[gcc/devel/omp/gcc-10] Enable worker partitioning for AMD GCN

[Kwok Yeung]

https://gcc.gnu.org/g:d5db8d5fe9f1f6e32313b26304dc3c12112bf367

commit d5db8d5fe9f1f6e32313b26304dc3c12112bf367
Author: Julian Brown <julian@codesourcery.com>
Date:   Tue Sep 3 08:57:39 2019 -0700

    Enable worker partitioning for AMD GCN
    
            gcc/
            * config/gcn/gcn.c (gcn_goacc_validate_dims): Remove
            no-flag_worker-partitioning assertion.
            (TARGET_GOACC_WORKER_PARTITIONING): Define target hook to true.
            * config/gcn/gcn.opt (flag_worker_partitioning): Change default to 1.
    
            libgomp/
            * plugin/plugin-gcn.c (gcn_exec): Change default number of workers to
            16.

Diff:
---
 gcc/ChangeLog.omp           | 7 +++++++
 gcc/config/gcn/gcn.c        | 4 ++--
 gcc/config/gcn/gcn.opt      | 2 +-
 libgomp/ChangeLog.omp       | 5 +++++
 libgomp/plugin/plugin-gcn.c | 4 +---
 5 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/gcc/ChangeLog.omp b/gcc/ChangeLog.omp
index 411ecfe7108..8cb3f8e7721 100644
--- a/gcc/ChangeLog.omp
+++ b/gcc/ChangeLog.omp
@@ -1,3 +1,10 @@
+2019-09-05  Julian Brown  <julian@codesourcery.com>
+
+	* config/gcn/gcn.c (gcn_goacc_validate_dims): Remove
+	no-flag_worker-partitioning assertion.
+	(TARGET_GOACC_WORKER_PARTITIONING): Define target hook to true.
+	* config/gcn/gcn.opt (flag_worker_partitioning): Change default to 1.
+
 2019-09-05  Cesar Philippidis  <cesar@codesourcery.com>
 	    Julian Brown  <julian@codesourcery.com>
 
diff --git a/gcc/config/gcn/gcn.c b/gcc/config/gcn/gcn.c
index d315abeb84b..4ffbe058644 100644
--- a/gcc/config/gcn/gcn.c
+++ b/gcc/config/gcn/gcn.c
@@ -4784,8 +4784,6 @@ gcn_goacc_validate_dims (tree decl, int dims[], int fn_level,
   /* FIXME: remove -facc-experimental-workers when they're ready.  */
   int max_workers = flag_worker_partitioning ? 16 : 1;
 
-  gcc_assert (!flag_worker_partitioning);
-
   /* The vector size must appear to be 64, to the user, unless this is a
      SEQ routine.  The real, internal value is always 1, which means use
      autovectorization, but the user should not see that.  */
@@ -6212,6 +6210,8 @@ print_operand (FILE *file, rtx x, int code)
 #define TARGET_GOACC_REDUCTION gcn_goacc_reduction
 #undef  TARGET_GOACC_VALIDATE_DIMS
 #define TARGET_GOACC_VALIDATE_DIMS gcn_goacc_validate_dims
+#undef  TARGET_GOACC_WORKER_PARTITIONING
+#define TARGET_GOACC_WORKER_PARTITIONING true
 #undef  TARGET_HARD_REGNO_MODE_OK
 #define TARGET_HARD_REGNO_MODE_OK gcn_hard_regno_mode_ok
 #undef  TARGET_HARD_REGNO_NREGS
diff --git a/gcc/config/gcn/gcn.opt b/gcc/config/gcn/gcn.opt
index 04c73d64630..83158c46701 100644
--- a/gcc/config/gcn/gcn.opt
+++ b/gcc/config/gcn/gcn.opt
@@ -62,7 +62,7 @@ Target Report RejectNegative Var(flag_bypass_init_error)
 bool flag_worker_partitioning = false
 
 macc-experimental-workers
-Target Report Var(flag_worker_partitioning) Init(0)
+Target Report Var(flag_worker_partitioning) Init(1)
 
 int stack_size_opt = -1
 
diff --git a/libgomp/ChangeLog.omp b/libgomp/ChangeLog.omp
index 98173e5a66c..9d54c44c847 100644
--- a/libgomp/ChangeLog.omp
+++ b/libgomp/ChangeLog.omp
@@ -1,3 +1,8 @@
+2019-09-05  Julian Brown  <julian@codesourcery.com>
+
+	* plugin/plugin-gcn.c (gcn_exec): Change default number of workers to
+	16.
+
 2019-09-05  Julian Brown  <julian@codesourcery.com>
 
 	* testsuite/libgomp.oacc-fortran/lib-13.f90: End data region after
diff --git a/libgomp/plugin/plugin-gcn.c b/libgomp/plugin/plugin-gcn.c
index ef98d75e4b2..122cf7ce74f 100644
--- a/libgomp/plugin/plugin-gcn.c
+++ b/libgomp/plugin/plugin-gcn.c
@@ -3262,10 +3262,8 @@ gcn_exec (struct kernel_info *kernel, size_t mapnum, void **hostaddrs,
      problem size, so let's do a reasonable number of single-worker gangs.
      64 gangs matches a typical Fiji device.  */
 
-  /* NOTE: Until support for middle-end worker partitioning is merged, use 1
-     for the default number of workers.  */
   if (dims[0] == 0) dims[0] = get_cu_count (kernel->agent); /* Gangs.  */
-  if (dims[1] == 0) dims[1] = 1;  /* Workers.  */
+  if (dims[1] == 0) dims[1] = 16; /* Workers.  */
 
   /* The incoming dimensions are expressed in terms of gangs, workers, and
      vectors.  The HSA dimensions are expressed in terms of "work-items",