tree-ssa-alias.c (nonoverlapping_component_refs_p): Also truncate access path on BIT_FIELD_REFs.

	* tree-ssa-alias.c (nonoverlapping_component_refs_p): Also truncate
	access path on BIT_FIELD_REFs.

From-SVN: r272380

gcc/ChangeLog

+2019-06-17  Jan Hubicka  <hubicka@ucw.cz>
+
+	* tree-ssa-alias.c (nonoverlapping_component_refs_p): Also truncate
+	access path on BIT_FIELD_REFs.
+
 2019-06-17  Martin Liska  <mliska@suse.cz>
 
 	PR ipa/90874

gcc/tree-ssa-alias.c

@@ -1268,7 +1268,8 @@ nonoverlapping_component_refs_p (const_tree x, const_tree y)
 	  if (TREE_CODE (type) == RECORD_TYPE)
 	    fieldsx.safe_push (field);
 	}
-      else if (TREE_CODE (x) == VIEW_CONVERT_EXPR)
+      else if (TREE_CODE (x) == VIEW_CONVERT_EXPR
+	       || TREE_CODE (x) == BIT_FIELD_REF)
 	fieldsx.truncate (0);
       x = TREE_OPERAND (x, 0);
     }
@@ -1284,7 +1285,8 @@ nonoverlapping_component_refs_p (const_tree x, const_tree y)
 	  if (TREE_CODE (type) == RECORD_TYPE)
 	    fieldsy.safe_push (TREE_OPERAND (y, 1));
 	}
-      else if (TREE_CODE (y) == VIEW_CONVERT_EXPR)
+      else if (TREE_CODE (y) == VIEW_CONVERT_EXPR
+	       || TREE_CODE (y) == BIT_FIELD_REF)
 	fieldsy.truncate (0);
       y = TREE_OPERAND (y, 0);
     }