc407d7a7ab99f37e8501d19be2e6164e50 Mon Sep 17 00:00:00 2001
From: Julian Brown <jul...@codesourcery.com>
Date: Mon, 29 Jun 2020 13:16:51 -0700
Subject: [PATCH] openacc: Turn off worker partitioning if num_workers==1
This patch turns off the middle-end worker-partitioning support if the
number of workers for an outlined offload function is one. In that case,
we do not need to perform the broadcasting/neutering code transformation.
gcc/
* omp-oacc-neuter-broadcast.cc
(pass_omp_oacc_neuter_broadcast::gate): Disable if num_workers is
1.
(execute_omp_oacc_neuter_broadcast): Adjust.
Co-Authored-By: Thomas Schwinge <tho...@codesourcery.com>
---
gcc/omp-oacc-neuter-broadcast.cc | 47 +++++++++++++++++++++-----------
1 file changed, 31 insertions(+), 16 deletions(-)
diff --git a/gcc/omp-oacc-neuter-broadcast.cc b/gcc/omp-oacc-neuter-broadcast.cc
index d48627a6940..3fe92248c4e 100644
--- a/gcc/omp-oacc-neuter-broadcast.cc
+++ b/gcc/omp-oacc-neuter-broadcast.cc
@@ -1378,18 +1378,17 @@ execute_omp_oacc_neuter_broadcast ()
/* If this is a routine, calculate MASK as if the outer levels are already
partitioned. */
- tree attr = oacc_get_fn_attrib (current_function_decl);
- if (attr)
- {
- tree dims = TREE_VALUE (attr);
- unsigned ix;
- for (ix = 0; ix != GOMP_DIM_MAX; ix++, dims = TREE_CHAIN (dims))
- {
- tree allowed = TREE_PURPOSE (dims);
- if (allowed && integer_zerop (allowed))
- mask |= GOMP_DIM_MASK (ix);
- }
- }
+ {
+ tree attr = oacc_get_fn_attrib (current_function_decl);
+ tree dims = TREE_VALUE (attr);
+ unsigned ix;
+ for (ix = 0; ix != GOMP_DIM_MAX; ix++, dims = TREE_CHAIN (dims))
+ {
+ tree allowed = TREE_PURPOSE (dims);
+ if (allowed && integer_zerop (allowed))
+ mask |= GOMP_DIM_MASK (ix);
+ }
+ }
parallel_g *par = omp_sese_discover_pars (&bb_stmt_map);
populate_single_mode_bitmaps (par, worker_single, vector_single, mask, 0);
@@ -1506,11 +1505,27 @@ public:
{}
/* opt_pass methods: */
- virtual bool gate (function *)
+ virtual bool gate (function *fun)
{
- return (flag_openacc
- && targetm.goacc.create_worker_broadcast_record);
- };
+ if (!flag_openacc)
+ return false;
+
+ if (!targetm.goacc.create_worker_broadcast_record)
+ return false;
+
+ /* Only relevant for OpenACC offloaded functions. */
+ tree attr = oacc_get_fn_attrib (fun->decl);
+ if (!attr)
+ return false;
+
+ /* Not relevant for 'num_workers(1)'. */
+ int worker_dim
+ = oacc_get_fn_dim_size (fun->decl, GOMP_DIM_WORKER);
+ if (worker_dim == 1)
+ return false;
+
+ return true;
+ }
virtual unsigned int execute (function *)
{
--
2.33.0
