re PR middle-end/80853 (OpenMP ICE in build_outer_var_ref with array reduction)

	PR middle-end/80853
	* omp-low.c (lower_reduction_clauses): Pass OMP_CLAUSE_PRIVATE
	as last argument to build_outer_var_ref for pointer bases of array
	section reductions.

	* testsuite/libgomp.c/pr80853.c: New test.

From-SVN: r248344

gcc/ChangeLog

+2017-05-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/80853
+	* omp-low.c (lower_reduction_clauses): Pass OMP_CLAUSE_PRIVATE
+	as last argument to build_outer_var_ref for pointer bases of array
+	section reductions.
+
 2017-05-19  Martin Sebor  <msebor@redhat.com>
 
 	* print-tree.c (print_node): Print DECL_READ_P flag.

gcc/omp-low.c

@@ -5140,15 +5140,25 @@ lower_reduction_clauses (tree clauses, gimple_seq *stmt_seqp, omp_context *ctx)
       if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_REDUCTION)
 	continue;
 
+      enum omp_clause_code ccode = OMP_CLAUSE_REDUCTION;
       orig_var = var = OMP_CLAUSE_DECL (c);
       if (TREE_CODE (var) == MEM_REF)
 	{
 	  var = TREE_OPERAND (var, 0);
 	  if (TREE_CODE (var) == POINTER_PLUS_EXPR)
 	    var = TREE_OPERAND (var, 0);
-	  if (TREE_CODE (var) == INDIRECT_REF
-	      || TREE_CODE (var) == ADDR_EXPR)
+	  if (TREE_CODE (var) == ADDR_EXPR)
 	    var = TREE_OPERAND (var, 0);
+	  else
+	    {
+	      /* If this is a pointer or referenced based array
+		 section, the var could be private in the outer
+		 context e.g. on orphaned loop construct.  Pretend this
+		 is private variable's outer reference.  */
+	      ccode = OMP_CLAUSE_PRIVATE;
+	      if (TREE_CODE (var) == INDIRECT_REF)
+		var = TREE_OPERAND (var, 0);
+	    }
 	  orig_var = var;
 	  if (is_variable_sized (var))
 	    {
@@ -5162,7 +5172,7 @@ lower_reduction_clauses (tree clauses, gimple_seq *stmt_seqp, omp_context *ctx)
       new_var = lookup_decl (var, ctx);
       if (var == OMP_CLAUSE_DECL (c) && omp_is_reference (var))
 	new_var = build_simple_mem_ref_loc (clause_loc, new_var);
-      ref = build_outer_var_ref (var, ctx);
+      ref = build_outer_var_ref (var, ctx, ccode);
       code = OMP_CLAUSE_REDUCTION_CODE (c);
 
       /* reduction(-:var) sums up the partial results, so it acts

libgomp/ChangeLog

+2017-05-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/80853
+	* testsuite/libgomp.c/pr80853.c: New test.
+
 2017-05-19  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* testsuite/libgomp.oacc-c++/template-reduction.C: Update.

libgomp/testsuite/libgomp.c/pr80853.c

+/* PR middle-end/80853 */
+/* { dg-do run } */
+
+__attribute__((noinline, noclone)) void
+foo (int *p)
+{
+  #pragma omp for reduction(+:p[:4])
+  for (int i = 0; i < 64; i++)
+    {
+      p[0] += i;
+      p[1] += i / 2;
+      p[2] += 2 * i;
+      p[3] += 3 * i;
+    }
+}
+
+int
+main ()
+{
+  int p[4] = { 0, 0, 0, 0 };
+  #pragma omp parallel
+  foo (p);
+  if (p[0] != 63 * 64 / 2
+      || p[1] != 31 * 32
+      || p[2] != 63 * 64
+      || p[3] != 3 * 63 * 64 / 2)
+    __builtin_abort ();
+  return 0;
+}