re PR middle-end/78884 ([7/8] ICE when gimplifying VLA in OpenMP SIMD region)

	PR middle-end/78884
	* gimplify.c (struct gimplify_omp_ctx): Add add_safelen1 member.
	(gimplify_bind_expr): If seeing TREE_ADDRESSABLE VLA inside of simd
	loop body, set ctx->add_safelen1 instead of making it GOVD_PRIVATE.
	(gimplify_adjust_omp_clauses): Add safelen (1) clause if
	ctx->add_safelen1 is set.

	* gcc.dg/gomp/pr78884.c: New test.

From-SVN: r273096

gcc/ChangeLog

 2019-07-04  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/78884
+	* gimplify.c (struct gimplify_omp_ctx): Add add_safelen1 member.
+	(gimplify_bind_expr): If seeing TREE_ADDRESSABLE VLA inside of simd
+	loop body, set ctx->add_safelen1 instead of making it GOVD_PRIVATE.
+	(gimplify_adjust_omp_clauses): Add safelen (1) clause if
+	ctx->add_safelen1 is set.
+
 	* omp-expand.c (expand_omp_for_static_nochunk): Don't emit
 	GOMP_loop_start at the start of second worksharing loop in a scan.
 	For nowait, don't emit GOMP_loop_end_nowait at the end of first

gcc/gimplify.c

@@ -221,6 +221,7 @@ struct gimplify_omp_ctx
   bool combined_loop;
   bool distribute;
   bool target_firstprivatize_array_bases;
+  bool add_safelen1;
   int defaultmap[4];
 };
 
@@ -1331,12 +1332,17 @@ gimplify_bind_expr (tree *expr_p, gimple_seq *pre_p)
 		  || splay_tree_lookup (ctx->variables,
 					(splay_tree_key) t) == NULL)
 		{
+		  int flag = GOVD_LOCAL;
 		  if (ctx->region_type == ORT_SIMD
 		      && TREE_ADDRESSABLE (t)
 		      && !TREE_STATIC (t))
-		    omp_add_variable (ctx, t, GOVD_PRIVATE | GOVD_SEEN);
-		  else
-		    omp_add_variable (ctx, t, GOVD_LOCAL | GOVD_SEEN);
+		    {
+		      if (TREE_CODE (DECL_SIZE_UNIT (t)) != INTEGER_CST)
+			ctx->add_safelen1 = true;
+		      else
+			flag = GOVD_PRIVATE;
+		    }
+		  omp_add_variable (ctx, t, flag | GOVD_SEEN);
 		}
 	      /* Static locals inside of target construct or offloaded
 		 routines need to be "omp declare target".  */
@@ -9801,6 +9807,18 @@ gimplify_adjust_omp_clauses (gimple_seq *pre_p, gimple_seq body, tree *list_p,
 	}
     }
 
+  if (ctx->add_safelen1)
+    {
+      /* If there are VLAs in the body of simd loop, prevent
+	 vectorization.  */
+      gcc_assert (ctx->region_type == ORT_SIMD);
+      c = build_omp_clause (UNKNOWN_LOCATION, OMP_CLAUSE_SAFELEN);
+      OMP_CLAUSE_SAFELEN_EXPR (c) = integer_one_node;
+      OMP_CLAUSE_CHAIN (c) = *list_p;
+      *list_p = c;
+      list_p = &OMP_CLAUSE_CHAIN (c);
+    }
+
   if (ctx->region_type == ORT_WORKSHARE
       && ctx->outer_context
       && ctx->outer_context->region_type == ORT_COMBINED_PARALLEL)

gcc/testsuite/ChangeLog

+2019-07-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/78884
+	* gcc.dg/gomp/pr78884.c: New test.
+
 2019-07-04  Andrea Corallo <andrea.corallo@arm.com>
 
 	* jit.dg/test-error-gcc_jit_context_new_binary_op-bad-res-type.c:

gcc/testsuite/gcc.dg/gomp/pr78884.c

+/* PR middle-end/78884 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fopenmp" } */
+
+void bar (int *);
+
+void
+foo (int n)
+{
+#pragma omp simd
+  for (int i = 0; i < 1024; i++)
+    {
+      int vla[n];
+      bar (vla);
+    }
+}