Fix oacc kernels default mapping for scalars

2015-12-02  Tom de Vries  <tom@codesourcery.com>

	* gimplify.c (enum gimplify_omp_var_data): Add enum value
	GOVD_MAP_FORCE.
	(oacc_default_clause): Fix default for scalars in oacc kernels.
	(gimplify_adjust_omp_clauses_1): Handle GOVD_MAP_FORCE.

	* c-c++-common/goacc/kernels-default-2.c: New test.
	* c-c++-common/goacc/kernels-default.c: New test.

From-SVN: r231183

gcc/ChangeLog

 2015-12-02  Tom de Vries  <tom@codesourcery.com>
 
+	* gimplify.c (enum gimplify_omp_var_data): Add enum value
+	GOVD_MAP_FORCE.
+	(oacc_default_clause): Fix default for scalars in oacc kernels.
+	(gimplify_adjust_omp_clauses_1): Handle GOVD_MAP_FORCE.
+
+2015-12-02  Tom de Vries  <tom@codesourcery.com>
+
 	* omp-low.c (install_var_field, scan_sharing_clauses): Add and handle
 	parameter base_pointers_restrict.
 	(omp_target_base_pointers_restrict_p): New function.

gcc/gimplify.c

@@ -90,6 +90,9 @@ enum gimplify_omp_var_data
   /* Flag for shared vars that are or might be stored to in the region.  */
   GOVD_WRITTEN = 131072,
 
+  /* Flag for GOVD_MAP, if it is a forced mapping.  */
+  GOVD_MAP_FORCE = 262144,
+
   GOVD_DATA_SHARE_CLASS = (GOVD_SHARED | GOVD_PRIVATE | GOVD_FIRSTPRIVATE
 			   | GOVD_LASTPRIVATE | GOVD_REDUCTION | GOVD_LINEAR
 			   | GOVD_LOCAL)
@@ -5980,8 +5983,12 @@ oacc_default_clause (struct gimplify_omp_ctx *ctx, tree decl, unsigned flags)
       gcc_unreachable ();
 
     case ORT_ACC_KERNELS:
-      /* Everything under kernels are default 'present_or_copy'.  */
+      /* Scalars are default 'copy' under kernels, non-scalars are default
+	 'present_or_copy'.  */
       flags |= GOVD_MAP;
+      if (!AGGREGATE_TYPE_P (TREE_TYPE (decl)))
+	flags |= GOVD_MAP_FORCE;
+
       rkind = "kernels";
       break;
 
@@ -7640,10 +7647,12 @@ gimplify_adjust_omp_clauses_1 (splay_tree_node n, void *data)
     }
   else if (code == OMP_CLAUSE_MAP)
     {
-      OMP_CLAUSE_SET_MAP_KIND (clause,
-			       flags & GOVD_MAP_TO_ONLY
+      int kind = (flags & GOVD_MAP_TO_ONLY
 		  ? GOMP_MAP_TO
 		  : GOMP_MAP_TOFROM);
+      if (flags & GOVD_MAP_FORCE)
+	kind |= GOMP_MAP_FLAG_FORCE;
+      OMP_CLAUSE_SET_MAP_KIND (clause, kind);
       if (DECL_SIZE (decl)
 	  && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
 	{

gcc/testsuite/ChangeLog

 2015-12-02  Tom de Vries  <tom@codesourcery.com>
 
+	* c-c++-common/goacc/kernels-default-2.c: New test.
+	* c-c++-common/goacc/kernels-default.c: New test.
+
+2015-12-02  Tom de Vries  <tom@codesourcery.com>
+
 	* c-c++-common/goacc/kernels-alias-2.c: New test.
 	* c-c++-common/goacc/kernels-alias-3.c: New test.
 	* c-c++-common/goacc/kernels-alias-4.c: New test.

gcc/testsuite/c-c++-common/goacc/kernels-default-2.c

+/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-fdump-tree-gimple" } */
+
+#define N 2
+
+void
+foo (void)
+{
+  unsigned int a[N];
+
+#pragma acc kernels
+  {
+    a[0]++;
+  }
+}
+
+/* { dg-final { scan-tree-dump-times "map\\(tofrom" 1 "gimple" } } */

gcc/testsuite/c-c++-common/goacc/kernels-default.c

+/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-fdump-tree-gimple" } */
+
+void
+foo (void)
+{
+  unsigned int i;
+#pragma acc kernels
+  {
+    i++;
+  }
+}
+
+/* { dg-final { scan-tree-dump-times "map\\(force_tofrom" 1 "gimple" } } */