Use a single worker for OpenACC on AMD GCN

2019-11-13  Andrew Stubbs  <ams@codesourcery.com>
	    Julian Brown  <julian@codesourcery.com>

	gcc/
	* config/gcn/gcn.c (gcn_goacc_validate_dims): Ensure
	flag_worker_partitioning is not set.
	(TARGET_GOACC_WORKER_PARTITIONING): Remove target hook definition.
	* config/gcn/gcn.opt (macc-experimental-workers): Default to off.

Co-Authored-By: Julian Brown <julian@codesourcery.com>

From-SVN: r278137

gcc/ChangeLog

 2019-11-13  Andrew Stubbs  <ams@codesourcery.com>
+	    Julian Brown  <julian@codesourcery.com>
+
+	* config/gcn/gcn.c (gcn_goacc_validate_dims): Ensure
+	flag_worker_partitioning is not set.
+	(TARGET_GOACC_WORKER_PARTITIONING): Remove target hook definition.
+	* config/gcn/gcn.opt (macc-experimental-workers): Default to off.
+
+2019-11-13  Andrew Stubbs  <ams@codesourcery.com>
 
 	* config/gcn/gcn-run.c (heap_region): New global variable.
 	(struct hsa_runtime_fn_info): Add hsa_memory_assign_agent_fn.

gcc/config/gcn/gcn.c

@@ -4695,6 +4695,8 @@ 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.  */
@@ -6073,8 +6075,6 @@ 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

gcc/config/gcn/gcn.opt

@@ -65,7 +65,7 @@ Target Report RejectNegative Var(flag_bypass_init_error)
 bool flag_worker_partitioning = false
 
 macc-experimental-workers
-Target Report Var(flag_worker_partitioning) Init(1)
+Target Report Var(flag_worker_partitioning) Init(0)
 
 int stack_size_opt = -1